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1 #!/usr/bin/perl -w
2 # (c) 2001, Dave Jones. (the file handling bit)
3 # (c) 2005, Joel Schopp <jschopp@austin.ibm.com> (the ugly bit)
4 # (c) 2007,2008, Andy Whitcroft <apw@uk.ibm.com> (new conditions, test suite)
5 # (c) 2008-2010 Andy Whitcroft <apw@canonical.com>
6 # Licensed under the terms of the GNU GPL License version 2
7
8 use strict;
9
10 my $P = $0;
11 $P =~ s@.*/@@g;
12
13 my $V = '0.32';
14
15 use Getopt::Long qw(:config no_auto_abbrev);
16
17 my $quiet = 0;
18 my $tree = 1;
19 my $chk_signoff = 1;
20 my $chk_patch = 1;
21 my $tst_only;
22 my $emacs = 0;
23 my $terse = 0;
24 my $file = 0;
25 my $check = 0;
26 my $summary = 1;
27 my $mailback = 0;
28 my $summary_file = 0;
29 my $show_types = 0;
30 my $root;
31 my %debug;
32 my %ignore_type = ();
33 my @ignore = ();
34 my $help = 0;
35 my $configuration_file = ".checkpatch.conf";
36
37 sub help {
38         my ($exitcode) = @_;
39
40         print << "EOM";
41 Usage: $P [OPTION]... [FILE]...
42 Version: $V
43
44 Options:
45   -q, --quiet                quiet
46   --no-tree                  run without a kernel tree
47   --no-signoff               do not check for 'Signed-off-by' line
48   --patch                    treat FILE as patchfile (default)
49   --emacs                    emacs compile window format
50   --terse                    one line per report
51   -f, --file                 treat FILE as regular source file
52   --subjective, --strict     enable more subjective tests
53   --ignore TYPE(,TYPE2...)   ignore various comma separated message types
54   --show-types               show the message "types" in the output
55   --root=PATH                PATH to the kernel tree root
56   --no-summary               suppress the per-file summary
57   --mailback                 only produce a report in case of warnings/errors
58   --summary-file             include the filename in summary
59   --debug KEY=[0|1]          turn on/off debugging of KEY, where KEY is one of
60                              'values', 'possible', 'type', and 'attr' (default
61                              is all off)
62   --test-only=WORD           report only warnings/errors containing WORD
63                              literally
64   -h, --help, --version      display this help and exit
65
66 When FILE is - read standard input.
67 EOM
68
69         exit($exitcode);
70 }
71
72 my $conf = which_conf($configuration_file);
73 if (-f $conf) {
74         my @conf_args;
75         open(my $conffile, '<', "$conf")
76             or warn "$P: Can't find a readable $configuration_file file $!\n";
77
78         while (<$conffile>) {
79                 my $line = $_;
80
81                 $line =~ s/\s*\n?$//g;
82                 $line =~ s/^\s*//g;
83                 $line =~ s/\s+/ /g;
84
85                 next if ($line =~ m/^\s*#/);
86                 next if ($line =~ m/^\s*$/);
87
88                 my @words = split(" ", $line);
89                 foreach my $word (@words) {
90                         last if ($word =~ m/^#/);
91                         push (@conf_args, $word);
92                 }
93         }
94         close($conffile);
95         unshift(@ARGV, @conf_args) if @conf_args;
96 }
97
98 GetOptions(
99         'q|quiet+'      => \$quiet,
100         'tree!'         => \$tree,
101         'signoff!'      => \$chk_signoff,
102         'patch!'        => \$chk_patch,
103         'emacs!'        => \$emacs,
104         'terse!'        => \$terse,
105         'f|file!'       => \$file,
106         'subjective!'   => \$check,
107         'strict!'       => \$check,
108         'ignore=s'      => \@ignore,
109         'show-types!'   => \$show_types,
110         'root=s'        => \$root,
111         'summary!'      => \$summary,
112         'mailback!'     => \$mailback,
113         'summary-file!' => \$summary_file,
114
115         'debug=s'       => \%debug,
116         'test-only=s'   => \$tst_only,
117         'h|help'        => \$help,
118         'version'       => \$help
119 ) or help(1);
120
121 help(0) if ($help);
122
123 my $exit = 0;
124
125 if ($#ARGV < 0) {
126         print "$P: no input files\n";
127         exit(1);
128 }
129
130 @ignore = split(/,/, join(',',@ignore));
131 foreach my $word (@ignore) {
132         $word =~ s/\s*\n?$//g;
133         $word =~ s/^\s*//g;
134         $word =~ s/\s+/ /g;
135         $word =~ tr/[a-z]/[A-Z]/;
136
137         next if ($word =~ m/^\s*#/);
138         next if ($word =~ m/^\s*$/);
139
140         $ignore_type{$word}++;
141 }
142
143 my $dbg_values = 0;
144 my $dbg_possible = 0;
145 my $dbg_type = 0;
146 my $dbg_attr = 0;
147 for my $key (keys %debug) {
148         ## no critic
149         eval "\${dbg_$key} = '$debug{$key}';";
150         die "$@" if ($@);
151 }
152
153 my $rpt_cleaners = 0;
154
155 if ($terse) {
156         $emacs = 1;
157         $quiet++;
158 }
159
160 if ($tree) {
161         if (defined $root) {
162                 if (!top_of_kernel_tree($root)) {
163                         die "$P: $root: --root does not point at a valid tree\n";
164                 }
165         } else {
166                 if (top_of_kernel_tree('.')) {
167                         $root = '.';
168                 } elsif ($0 =~ m@(.*)/scripts/[^/]*$@ &&
169                                                 top_of_kernel_tree($1)) {
170                         $root = $1;
171                 }
172         }
173
174         if (!defined $root) {
175                 print "Must be run from the top-level dir. of a kernel tree\n";
176                 exit(2);
177         }
178 }
179
180 my $emitted_corrupt = 0;
181
182 our $Ident      = qr{
183                         [A-Za-z_][A-Za-z\d_]*
184                         (?:\s*\#\#\s*[A-Za-z_][A-Za-z\d_]*)*
185                 }x;
186 our $Storage    = qr{extern|static|asmlinkage};
187 our $Sparse     = qr{
188                         __user|
189                         __kernel|
190                         __force|
191                         __iomem|
192                         __must_check|
193                         __init_refok|
194                         __kprobes|
195                         __ref|
196                         __rcu
197                 }x;
198
199 # Notes to $Attribute:
200 # We need \b after 'init' otherwise 'initconst' will cause a false positive in a check
201 our $Attribute  = qr{
202                         const|
203                         __percpu|
204                         __nocast|
205                         __safe|
206                         __bitwise__|
207                         __packed__|
208                         __packed2__|
209                         __naked|
210                         __maybe_unused|
211                         __always_unused|
212                         __noreturn|
213                         __used|
214                         __cold|
215                         __noclone|
216                         __deprecated|
217                         __read_mostly|
218                         __kprobes|
219                         __(?:mem|cpu|dev|)(?:initdata|initconst|init\b)|
220                         ____cacheline_aligned|
221                         ____cacheline_aligned_in_smp|
222                         ____cacheline_internodealigned_in_smp|
223                         __weak
224                   }x;
225 our $Modifier;
226 our $Inline     = qr{inline|__always_inline|noinline};
227 our $Member     = qr{->$Ident|\.$Ident|\[[^]]*\]};
228 our $Lval       = qr{$Ident(?:$Member)*};
229
230 our $Constant   = qr{(?i:(?:[0-9]+|0x[0-9a-f]+)[ul]*)};
231 our $Assignment = qr{(?:\*\=|/=|%=|\+=|-=|<<=|>>=|&=|\^=|\|=|=)};
232 our $Compare    = qr{<=|>=|==|!=|<|>};
233 our $Operators  = qr{
234                         <=|>=|==|!=|
235                         =>|->|<<|>>|<|>|!|~|
236                         &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%
237                   }x;
238
239 our $NonptrType;
240 our $Type;
241 our $Declare;
242
243 our $NON_ASCII_UTF8     = qr{
244         [\xC2-\xDF][\x80-\xBF]               # non-overlong 2-byte
245         |  \xE0[\xA0-\xBF][\x80-\xBF]        # excluding overlongs
246         | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
247         |  \xED[\x80-\x9F][\x80-\xBF]        # excluding surrogates
248         |  \xF0[\x90-\xBF][\x80-\xBF]{2}     # planes 1-3
249         | [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
250         |  \xF4[\x80-\x8F][\x80-\xBF]{2}     # plane 16
251 }x;
252
253 our $UTF8       = qr{
254         [\x09\x0A\x0D\x20-\x7E]              # ASCII
255         | $NON_ASCII_UTF8
256 }x;
257
258 our $typeTypedefs = qr{(?x:
259         (?:__)?(?:u|s|be|le)(?:8|16|32|64)|
260         atomic_t
261 )};
262
263 our $logFunctions = qr{(?x:
264         printk(?:_ratelimited|_once|)|
265         [a-z0-9]+_(?:printk|emerg|alert|crit|err|warning|warn|notice|info|debug|dbg|vdbg|devel|cont|WARN)(?:_ratelimited|_once|)|
266         WARN(?:_RATELIMIT|_ONCE|)|
267         panic|
268         MODULE_[A-Z_]+
269 )};
270
271 our $signature_tags = qr{(?xi:
272         Signed-off-by:|
273         Acked-by:|
274         Tested-by:|
275         Reviewed-by:|
276         Reported-by:|
277         To:|
278         Cc:
279 )};
280
281 our @typeList = (
282         qr{void},
283         qr{(?:unsigned\s+)?char},
284         qr{(?:unsigned\s+)?short},
285         qr{(?:unsigned\s+)?int},
286         qr{(?:unsigned\s+)?long},
287         qr{(?:unsigned\s+)?long\s+int},
288         qr{(?:unsigned\s+)?long\s+long},
289         qr{(?:unsigned\s+)?long\s+long\s+int},
290         qr{unsigned},
291         qr{float},
292         qr{double},
293         qr{bool},
294         qr{struct\s+$Ident},
295         qr{union\s+$Ident},
296         qr{enum\s+$Ident},
297         qr{${Ident}_t},
298         qr{${Ident}_handler},
299         qr{${Ident}_handler_fn},
300 );
301 our @modifierList = (
302         qr{fastcall},
303 );
304
305 our $allowed_asm_includes = qr{(?x:
306         irq|
307         memory
308 )};
309 # memory.h: ARM has a custom one
310
311 sub build_types {
312         my $mods = "(?x:  \n" . join("|\n  ", @modifierList) . "\n)";
313         my $all = "(?x:  \n" . join("|\n  ", @typeList) . "\n)";
314         $Modifier       = qr{(?:$Attribute|$Sparse|$mods)};
315         $NonptrType     = qr{
316                         (?:$Modifier\s+|const\s+)*
317                         (?:
318                                 (?:typeof|__typeof__)\s*\(\s*\**\s*$Ident\s*\)|
319                                 (?:$typeTypedefs\b)|
320                                 (?:${all}\b)
321                         )
322                         (?:\s+$Modifier|\s+const)*
323                   }x;
324         $Type   = qr{
325                         $NonptrType
326                         (?:[\s\*]+\s*const|[\s\*]+|(?:\s*\[\s*\])+)?
327                         (?:\s+$Inline|\s+$Modifier)*
328                   }x;
329         $Declare        = qr{(?:$Storage\s+)?$Type};
330 }
331 build_types();
332
333 our $match_balanced_parentheses = qr/(\((?:[^\(\)]+|(-1))*\))/;
334
335 our $Typecast   = qr{\s*(\(\s*$NonptrType\s*\)){0,1}\s*};
336 our $LvalOrFunc = qr{($Lval)\s*($match_balanced_parentheses{0,1})\s*};
337 our $FuncArg = qr{$Typecast{0,1}($LvalOrFunc|$Constant)};
338
339 sub deparenthesize {
340         my ($string) = @_;
341         return "" if (!defined($string));
342         $string =~ s@^\s*\(\s*@@g;
343         $string =~ s@\s*\)\s*$@@g;
344         $string =~ s@\s+@ @g;
345         return $string;
346 }
347
348 $chk_signoff = 0 if ($file);
349
350 my @dep_includes = ();
351 my @dep_functions = ();
352 my $removal = "Documentation/feature-removal-schedule.txt";
353 if ($tree && -f "$root/$removal") {
354         open(my $REMOVE, '<', "$root/$removal") ||
355                                 die "$P: $removal: open failed - $!\n";
356         while (<$REMOVE>) {
357                 if (/^Check:\s+(.*\S)/) {
358                         for my $entry (split(/[, ]+/, $1)) {
359                                 if ($entry =~ m@include/(.*)@) {
360                                         push(@dep_includes, $1);
361
362                                 } elsif ($entry !~ m@/@) {
363                                         push(@dep_functions, $entry);
364                                 }
365                         }
366                 }
367         }
368         close($REMOVE);
369 }
370
371 my @rawlines = ();
372 my @lines = ();
373 my $vname;
374 for my $filename (@ARGV) {
375         my $FILE;
376         if ($file) {
377                 open($FILE, '-|', "diff -u /dev/null $filename") ||
378                         die "$P: $filename: diff failed - $!\n";
379         } elsif ($filename eq '-') {
380                 open($FILE, '<&STDIN');
381         } else {
382                 open($FILE, '<', "$filename") ||
383                         die "$P: $filename: open failed - $!\n";
384         }
385         if ($filename eq '-') {
386                 $vname = 'Your patch';
387         } else {
388                 $vname = $filename;
389         }
390         while (<$FILE>) {
391                 chomp;
392                 push(@rawlines, $_);
393         }
394         close($FILE);
395         if (!process($filename)) {
396                 $exit = 1;
397         }
398         @rawlines = ();
399         @lines = ();
400 }
401
402 exit($exit);
403
404 sub top_of_kernel_tree {
405         my ($root) = @_;
406
407         my @tree_check = (
408                 "COPYING", "CREDITS", "Kbuild", "MAINTAINERS", "Makefile",
409                 "README", "Documentation", "arch", "include", "drivers",
410                 "fs", "init", "ipc", "kernel", "lib", "scripts",
411         );
412
413         foreach my $check (@tree_check) {
414                 if (! -e $root . '/' . $check) {
415                         return 0;
416                 }
417         }
418         return 1;
419     }
420
421 sub parse_email {
422         my ($formatted_email) = @_;
423
424         my $name = "";
425         my $address = "";
426         my $comment = "";
427
428         if ($formatted_email =~ /^(.*)<(\S+\@\S+)>(.*)$/) {
429                 $name = $1;
430                 $address = $2;
431                 $comment = $3 if defined $3;
432         } elsif ($formatted_email =~ /^\s*<(\S+\@\S+)>(.*)$/) {
433                 $address = $1;
434                 $comment = $2 if defined $2;
435         } elsif ($formatted_email =~ /(\S+\@\S+)(.*)$/) {
436                 $address = $1;
437                 $comment = $2 if defined $2;
438                 $formatted_email =~ s/$address.*$//;
439                 $name = $formatted_email;
440                 $name =~ s/^\s+|\s+$//g;
441                 $name =~ s/^\"|\"$//g;
442                 # If there's a name left after stripping spaces and
443                 # leading quotes, and the address doesn't have both
444                 # leading and trailing angle brackets, the address
445                 # is invalid. ie:
446                 #   "joe smith joe@smith.com" bad
447                 #   "joe smith <joe@smith.com" bad
448                 if ($name ne "" && $address !~ /^<[^>]+>$/) {
449                         $name = "";
450                         $address = "";
451                         $comment = "";
452                 }
453         }
454
455         $name =~ s/^\s+|\s+$//g;
456         $name =~ s/^\"|\"$//g;
457         $address =~ s/^\s+|\s+$//g;
458         $address =~ s/^\<|\>$//g;
459
460         if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
461                 $name =~ s/(?<!\\)"/\\"/g; ##escape quotes
462                 $name = "\"$name\"";
463         }
464
465         return ($name, $address, $comment);
466 }
467
468 sub format_email {
469         my ($name, $address) = @_;
470
471         my $formatted_email;
472
473         $name =~ s/^\s+|\s+$//g;
474         $name =~ s/^\"|\"$//g;
475         $address =~ s/^\s+|\s+$//g;
476
477         if ($name =~ /[^\w \-]/i) { ##has "must quote" chars
478                 $name =~ s/(?<!\\)"/\\"/g; ##escape quotes
479                 $name = "\"$name\"";
480         }
481
482         if ("$name" eq "") {
483                 $formatted_email = "$address";
484         } else {
485                 $formatted_email = "$name <$address>";
486         }
487
488         return $formatted_email;
489 }
490
491 sub which_conf {
492         my ($conf) = @_;
493
494         foreach my $path (split(/:/, ".:$ENV{HOME}:.scripts")) {
495                 if (-e "$path/$conf") {
496                         return "$path/$conf";
497                 }
498         }
499
500         return "";
501 }
502
503 sub expand_tabs {
504         my ($str) = @_;
505
506         my $res = '';
507         my $n = 0;
508         for my $c (split(//, $str)) {
509                 if ($c eq "\t") {
510                         $res .= ' ';
511                         $n++;
512                         for (; ($n % 8) != 0; $n++) {
513                                 $res .= ' ';
514                         }
515                         next;
516                 }
517                 $res .= $c;
518                 $n++;
519         }
520
521         return $res;
522 }
523 sub copy_spacing {
524         (my $res = shift) =~ tr/\t/ /c;
525         return $res;
526 }
527
528 sub line_stats {
529         my ($line) = @_;
530
531         # Drop the diff line leader and expand tabs
532         $line =~ s/^.//;
533         $line = expand_tabs($line);
534
535         # Pick the indent from the front of the line.
536         my ($white) = ($line =~ /^(\s*)/);
537
538         return (length($line), length($white));
539 }
540
541 my $sanitise_quote = '';
542
543 sub sanitise_line_reset {
544         my ($in_comment) = @_;
545
546         if ($in_comment) {
547                 $sanitise_quote = '*/';
548         } else {
549                 $sanitise_quote = '';
550         }
551 }
552 sub sanitise_line {
553         my ($line) = @_;
554
555         my $res = '';
556         my $l = '';
557
558         my $qlen = 0;
559         my $off = 0;
560         my $c;
561
562         # Always copy over the diff marker.
563         $res = substr($line, 0, 1);
564
565         for ($off = 1; $off < length($line); $off++) {
566                 $c = substr($line, $off, 1);
567
568                 # Comments we are wacking completly including the begin
569                 # and end, all to $;.
570                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '/*') {
571                         $sanitise_quote = '*/';
572
573                         substr($res, $off, 2, "$;$;");
574                         $off++;
575                         next;
576                 }
577                 if ($sanitise_quote eq '*/' && substr($line, $off, 2) eq '*/') {
578                         $sanitise_quote = '';
579                         substr($res, $off, 2, "$;$;");
580                         $off++;
581                         next;
582                 }
583                 if ($sanitise_quote eq '' && substr($line, $off, 2) eq '//') {
584                         $sanitise_quote = '//';
585
586                         substr($res, $off, 2, $sanitise_quote);
587                         $off++;
588                         next;
589                 }
590
591                 # A \ in a string means ignore the next character.
592                 if (($sanitise_quote eq "'" || $sanitise_quote eq '"') &&
593                     $c eq "\\") {
594                         substr($res, $off, 2, 'XX');
595                         $off++;
596                         next;
597                 }
598                 # Regular quotes.
599                 if ($c eq "'" || $c eq '"') {
600                         if ($sanitise_quote eq '') {
601                                 $sanitise_quote = $c;
602
603                                 substr($res, $off, 1, $c);
604                                 next;
605                         } elsif ($sanitise_quote eq $c) {
606                                 $sanitise_quote = '';
607                         }
608                 }
609
610                 #print "c<$c> SQ<$sanitise_quote>\n";
611                 if ($off != 0 && $sanitise_quote eq '*/' && $c ne "\t") {
612                         substr($res, $off, 1, $;);
613                 } elsif ($off != 0 && $sanitise_quote eq '//' && $c ne "\t") {
614                         substr($res, $off, 1, $;);
615                 } elsif ($off != 0 && $sanitise_quote && $c ne "\t") {
616                         substr($res, $off, 1, 'X');
617                 } else {
618                         substr($res, $off, 1, $c);
619                 }
620         }
621
622         if ($sanitise_quote eq '//') {
623                 $sanitise_quote = '';
624         }
625
626         # The pathname on a #include may be surrounded by '<' and '>'.
627         if ($res =~ /^.\s*\#\s*include\s+\<(.*)\>/) {
628                 my $clean = 'X' x length($1);
629                 $res =~ s@\<.*\>@<$clean>@;
630
631         # The whole of a #error is a string.
632         } elsif ($res =~ /^.\s*\#\s*(?:error|warning)\s+(.*)\b/) {
633                 my $clean = 'X' x length($1);
634                 $res =~ s@(\#\s*(?:error|warning)\s+).*@$1$clean@;
635         }
636
637         return $res;
638 }
639
640 sub ctx_statement_block {
641         my ($linenr, $remain, $off) = @_;
642         my $line = $linenr - 1;
643         my $blk = '';
644         my $soff = $off;
645         my $coff = $off - 1;
646         my $coff_set = 0;
647
648         my $loff = 0;
649
650         my $type = '';
651         my $level = 0;
652         my @stack = ();
653         my $p;
654         my $c;
655         my $len = 0;
656
657         my $remainder;
658         while (1) {
659                 @stack = (['', 0]) if ($#stack == -1);
660
661                 #warn "CSB: blk<$blk> remain<$remain>\n";
662                 # If we are about to drop off the end, pull in more
663                 # context.
664                 if ($off >= $len) {
665                         for (; $remain > 0; $line++) {
666                                 last if (!defined $lines[$line]);
667                                 next if ($lines[$line] =~ /^-/);
668                                 $remain--;
669                                 $loff = $len;
670                                 $blk .= $lines[$line] . "\n";
671                                 $len = length($blk);
672                                 $line++;
673                                 last;
674                         }
675                         # Bail if there is no further context.
676                         #warn "CSB: blk<$blk> off<$off> len<$len>\n";
677                         if ($off >= $len) {
678                                 last;
679                         }
680                         if ($level == 0 && substr($blk, $off) =~ /^.\s*#\s*define/) {
681                                 $level++;
682                                 $type = '#';
683                         }
684                 }
685                 $p = $c;
686                 $c = substr($blk, $off, 1);
687                 $remainder = substr($blk, $off);
688
689                 #warn "CSB: c<$c> type<$type> level<$level> remainder<$remainder> coff_set<$coff_set>\n";
690
691                 # Handle nested #if/#else.
692                 if ($remainder =~ /^#\s*(?:ifndef|ifdef|if)\s/) {
693                         push(@stack, [ $type, $level ]);
694                 } elsif ($remainder =~ /^#\s*(?:else|elif)\b/) {
695                         ($type, $level) = @{$stack[$#stack - 1]};
696                 } elsif ($remainder =~ /^#\s*endif\b/) {
697                         ($type, $level) = @{pop(@stack)};
698                 }
699
700                 # Statement ends at the ';' or a close '}' at the
701                 # outermost level.
702                 if ($level == 0 && $c eq ';') {
703                         last;
704                 }
705
706                 # An else is really a conditional as long as its not else if
707                 if ($level == 0 && $coff_set == 0 &&
708                                 (!defined($p) || $p =~ /(?:\s|\}|\+)/) &&
709                                 $remainder =~ /^(else)(?:\s|{)/ &&
710                                 $remainder !~ /^else\s+if\b/) {
711                         $coff = $off + length($1) - 1;
712                         $coff_set = 1;
713                         #warn "CSB: mark coff<$coff> soff<$soff> 1<$1>\n";
714                         #warn "[" . substr($blk, $soff, $coff - $soff + 1) . "]\n";
715                 }
716
717                 if (($type eq '' || $type eq '(') && $c eq '(') {
718                         $level++;
719                         $type = '(';
720                 }
721                 if ($type eq '(' && $c eq ')') {
722                         $level--;
723                         $type = ($level != 0)? '(' : '';
724
725                         if ($level == 0 && $coff < $soff) {
726                                 $coff = $off;
727                                 $coff_set = 1;
728                                 #warn "CSB: mark coff<$coff>\n";
729                         }
730                 }
731                 if (($type eq '' || $type eq '{') && $c eq '{') {
732                         $level++;
733                         $type = '{';
734                 }
735                 if ($type eq '{' && $c eq '}') {
736                         $level--;
737                         $type = ($level != 0)? '{' : '';
738
739                         if ($level == 0) {
740                                 if (substr($blk, $off + 1, 1) eq ';') {
741                                         $off++;
742                                 }
743                                 last;
744                         }
745                 }
746                 # Preprocessor commands end at the newline unless escaped.
747                 if ($type eq '#' && $c eq "\n" && $p ne "\\") {
748                         $level--;
749                         $type = '';
750                         $off++;
751                         last;
752                 }
753                 $off++;
754         }
755         # We are truly at the end, so shuffle to the next line.
756         if ($off == $len) {
757                 $loff = $len + 1;
758                 $line++;
759                 $remain--;
760         }
761
762         my $statement = substr($blk, $soff, $off - $soff + 1);
763         my $condition = substr($blk, $soff, $coff - $soff + 1);
764
765         #warn "STATEMENT<$statement>\n";
766         #warn "CONDITION<$condition>\n";
767
768         #print "coff<$coff> soff<$off> loff<$loff>\n";
769
770         return ($statement, $condition,
771                         $line, $remain + 1, $off - $loff + 1, $level);
772 }
773
774 sub statement_lines {
775         my ($stmt) = @_;
776
777         # Strip the diff line prefixes and rip blank lines at start and end.
778         $stmt =~ s/(^|\n)./$1/g;
779         $stmt =~ s/^\s*//;
780         $stmt =~ s/\s*$//;
781
782         my @stmt_lines = ($stmt =~ /\n/g);
783
784         return $#stmt_lines + 2;
785 }
786
787 sub statement_rawlines {
788         my ($stmt) = @_;
789
790         my @stmt_lines = ($stmt =~ /\n/g);
791
792         return $#stmt_lines + 2;
793 }
794
795 sub statement_block_size {
796         my ($stmt) = @_;
797
798         $stmt =~ s/(^|\n)./$1/g;
799         $stmt =~ s/^\s*{//;
800         $stmt =~ s/}\s*$//;
801         $stmt =~ s/^\s*//;
802         $stmt =~ s/\s*$//;
803
804         my @stmt_lines = ($stmt =~ /\n/g);
805         my @stmt_statements = ($stmt =~ /;/g);
806
807         my $stmt_lines = $#stmt_lines + 2;
808         my $stmt_statements = $#stmt_statements + 1;
809
810         if ($stmt_lines > $stmt_statements) {
811                 return $stmt_lines;
812         } else {
813                 return $stmt_statements;
814         }
815 }
816
817 sub ctx_statement_full {
818         my ($linenr, $remain, $off) = @_;
819         my ($statement, $condition, $level);
820
821         my (@chunks);
822
823         # Grab the first conditional/block pair.
824         ($statement, $condition, $linenr, $remain, $off, $level) =
825                                 ctx_statement_block($linenr, $remain, $off);
826         #print "F: c<$condition> s<$statement> remain<$remain>\n";
827         push(@chunks, [ $condition, $statement ]);
828         if (!($remain > 0 && $condition =~ /^\s*(?:\n[+-])?\s*(?:if|else|do)\b/s)) {
829                 return ($level, $linenr, @chunks);
830         }
831
832         # Pull in the following conditional/block pairs and see if they
833         # could continue the statement.
834         for (;;) {
835                 ($statement, $condition, $linenr, $remain, $off, $level) =
836                                 ctx_statement_block($linenr, $remain, $off);
837                 #print "C: c<$condition> s<$statement> remain<$remain>\n";
838                 last if (!($remain > 0 && $condition =~ /^(?:\s*\n[+-])*\s*(?:else|do)\b/s));
839                 #print "C: push\n";
840                 push(@chunks, [ $condition, $statement ]);
841         }
842
843         return ($level, $linenr, @chunks);
844 }
845
846 sub ctx_block_get {
847         my ($linenr, $remain, $outer, $open, $close, $off) = @_;
848         my $line;
849         my $start = $linenr - 1;
850         my $blk = '';
851         my @o;
852         my @c;
853         my @res = ();
854
855         my $level = 0;
856         my @stack = ($level);
857         for ($line = $start; $remain > 0; $line++) {
858                 next if ($rawlines[$line] =~ /^-/);
859                 $remain--;
860
861                 $blk .= $rawlines[$line];
862
863                 # Handle nested #if/#else.
864                 if ($lines[$line] =~ /^.\s*#\s*(?:ifndef|ifdef|if)\s/) {
865                         push(@stack, $level);
866                 } elsif ($lines[$line] =~ /^.\s*#\s*(?:else|elif)\b/) {
867                         $level = $stack[$#stack - 1];
868                 } elsif ($lines[$line] =~ /^.\s*#\s*endif\b/) {
869                         $level = pop(@stack);
870                 }
871
872                 foreach my $c (split(//, $lines[$line])) {
873                         ##print "C<$c>L<$level><$open$close>O<$off>\n";
874                         if ($off > 0) {
875                                 $off--;
876                                 next;
877                         }
878
879                         if ($c eq $close && $level > 0) {
880                                 $level--;
881                                 last if ($level == 0);
882                         } elsif ($c eq $open) {
883                                 $level++;
884                         }
885                 }
886
887                 if (!$outer || $level <= 1) {
888                         push(@res, $rawlines[$line]);
889                 }
890
891                 last if ($level == 0);
892         }
893
894         return ($level, @res);
895 }
896 sub ctx_block_outer {
897         my ($linenr, $remain) = @_;
898
899         my ($level, @r) = ctx_block_get($linenr, $remain, 1, '{', '}', 0);
900         return @r;
901 }
902 sub ctx_block {
903         my ($linenr, $remain) = @_;
904
905         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '{', '}', 0);
906         return @r;
907 }
908 sub ctx_statement {
909         my ($linenr, $remain, $off) = @_;
910
911         my ($level, @r) = ctx_block_get($linenr, $remain, 0, '(', ')', $off);
912         return @r;
913 }
914 sub ctx_block_level {
915         my ($linenr, $remain) = @_;
916
917         return ctx_block_get($linenr, $remain, 0, '{', '}', 0);
918 }
919 sub ctx_statement_level {
920         my ($linenr, $remain, $off) = @_;
921
922         return ctx_block_get($linenr, $remain, 0, '(', ')', $off);
923 }
924
925 sub ctx_locate_comment {
926         my ($first_line, $end_line) = @_;
927
928         # Catch a comment on the end of the line itself.
929         my ($current_comment) = ($rawlines[$end_line - 1] =~ m@.*(/\*.*\*/)\s*(?:\\\s*)?$@);
930         return $current_comment if (defined $current_comment);
931
932         # Look through the context and try and figure out if there is a
933         # comment.
934         my $in_comment = 0;
935         $current_comment = '';
936         for (my $linenr = $first_line; $linenr < $end_line; $linenr++) {
937                 my $line = $rawlines[$linenr - 1];
938                 #warn "           $line\n";
939                 if ($linenr == $first_line and $line =~ m@^.\s*\*@) {
940                         $in_comment = 1;
941                 }
942                 if ($line =~ m@/\*@) {
943                         $in_comment = 1;
944                 }
945                 if (!$in_comment && $current_comment ne '') {
946                         $current_comment = '';
947                 }
948                 $current_comment .= $line . "\n" if ($in_comment);
949                 if ($line =~ m@\*/@) {
950                         $in_comment = 0;
951                 }
952         }
953
954         chomp($current_comment);
955         return($current_comment);
956 }
957 sub ctx_has_comment {
958         my ($first_line, $end_line) = @_;
959         my $cmt = ctx_locate_comment($first_line, $end_line);
960
961         ##print "LINE: $rawlines[$end_line - 1 ]\n";
962         ##print "CMMT: $cmt\n";
963
964         return ($cmt ne '');
965 }
966
967 sub raw_line {
968         my ($linenr, $cnt) = @_;
969
970         my $offset = $linenr - 1;
971         $cnt++;
972
973         my $line;
974         while ($cnt) {
975                 $line = $rawlines[$offset++];
976                 next if (defined($line) && $line =~ /^-/);
977                 $cnt--;
978         }
979
980         return $line;
981 }
982
983 sub cat_vet {
984         my ($vet) = @_;
985         my ($res, $coded);
986
987         $res = '';
988         while ($vet =~ /([^[:cntrl:]]*)([[:cntrl:]]|$)/g) {
989                 $res .= $1;
990                 if ($2 ne '') {
991                         $coded = sprintf("^%c", unpack('C', $2) + 64);
992                         $res .= $coded;
993                 }
994         }
995         $res =~ s/$/\$/;
996
997         return $res;
998 }
999
1000 my $av_preprocessor = 0;
1001 my $av_pending;
1002 my @av_paren_type;
1003 my $av_pend_colon;
1004
1005 sub annotate_reset {
1006         $av_preprocessor = 0;
1007         $av_pending = '_';
1008         @av_paren_type = ('E');
1009         $av_pend_colon = 'O';
1010 }
1011
1012 sub annotate_values {
1013         my ($stream, $type) = @_;
1014
1015         my $res;
1016         my $var = '_' x length($stream);
1017         my $cur = $stream;
1018
1019         print "$stream\n" if ($dbg_values > 1);
1020
1021         while (length($cur)) {
1022                 @av_paren_type = ('E') if ($#av_paren_type < 0);
1023                 print " <" . join('', @av_paren_type) .
1024                                 "> <$type> <$av_pending>" if ($dbg_values > 1);
1025                 if ($cur =~ /^(\s+)/o) {
1026                         print "WS($1)\n" if ($dbg_values > 1);
1027                         if ($1 =~ /\n/ && $av_preprocessor) {
1028                                 $type = pop(@av_paren_type);
1029                                 $av_preprocessor = 0;
1030                         }
1031
1032                 } elsif ($cur =~ /^(\(\s*$Type\s*)\)/ && $av_pending eq '_') {
1033                         print "CAST($1)\n" if ($dbg_values > 1);
1034                         push(@av_paren_type, $type);
1035                         $type = 'C';
1036
1037                 } elsif ($cur =~ /^($Type)\s*(?:$Ident|,|\)|\(|\s*$)/) {
1038                         print "DECLARE($1)\n" if ($dbg_values > 1);
1039                         $type = 'T';
1040
1041                 } elsif ($cur =~ /^($Modifier)\s*/) {
1042                         print "MODIFIER($1)\n" if ($dbg_values > 1);
1043                         $type = 'T';
1044
1045                 } elsif ($cur =~ /^(\#\s*define\s*$Ident)(\(?)/o) {
1046                         print "DEFINE($1,$2)\n" if ($dbg_values > 1);
1047                         $av_preprocessor = 1;
1048                         push(@av_paren_type, $type);
1049                         if ($2 ne '') {
1050                                 $av_pending = 'N';
1051                         }
1052                         $type = 'E';
1053
1054                 } elsif ($cur =~ /^(\#\s*(?:undef\s*$Ident|include\b))/o) {
1055                         print "UNDEF($1)\n" if ($dbg_values > 1);
1056                         $av_preprocessor = 1;
1057                         push(@av_paren_type, $type);
1058
1059                 } elsif ($cur =~ /^(\#\s*(?:ifdef|ifndef|if))/o) {
1060                         print "PRE_START($1)\n" if ($dbg_values > 1);
1061                         $av_preprocessor = 1;
1062
1063                         push(@av_paren_type, $type);
1064                         push(@av_paren_type, $type);
1065                         $type = 'E';
1066
1067                 } elsif ($cur =~ /^(\#\s*(?:else|elif))/o) {
1068                         print "PRE_RESTART($1)\n" if ($dbg_values > 1);
1069                         $av_preprocessor = 1;
1070
1071                         push(@av_paren_type, $av_paren_type[$#av_paren_type]);
1072
1073                         $type = 'E';
1074
1075                 } elsif ($cur =~ /^(\#\s*(?:endif))/o) {
1076                         print "PRE_END($1)\n" if ($dbg_values > 1);
1077
1078                         $av_preprocessor = 1;
1079
1080                         # Assume all arms of the conditional end as this
1081                         # one does, and continue as if the #endif was not here.
1082                         pop(@av_paren_type);
1083                         push(@av_paren_type, $type);
1084                         $type = 'E';
1085
1086                 } elsif ($cur =~ /^(\\\n)/o) {
1087                         print "PRECONT($1)\n" if ($dbg_values > 1);
1088
1089                 } elsif ($cur =~ /^(__attribute__)\s*\(?/o) {
1090                         print "ATTR($1)\n" if ($dbg_values > 1);
1091                         $av_pending = $type;
1092                         $type = 'N';
1093
1094                 } elsif ($cur =~ /^(sizeof)\s*(\()?/o) {
1095                         print "SIZEOF($1)\n" if ($dbg_values > 1);
1096                         if (defined $2) {
1097                                 $av_pending = 'V';
1098                         }
1099                         $type = 'N';
1100
1101                 } elsif ($cur =~ /^(if|while|for)\b/o) {
1102                         print "COND($1)\n" if ($dbg_values > 1);
1103                         $av_pending = 'E';
1104                         $type = 'N';
1105
1106                 } elsif ($cur =~/^(case)/o) {
1107                         print "CASE($1)\n" if ($dbg_values > 1);
1108                         $av_pend_colon = 'C';
1109                         $type = 'N';
1110
1111                 } elsif ($cur =~/^(return|else|goto|typeof|__typeof__)\b/o) {
1112                         print "KEYWORD($1)\n" if ($dbg_values > 1);
1113                         $type = 'N';
1114
1115                 } elsif ($cur =~ /^(\()/o) {
1116                         print "PAREN('$1')\n" if ($dbg_values > 1);
1117                         push(@av_paren_type, $av_pending);
1118                         $av_pending = '_';
1119                         $type = 'N';
1120
1121                 } elsif ($cur =~ /^(\))/o) {
1122                         my $new_type = pop(@av_paren_type);
1123                         if ($new_type ne '_') {
1124                                 $type = $new_type;
1125                                 print "PAREN('$1') -> $type\n"
1126                                                         if ($dbg_values > 1);
1127                         } else {
1128                                 print "PAREN('$1')\n" if ($dbg_values > 1);
1129                         }
1130
1131                 } elsif ($cur =~ /^($Ident)\s*\(/o) {
1132                         print "FUNC($1)\n" if ($dbg_values > 1);
1133                         $type = 'V';
1134                         $av_pending = 'V';
1135
1136                 } elsif ($cur =~ /^($Ident\s*):(?:\s*\d+\s*(,|=|;))?/) {
1137                         if (defined $2 && $type eq 'C' || $type eq 'T') {
1138                                 $av_pend_colon = 'B';
1139                         } elsif ($type eq 'E') {
1140                                 $av_pend_colon = 'L';
1141                         }
1142                         print "IDENT_COLON($1,$type>$av_pend_colon)\n" if ($dbg_values > 1);
1143                         $type = 'V';
1144
1145                 } elsif ($cur =~ /^($Ident|$Constant)/o) {
1146                         print "IDENT($1)\n" if ($dbg_values > 1);
1147                         $type = 'V';
1148
1149                 } elsif ($cur =~ /^($Assignment)/o) {
1150                         print "ASSIGN($1)\n" if ($dbg_values > 1);
1151                         $type = 'N';
1152
1153                 } elsif ($cur =~/^(;|{|})/) {
1154                         print "END($1)\n" if ($dbg_values > 1);
1155                         $type = 'E';
1156                         $av_pend_colon = 'O';
1157
1158                 } elsif ($cur =~/^(,)/) {
1159                         print "COMMA($1)\n" if ($dbg_values > 1);
1160                         $type = 'C';
1161
1162                 } elsif ($cur =~ /^(\?)/o) {
1163                         print "QUESTION($1)\n" if ($dbg_values > 1);
1164                         $type = 'N';
1165
1166                 } elsif ($cur =~ /^(:)/o) {
1167                         print "COLON($1,$av_pend_colon)\n" if ($dbg_values > 1);
1168
1169                         substr($var, length($res), 1, $av_pend_colon);
1170                         if ($av_pend_colon eq 'C' || $av_pend_colon eq 'L') {
1171                                 $type = 'E';
1172                         } else {
1173                                 $type = 'N';
1174                         }
1175                         $av_pend_colon = 'O';
1176
1177                 } elsif ($cur =~ /^(\[)/o) {
1178                         print "CLOSE($1)\n" if ($dbg_values > 1);
1179                         $type = 'N';
1180
1181                 } elsif ($cur =~ /^(-(?![->])|\+(?!\+)|\*|\&\&|\&)/o) {
1182                         my $variant;
1183
1184                         print "OPV($1)\n" if ($dbg_values > 1);
1185                         if ($type eq 'V') {
1186                                 $variant = 'B';
1187                         } else {
1188                                 $variant = 'U';
1189                         }
1190
1191                         substr($var, length($res), 1, $variant);
1192                         $type = 'N';
1193
1194                 } elsif ($cur =~ /^($Operators)/o) {
1195                         print "OP($1)\n" if ($dbg_values > 1);
1196                         if ($1 ne '++' && $1 ne '--') {
1197                                 $type = 'N';
1198                         }
1199
1200                 } elsif ($cur =~ /(^.)/o) {
1201                         print "C($1)\n" if ($dbg_values > 1);
1202                 }
1203                 if (defined $1) {
1204                         $cur = substr($cur, length($1));
1205                         $res .= $type x length($1);
1206                 }
1207         }
1208
1209         return ($res, $var);
1210 }
1211
1212 sub possible {
1213         my ($possible, $line) = @_;
1214         my $notPermitted = qr{(?:
1215                 ^(?:
1216                         $Modifier|
1217                         $Storage|
1218                         $Type|
1219                         DEFINE_\S+
1220                 )$|
1221                 ^(?:
1222                         goto|
1223                         return|
1224                         case|
1225                         else|
1226                         asm|__asm__|
1227                         do|
1228                         \#|
1229                         \#\#|
1230                 )(?:\s|$)|
1231                 ^(?:typedef|struct|enum)\b
1232             )}x;
1233         warn "CHECK<$possible> ($line)\n" if ($dbg_possible > 2);
1234         if ($possible !~ $notPermitted) {
1235                 # Check for modifiers.
1236                 $possible =~ s/\s*$Storage\s*//g;
1237                 $possible =~ s/\s*$Sparse\s*//g;
1238                 if ($possible =~ /^\s*$/) {
1239
1240                 } elsif ($possible =~ /\s/) {
1241                         $possible =~ s/\s*$Type\s*//g;
1242                         for my $modifier (split(' ', $possible)) {
1243                                 if ($modifier !~ $notPermitted) {
1244                                         warn "MODIFIER: $modifier ($possible) ($line)\n" if ($dbg_possible);
1245                                         push(@modifierList, $modifier);
1246                                 }
1247                         }
1248
1249                 } else {
1250                         warn "POSSIBLE: $possible ($line)\n" if ($dbg_possible);
1251                         push(@typeList, $possible);
1252                 }
1253                 build_types();
1254         } else {
1255                 warn "NOTPOSS: $possible ($line)\n" if ($dbg_possible > 1);
1256         }
1257 }
1258
1259 my $prefix = '';
1260
1261 sub show_type {
1262        return !defined $ignore_type{$_[0]};
1263 }
1264
1265 sub report {
1266         if (!show_type($_[1]) ||
1267             (defined $tst_only && $_[2] !~ /\Q$tst_only\E/)) {
1268                 return 0;
1269         }
1270         my $line;
1271         if ($show_types) {
1272                 $line = "$prefix$_[0]:$_[1]: $_[2]\n";
1273         } else {
1274                 $line = "$prefix$_[0]: $_[2]\n";
1275         }
1276         $line = (split('\n', $line))[0] . "\n" if ($terse);
1277
1278         push(our @report, $line);
1279
1280         return 1;
1281 }
1282 sub report_dump {
1283         our @report;
1284 }
1285
1286 sub ERROR {
1287         if (report("ERROR", $_[0], $_[1])) {
1288                 our $clean = 0;
1289                 our $cnt_error++;
1290         }
1291 }
1292 sub WARN {
1293         if (report("WARNING", $_[0], $_[1])) {
1294                 our $clean = 0;
1295                 our $cnt_warn++;
1296         }
1297 }
1298 sub CHK {
1299         if ($check && report("CHECK", $_[0], $_[1])) {
1300                 our $clean = 0;
1301                 our $cnt_chk++;
1302         }
1303 }
1304
1305 sub check_absolute_file {
1306         my ($absolute, $herecurr) = @_;
1307         my $file = $absolute;
1308
1309         ##print "absolute<$absolute>\n";
1310
1311         # See if any suffix of this path is a path within the tree.
1312         while ($file =~ s@^[^/]*/@@) {
1313                 if (-f "$root/$file") {
1314                         ##print "file<$file>\n";
1315                         last;
1316                 }
1317         }
1318         if (! -f _)  {
1319                 return 0;
1320         }
1321
1322         # It is, so see if the prefix is acceptable.
1323         my $prefix = $absolute;
1324         substr($prefix, -length($file)) = '';
1325
1326         ##print "prefix<$prefix>\n";
1327         if ($prefix ne ".../") {
1328                 WARN("USE_RELATIVE_PATH",
1329                      "use relative pathname instead of absolute in changelog text\n" . $herecurr);
1330         }
1331 }
1332
1333 sub process {
1334         my $filename = shift;
1335
1336         my $linenr=0;
1337         my $prevline="";
1338         my $prevrawline="";
1339         my $stashline="";
1340         my $stashrawline="";
1341
1342         my $length;
1343         my $indent;
1344         my $previndent=0;
1345         my $stashindent=0;
1346
1347         our $clean = 1;
1348         my $signoff = 0;
1349         my $is_patch = 0;
1350
1351         my $in_header_lines = 1;
1352         my $in_commit_log = 0;          #Scanning lines before patch
1353
1354         our @report = ();
1355         our $cnt_lines = 0;
1356         our $cnt_error = 0;
1357         our $cnt_warn = 0;
1358         our $cnt_chk = 0;
1359
1360         # Trace the real file/line as we go.
1361         my $realfile = '';
1362         my $realline = 0;
1363         my $realcnt = 0;
1364         my $here = '';
1365         my $in_comment = 0;
1366         my $comment_edge = 0;
1367         my $first_line = 0;
1368         my $p1_prefix = '';
1369
1370         my $prev_values = 'E';
1371
1372         # suppression flags
1373         my %suppress_ifbraces;
1374         my %suppress_whiletrailers;
1375         my %suppress_export;
1376         my $suppress_statement = 0;
1377
1378         # Pre-scan the patch sanitizing the lines.
1379         # Pre-scan the patch looking for any __setup documentation.
1380         #
1381         my @setup_docs = ();
1382         my $setup_docs = 0;
1383
1384         sanitise_line_reset();
1385         my $line;
1386         foreach my $rawline (@rawlines) {
1387                 $linenr++;
1388                 $line = $rawline;
1389
1390                 if ($rawline=~/^\+\+\+\s+(\S+)/) {
1391                         $setup_docs = 0;
1392                         if ($1 =~ m@Documentation/kernel-parameters.txt$@) {
1393                                 $setup_docs = 1;
1394                         }
1395                         #next;
1396                 }
1397                 if ($rawline=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1398                         $realline=$1-1;
1399                         if (defined $2) {
1400                                 $realcnt=$3+1;
1401                         } else {
1402                                 $realcnt=1+1;
1403                         }
1404                         $in_comment = 0;
1405
1406                         # Guestimate if this is a continuing comment.  Run
1407                         # the context looking for a comment "edge".  If this
1408                         # edge is a close comment then we must be in a comment
1409                         # at context start.
1410                         my $edge;
1411                         my $cnt = $realcnt;
1412                         for (my $ln = $linenr + 1; $cnt > 0; $ln++) {
1413                                 next if (defined $rawlines[$ln - 1] &&
1414                                          $rawlines[$ln - 1] =~ /^-/);
1415                                 $cnt--;
1416                                 #print "RAW<$rawlines[$ln - 1]>\n";
1417                                 last if (!defined $rawlines[$ln - 1]);
1418                                 if ($rawlines[$ln - 1] =~ m@(/\*|\*/)@ &&
1419                                     $rawlines[$ln - 1] !~ m@"[^"]*(?:/\*|\*/)[^"]*"@) {
1420                                         ($edge) = $1;
1421                                         last;
1422                                 }
1423                         }
1424                         if (defined $edge && $edge eq '*/') {
1425                                 $in_comment = 1;
1426                         }
1427
1428                         # Guestimate if this is a continuing comment.  If this
1429                         # is the start of a diff block and this line starts
1430                         # ' *' then it is very likely a comment.
1431                         if (!defined $edge &&
1432                             $rawlines[$linenr] =~ m@^.\s*(?:\*\*+| \*)(?:\s|$)@)
1433                         {
1434                                 $in_comment = 1;
1435                         }
1436
1437                         ##print "COMMENT:$in_comment edge<$edge> $rawline\n";
1438                         sanitise_line_reset($in_comment);
1439
1440                 } elsif ($realcnt && $rawline =~ /^(?:\+| |$)/) {
1441                         # Standardise the strings and chars within the input to
1442                         # simplify matching -- only bother with positive lines.
1443                         $line = sanitise_line($rawline);
1444                 }
1445                 push(@lines, $line);
1446
1447                 if ($realcnt > 1) {
1448                         $realcnt-- if ($line =~ /^(?:\+| |$)/);
1449                 } else {
1450                         $realcnt = 0;
1451                 }
1452
1453                 #print "==>$rawline\n";
1454                 #print "-->$line\n";
1455
1456                 if ($setup_docs && $line =~ /^\+/) {
1457                         push(@setup_docs, $line);
1458                 }
1459         }
1460
1461         $prefix = '';
1462
1463         $realcnt = 0;
1464         $linenr = 0;
1465         foreach my $line (@lines) {
1466                 $linenr++;
1467
1468                 my $rawline = $rawlines[$linenr - 1];
1469
1470 #extract the line range in the file after the patch is applied
1471                 if ($line=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
1472                         $is_patch = 1;
1473                         $first_line = $linenr + 1;
1474                         $realline=$1-1;
1475                         if (defined $2) {
1476                                 $realcnt=$3+1;
1477                         } else {
1478                                 $realcnt=1+1;
1479                         }
1480                         annotate_reset();
1481                         $prev_values = 'E';
1482
1483                         %suppress_ifbraces = ();
1484                         %suppress_whiletrailers = ();
1485                         %suppress_export = ();
1486                         $suppress_statement = 0;
1487                         next;
1488
1489 # track the line number as we move through the hunk, note that
1490 # new versions of GNU diff omit the leading space on completely
1491 # blank context lines so we need to count that too.
1492                 } elsif ($line =~ /^( |\+|$)/) {
1493                         $realline++;
1494                         $realcnt-- if ($realcnt != 0);
1495
1496                         # Measure the line length and indent.
1497                         ($length, $indent) = line_stats($rawline);
1498
1499                         # Track the previous line.
1500                         ($prevline, $stashline) = ($stashline, $line);
1501                         ($previndent, $stashindent) = ($stashindent, $indent);
1502                         ($prevrawline, $stashrawline) = ($stashrawline, $rawline);
1503
1504                         #warn "line<$line>\n";
1505
1506                 } elsif ($realcnt == 1) {
1507                         $realcnt--;
1508                 }
1509
1510                 my $hunk_line = ($realcnt != 0);
1511
1512 #make up the handle for any error we report on this line
1513                 $prefix = "$filename:$realline: " if ($emacs && $file);
1514                 $prefix = "$filename:$linenr: " if ($emacs && !$file);
1515
1516                 $here = "#$linenr: " if (!$file);
1517                 $here = "#$realline: " if ($file);
1518
1519                 # extract the filename as it passes
1520                 if ($line =~ /^diff --git.*?(\S+)$/) {
1521                         $realfile = $1;
1522                         $realfile =~ s@^([^/]*)/@@;
1523                         $in_commit_log = 0;
1524                 } elsif ($line =~ /^\+\+\+\s+(\S+)/) {
1525                         $realfile = $1;
1526                         $realfile =~ s@^([^/]*)/@@;
1527                         $in_commit_log = 0;
1528
1529                         $p1_prefix = $1;
1530                         if (!$file && $tree && $p1_prefix ne '' &&
1531                             -e "$root/$p1_prefix") {
1532                                 WARN("PATCH_PREFIX",
1533                                      "patch prefix '$p1_prefix' exists, appears to be a -p0 patch\n");
1534                         }
1535
1536                         if ($realfile =~ m@^include/asm/@) {
1537                                 ERROR("MODIFIED_INCLUDE_ASM",
1538                                       "do not modify files in include/asm, change architecture specific files in include/asm-<architecture>\n" . "$here$rawline\n");
1539                         }
1540                         next;
1541                 }
1542
1543                 $here .= "FILE: $realfile:$realline:" if ($realcnt != 0);
1544
1545                 my $hereline = "$here\n$rawline\n";
1546                 my $herecurr = "$here\n$rawline\n";
1547                 my $hereprev = "$here\n$prevrawline\n$rawline\n";
1548
1549                 $cnt_lines++ if ($realcnt != 0);
1550
1551 # Check for incorrect file permissions
1552                 if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) {
1553                         my $permhere = $here . "FILE: $realfile\n";
1554                         if ($realfile =~ /(Makefile|Kconfig|\.c|\.h|\.S|\.tmpl)$/) {
1555                                 ERROR("EXECUTE_PERMISSIONS",
1556                                       "do not set execute permissions for source files\n" . $permhere);
1557                         }
1558                 }
1559
1560 # Check the patch for a signoff:
1561                 if ($line =~ /^\s*signed-off-by:/i) {
1562                         $signoff++;
1563                         $in_commit_log = 0;
1564                 }
1565
1566 # Check signature styles
1567                 if (!$in_header_lines &&
1568                     $line =~ /^(\s*)($signature_tags)(\s*)(.*)/) {
1569                         my $space_before = $1;
1570                         my $sign_off = $2;
1571                         my $space_after = $3;
1572                         my $email = $4;
1573                         my $ucfirst_sign_off = ucfirst(lc($sign_off));
1574
1575                         if (defined $space_before && $space_before ne "") {
1576                                 WARN("BAD_SIGN_OFF",
1577                                      "Do not use whitespace before $ucfirst_sign_off\n" . $herecurr);
1578                         }
1579                         if ($sign_off =~ /-by:$/i && $sign_off ne $ucfirst_sign_off) {
1580                                 WARN("BAD_SIGN_OFF",
1581                                      "'$ucfirst_sign_off' is the preferred signature form\n" . $herecurr);
1582                         }
1583                         if (!defined $space_after || $space_after ne " ") {
1584                                 WARN("BAD_SIGN_OFF",
1585                                      "Use a single space after $ucfirst_sign_off\n" . $herecurr);
1586                         }
1587
1588                         my ($email_name, $email_address, $comment) = parse_email($email);
1589                         my $suggested_email = format_email(($email_name, $email_address));
1590                         if ($suggested_email eq "") {
1591                                 ERROR("BAD_SIGN_OFF",
1592                                       "Unrecognized email address: '$email'\n" . $herecurr);
1593                         } else {
1594                                 my $dequoted = $suggested_email;
1595                                 $dequoted =~ s/^"//;
1596                                 $dequoted =~ s/" </ </;
1597                                 # Don't force email to have quotes
1598                                 # Allow just an angle bracketed address
1599                                 if ("$dequoted$comment" ne $email &&
1600                                     "<$email_address>$comment" ne $email &&
1601                                     "$suggested_email$comment" ne $email) {
1602                                         WARN("BAD_SIGN_OFF",
1603                                              "email address '$email' might be better as '$suggested_email$comment'\n" . $herecurr);
1604                                 }
1605                         }
1606                 }
1607
1608 # Check for wrappage within a valid hunk of the file
1609                 if ($realcnt != 0 && $line !~ m{^(?:\+|-| |\\ No newline|$)}) {
1610                         ERROR("CORRUPTED_PATCH",
1611                               "patch seems to be corrupt (line wrapped?)\n" .
1612                                 $herecurr) if (!$emitted_corrupt++);
1613                 }
1614
1615 # Check for absolute kernel paths.
1616                 if ($tree) {
1617                         while ($line =~ m{(?:^|\s)(/\S*)}g) {
1618                                 my $file = $1;
1619
1620                                 if ($file =~ m{^(.*?)(?::\d+)+:?$} &&
1621                                     check_absolute_file($1, $herecurr)) {
1622                                         #
1623                                 } else {
1624                                         check_absolute_file($file, $herecurr);
1625                                 }
1626                         }
1627                 }
1628
1629 # UTF-8 regex found at http://www.w3.org/International/questions/qa-forms-utf-8.en.php
1630                 if (($realfile =~ /^$/ || $line =~ /^\+/) &&
1631                     $rawline !~ m/^$UTF8*$/) {
1632                         my ($utf8_prefix) = ($rawline =~ /^($UTF8*)/);
1633
1634                         my $blank = copy_spacing($rawline);
1635                         my $ptr = substr($blank, 0, length($utf8_prefix)) . "^";
1636                         my $hereptr = "$hereline$ptr\n";
1637
1638                         CHK("INVALID_UTF8",
1639                             "Invalid UTF-8, patch and commit message should be encoded in UTF-8\n" . $hereptr);
1640                 }
1641
1642 # Check if it's the start of a commit log
1643 # (not a header line and we haven't seen the patch filename)
1644                 if ($in_header_lines && $realfile =~ /^$/ &&
1645                     $rawline !~ /^(commit\b|from\b|[\w-]+:).+$/i) {
1646                         $in_header_lines = 0;
1647                         $in_commit_log = 1;
1648                 }
1649
1650 # Still not yet in a patch, check for any UTF-8
1651                 if ($in_commit_log && $realfile =~ /^$/ &&
1652                     $rawline =~ /$NON_ASCII_UTF8/) {
1653                         CHK("UTF8_BEFORE_PATCH",
1654                             "8-bit UTF-8 used in possible commit log\n" . $herecurr);
1655                 }
1656
1657 # ignore non-hunk lines and lines being removed
1658                 next if (!$hunk_line || $line =~ /^-/);
1659
1660 #trailing whitespace
1661                 if ($line =~ /^\+.*\015/) {
1662                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1663                         ERROR("DOS_LINE_ENDINGS",
1664                               "DOS line endings\n" . $herevet);
1665
1666                 } elsif ($rawline =~ /^\+.*\S\s+$/ || $rawline =~ /^\+\s+$/) {
1667                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1668                         ERROR("TRAILING_WHITESPACE",
1669                               "trailing whitespace\n" . $herevet);
1670                         $rpt_cleaners = 1;
1671                 }
1672
1673 # check for Kconfig help text having a real description
1674 # Only applies when adding the entry originally, after that we do not have
1675 # sufficient context to determine whether it is indeed long enough.
1676                 if ($realfile =~ /Kconfig/ &&
1677                     $line =~ /\+\s*(?:---)?help(?:---)?$/) {
1678                         my $length = 0;
1679                         my $cnt = $realcnt;
1680                         my $ln = $linenr + 1;
1681                         my $f;
1682                         my $is_end = 0;
1683                         while ($cnt > 0 && defined $lines[$ln - 1]) {
1684                                 $f = $lines[$ln - 1];
1685                                 $cnt-- if ($lines[$ln - 1] !~ /^-/);
1686                                 $is_end = $lines[$ln - 1] =~ /^\+/;
1687                                 $ln++;
1688
1689                                 next if ($f =~ /^-/);
1690                                 $f =~ s/^.//;
1691                                 $f =~ s/#.*//;
1692                                 $f =~ s/^\s+//;
1693                                 next if ($f =~ /^$/);
1694                                 if ($f =~ /^\s*config\s/) {
1695                                         $is_end = 1;
1696                                         last;
1697                                 }
1698                                 $length++;
1699                         }
1700                         WARN("CONFIG_DESCRIPTION",
1701                              "please write a paragraph that describes the config symbol fully\n" . $herecurr) if ($is_end && $length < 4);
1702                         #print "is_end<$is_end> length<$length>\n";
1703                 }
1704
1705                 if (($realfile =~ /Makefile.*/ || $realfile =~ /Kbuild.*/) &&
1706                     ($line =~ /\+(EXTRA_[A-Z]+FLAGS).*/)) {
1707                         my $flag = $1;
1708                         my $replacement = {
1709                                 'EXTRA_AFLAGS' =>   'asflags-y',
1710                                 'EXTRA_CFLAGS' =>   'ccflags-y',
1711                                 'EXTRA_CPPFLAGS' => 'cppflags-y',
1712                                 'EXTRA_LDFLAGS' =>  'ldflags-y',
1713                         };
1714
1715                         WARN("DEPRECATED_VARIABLE",
1716                              "Use of $flag is deprecated, please use \`$replacement->{$flag} instead.\n" . $herecurr) if ($replacement->{$flag});
1717                 }
1718
1719 # check we are in a valid source file if not then ignore this hunk
1720                 next if ($realfile !~ /\.(h|c|s|S|pl|sh)$/);
1721
1722 #80 column limit
1723                 if ($line =~ /^\+/ && $prevrawline !~ /\/\*\*/ &&
1724                     $rawline !~ /^.\s*\*\s*\@$Ident\s/ &&
1725                     !($line =~ /^\+\s*$logFunctions\s*\(\s*(?:(KERN_\S+\s*|[^"]*))?"[X\t]*"\s*(?:|,|\)\s*;)\s*$/ ||
1726                     $line =~ /^\+\s*"[^"]*"\s*(?:\s*|,|\)\s*;)\s*$/) &&
1727                     $length > 80)
1728                 {
1729                         WARN("LONG_LINE",
1730                              "line over 80 characters\n" . $herecurr);
1731                 }
1732
1733 # check for spaces before a quoted newline
1734                 if ($rawline =~ /^.*\".*\s\\n/) {
1735                         WARN("QUOTED_WHITESPACE_BEFORE_NEWLINE",
1736                              "unnecessary whitespace before a quoted newline\n" . $herecurr);
1737                 }
1738
1739 # check for adding lines without a newline.
1740                 if ($line =~ /^\+/ && defined $lines[$linenr] && $lines[$linenr] =~ /^\\ No newline at end of file/) {
1741                         WARN("MISSING_EOF_NEWLINE",
1742                              "adding a line without newline at end of file\n" . $herecurr);
1743                 }
1744
1745 # Blackfin: use hi/lo macros
1746                 if ($realfile =~ m@arch/blackfin/.*\.S$@) {
1747                         if ($line =~ /\.[lL][[:space:]]*=.*&[[:space:]]*0x[fF][fF][fF][fF]/) {
1748                                 my $herevet = "$here\n" . cat_vet($line) . "\n";
1749                                 ERROR("LO_MACRO",
1750                                       "use the LO() macro, not (... & 0xFFFF)\n" . $herevet);
1751                         }
1752                         if ($line =~ /\.[hH][[:space:]]*=.*>>[[:space:]]*16/) {
1753                                 my $herevet = "$here\n" . cat_vet($line) . "\n";
1754                                 ERROR("HI_MACRO",
1755                                       "use the HI() macro, not (... >> 16)\n" . $herevet);
1756                         }
1757                 }
1758
1759 # check we are in a valid source file C or perl if not then ignore this hunk
1760                 next if ($realfile !~ /\.(h|c|pl)$/);
1761
1762 # at the beginning of a line any tabs must come first and anything
1763 # more than 8 must use tabs.
1764                 if ($rawline =~ /^\+\s* \t\s*\S/ ||
1765                     $rawline =~ /^\+\s*        \s*/) {
1766                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1767                         ERROR("CODE_INDENT",
1768                               "code indent should use tabs where possible\n" . $herevet);
1769                         $rpt_cleaners = 1;
1770                 }
1771
1772 # check for space before tabs.
1773                 if ($rawline =~ /^\+/ && $rawline =~ / \t/) {
1774                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1775                         WARN("SPACE_BEFORE_TAB",
1776                              "please, no space before tabs\n" . $herevet);
1777                 }
1778
1779 # check for spaces at the beginning of a line.
1780 # Exceptions:
1781 #  1) within comments
1782 #  2) indented preprocessor commands
1783 #  3) hanging labels
1784                 if ($rawline =~ /^\+ / && $line !~ /\+ *(?:$;|#|$Ident:)/)  {
1785                         my $herevet = "$here\n" . cat_vet($rawline) . "\n";
1786                         WARN("LEADING_SPACE",
1787                              "please, no spaces at the start of a line\n" . $herevet);
1788                 }
1789
1790 # check we are in a valid C source file if not then ignore this hunk
1791                 next if ($realfile !~ /\.(h|c)$/);
1792
1793 # check for RCS/CVS revision markers
1794                 if ($rawline =~ /^\+.*\$(Revision|Log|Id)(?:\$|)/) {
1795                         WARN("CVS_KEYWORD",
1796                              "CVS style keyword markers, these will _not_ be updated\n". $herecurr);
1797                 }
1798
1799 # Blackfin: don't use __builtin_bfin_[cs]sync
1800                 if ($line =~ /__builtin_bfin_csync/) {
1801                         my $herevet = "$here\n" . cat_vet($line) . "\n";
1802                         ERROR("CSYNC",
1803                               "use the CSYNC() macro in asm/blackfin.h\n" . $herevet);
1804                 }
1805                 if ($line =~ /__builtin_bfin_ssync/) {
1806                         my $herevet = "$here\n" . cat_vet($line) . "\n";
1807                         ERROR("SSYNC",
1808                               "use the SSYNC() macro in asm/blackfin.h\n" . $herevet);
1809                 }
1810
1811 # Check for potential 'bare' types
1812                 my ($stat, $cond, $line_nr_next, $remain_next, $off_next,
1813                     $realline_next);
1814 #print "LINE<$line>\n";
1815                 if ($linenr >= $suppress_statement &&
1816                     $realcnt && $line =~ /.\s*\S/) {
1817                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
1818                                 ctx_statement_block($linenr, $realcnt, 0);
1819                         $stat =~ s/\n./\n /g;
1820                         $cond =~ s/\n./\n /g;
1821
1822 #print "linenr<$linenr> <$stat>\n";
1823                         # If this statement has no statement boundaries within
1824                         # it there is no point in retrying a statement scan
1825                         # until we hit end of it.
1826                         my $frag = $stat; $frag =~ s/;+\s*$//;
1827                         if ($frag !~ /(?:{|;)/) {
1828 #print "skip<$line_nr_next>\n";
1829                                 $suppress_statement = $line_nr_next;
1830                         }
1831
1832                         # Find the real next line.
1833                         $realline_next = $line_nr_next;
1834                         if (defined $realline_next &&
1835                             (!defined $lines[$realline_next - 1] ||
1836                              substr($lines[$realline_next - 1], $off_next) =~ /^\s*$/)) {
1837                                 $realline_next++;
1838                         }
1839
1840                         my $s = $stat;
1841                         $s =~ s/{.*$//s;
1842
1843                         # Ignore goto labels.
1844                         if ($s =~ /$Ident:\*$/s) {
1845
1846                         # Ignore functions being called
1847                         } elsif ($s =~ /^.\s*$Ident\s*\(/s) {
1848
1849                         } elsif ($s =~ /^.\s*else\b/s) {
1850
1851                         # declarations always start with types
1852                         } elsif ($prev_values eq 'E' && $s =~ /^.\s*(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?((?:\s*$Ident)+?)\b(?:\s+$Sparse)?\s*\**\s*(?:$Ident|\(\*[^\)]*\))(?:\s*$Modifier)?\s*(?:;|=|,|\()/s) {
1853                                 my $type = $1;
1854                                 $type =~ s/\s+/ /g;
1855                                 possible($type, "A:" . $s);
1856
1857                         # definitions in global scope can only start with types
1858                         } elsif ($s =~ /^.(?:$Storage\s+)?(?:$Inline\s+)?(?:const\s+)?($Ident)\b\s*(?!:)/s) {
1859                                 possible($1, "B:" . $s);
1860                         }
1861
1862                         # any (foo ... *) is a pointer cast, and foo is a type
1863                         while ($s =~ /\(($Ident)(?:\s+$Sparse)*[\s\*]+\s*\)/sg) {
1864                                 possible($1, "C:" . $s);
1865                         }
1866
1867                         # Check for any sort of function declaration.
1868                         # int foo(something bar, other baz);
1869                         # void (*store_gdt)(x86_descr_ptr *);
1870                         if ($prev_values eq 'E' && $s =~ /^(.(?:typedef\s*)?(?:(?:$Storage|$Inline)\s*)*\s*$Type\s*(?:\b$Ident|\(\*\s*$Ident\))\s*)\(/s) {
1871                                 my ($name_len) = length($1);
1872
1873                                 my $ctx = $s;
1874                                 substr($ctx, 0, $name_len + 1, '');
1875                                 $ctx =~ s/\)[^\)]*$//;
1876
1877                                 for my $arg (split(/\s*,\s*/, $ctx)) {
1878                                         if ($arg =~ /^(?:const\s+)?($Ident)(?:\s+$Sparse)*\s*\**\s*(:?\b$Ident)?$/s || $arg =~ /^($Ident)$/s) {
1879
1880                                                 possible($1, "D:" . $s);
1881                                         }
1882                                 }
1883                         }
1884
1885                 }
1886
1887 #
1888 # Checks which may be anchored in the context.
1889 #
1890
1891 # Check for switch () and associated case and default
1892 # statements should be at the same indent.
1893                 if ($line=~/\bswitch\s*\(.*\)/) {
1894                         my $err = '';
1895                         my $sep = '';
1896                         my @ctx = ctx_block_outer($linenr, $realcnt);
1897                         shift(@ctx);
1898                         for my $ctx (@ctx) {
1899                                 my ($clen, $cindent) = line_stats($ctx);
1900                                 if ($ctx =~ /^\+\s*(case\s+|default:)/ &&
1901                                                         $indent != $cindent) {
1902                                         $err .= "$sep$ctx\n";
1903                                         $sep = '';
1904                                 } else {
1905                                         $sep = "[...]\n";
1906                                 }
1907                         }
1908                         if ($err ne '') {
1909                                 ERROR("SWITCH_CASE_INDENT_LEVEL",
1910                                       "switch and case should be at the same indent\n$hereline$err");
1911                         }
1912                 }
1913
1914 # if/while/etc brace do not go on next line, unless defining a do while loop,
1915 # or if that brace on the next line is for something else
1916                 if ($line =~ /(.*)\b((?:if|while|for|switch)\s*\(|do\b|else\b)/ && $line !~ /^.\s*\#/) {
1917                         my $pre_ctx = "$1$2";
1918
1919                         my ($level, @ctx) = ctx_statement_level($linenr, $realcnt, 0);
1920                         my $ctx_cnt = $realcnt - $#ctx - 1;
1921                         my $ctx = join("\n", @ctx);
1922
1923                         my $ctx_ln = $linenr;
1924                         my $ctx_skip = $realcnt;
1925
1926                         while ($ctx_skip > $ctx_cnt || ($ctx_skip == $ctx_cnt &&
1927                                         defined $lines[$ctx_ln - 1] &&
1928                                         $lines[$ctx_ln - 1] =~ /^-/)) {
1929                                 ##print "SKIP<$ctx_skip> CNT<$ctx_cnt>\n";
1930                                 $ctx_skip-- if (!defined $lines[$ctx_ln - 1] || $lines[$ctx_ln - 1] !~ /^-/);
1931                                 $ctx_ln++;
1932                         }
1933
1934                         #print "realcnt<$realcnt> ctx_cnt<$ctx_cnt>\n";
1935                         #print "pre<$pre_ctx>\nline<$line>\nctx<$ctx>\nnext<$lines[$ctx_ln - 1]>\n";
1936
1937                         if ($ctx !~ /{\s*/ && defined($lines[$ctx_ln -1]) && $lines[$ctx_ln - 1] =~ /^\+\s*{/) {
1938                                 ERROR("OPEN_BRACE",
1939                                       "that open brace { should be on the previous line\n" .
1940                                         "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
1941                         }
1942                         if ($level == 0 && $pre_ctx !~ /}\s*while\s*\($/ &&
1943                             $ctx =~ /\)\s*\;\s*$/ &&
1944                             defined $lines[$ctx_ln - 1])
1945                         {
1946                                 my ($nlength, $nindent) = line_stats($lines[$ctx_ln - 1]);
1947                                 if ($nindent > $indent) {
1948                                         WARN("TRAILING_SEMICOLON",
1949                                              "trailing semicolon indicates no statements, indent implies otherwise\n" .
1950                                                 "$here\n$ctx\n$rawlines[$ctx_ln - 1]\n");
1951                                 }
1952                         }
1953                 }
1954
1955 # Check relative indent for conditionals and blocks.
1956                 if ($line =~ /\b(?:(?:if|while|for)\s*\(|do\b)/ && $line !~ /^.\s*#/ && $line !~ /\}\s*while\s*/) {
1957                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
1958                                 ctx_statement_block($linenr, $realcnt, 0)
1959                                         if (!defined $stat);
1960                         my ($s, $c) = ($stat, $cond);
1961
1962                         substr($s, 0, length($c), '');
1963
1964                         # Make sure we remove the line prefixes as we have
1965                         # none on the first line, and are going to readd them
1966                         # where necessary.
1967                         $s =~ s/\n./\n/gs;
1968
1969                         # Find out how long the conditional actually is.
1970                         my @newlines = ($c =~ /\n/gs);
1971                         my $cond_lines = 1 + $#newlines;
1972
1973                         # We want to check the first line inside the block
1974                         # starting at the end of the conditional, so remove:
1975                         #  1) any blank line termination
1976                         #  2) any opening brace { on end of the line
1977                         #  3) any do (...) {
1978                         my $continuation = 0;
1979                         my $check = 0;
1980                         $s =~ s/^.*\bdo\b//;
1981                         $s =~ s/^\s*{//;
1982                         if ($s =~ s/^\s*\\//) {
1983                                 $continuation = 1;
1984                         }
1985                         if ($s =~ s/^\s*?\n//) {
1986                                 $check = 1;
1987                                 $cond_lines++;
1988                         }
1989
1990                         # Also ignore a loop construct at the end of a
1991                         # preprocessor statement.
1992                         if (($prevline =~ /^.\s*#\s*define\s/ ||
1993                             $prevline =~ /\\\s*$/) && $continuation == 0) {
1994                                 $check = 0;
1995                         }
1996
1997                         my $cond_ptr = -1;
1998                         $continuation = 0;
1999                         while ($cond_ptr != $cond_lines) {
2000                                 $cond_ptr = $cond_lines;
2001
2002                                 # If we see an #else/#elif then the code
2003                                 # is not linear.
2004                                 if ($s =~ /^\s*\#\s*(?:else|elif)/) {
2005                                         $check = 0;
2006                                 }
2007
2008                                 # Ignore:
2009                                 #  1) blank lines, they should be at 0,
2010                                 #  2) preprocessor lines, and
2011                                 #  3) labels.
2012                                 if ($continuation ||
2013                                     $s =~ /^\s*?\n/ ||
2014                                     $s =~ /^\s*#\s*?/ ||
2015                                     $s =~ /^\s*$Ident\s*:/) {
2016                                         $continuation = ($s =~ /^.*?\\\n/) ? 1 : 0;
2017                                         if ($s =~ s/^.*?\n//) {
2018                                                 $cond_lines++;
2019                                         }
2020                                 }
2021                         }
2022
2023                         my (undef, $sindent) = line_stats("+" . $s);
2024                         my $stat_real = raw_line($linenr, $cond_lines);
2025
2026                         # Check if either of these lines are modified, else
2027                         # this is not this patch's fault.
2028                         if (!defined($stat_real) ||
2029                             $stat !~ /^\+/ && $stat_real !~ /^\+/) {
2030                                 $check = 0;
2031                         }
2032                         if (defined($stat_real) && $cond_lines > 1) {
2033                                 $stat_real = "[...]\n$stat_real";
2034                         }
2035
2036                         #print "line<$line> prevline<$prevline> indent<$indent> sindent<$sindent> check<$check> continuation<$continuation> s<$s> cond_lines<$cond_lines> stat_real<$stat_real> stat<$stat>\n";
2037
2038                         if ($check && (($sindent % 8) != 0 ||
2039                             ($sindent <= $indent && $s ne ''))) {
2040                                 WARN("SUSPECT_CODE_INDENT",
2041                                      "suspect code indent for conditional statements ($indent, $sindent)\n" . $herecurr . "$stat_real\n");
2042                         }
2043                 }
2044
2045                 # Track the 'values' across context and added lines.
2046                 my $opline = $line; $opline =~ s/^./ /;
2047                 my ($curr_values, $curr_vars) =
2048                                 annotate_values($opline . "\n", $prev_values);
2049                 $curr_values = $prev_values . $curr_values;
2050                 if ($dbg_values) {
2051                         my $outline = $opline; $outline =~ s/\t/ /g;
2052                         print "$linenr > .$outline\n";
2053                         print "$linenr > $curr_values\n";
2054                         print "$linenr >  $curr_vars\n";
2055                 }
2056                 $prev_values = substr($curr_values, -1);
2057
2058 #ignore lines not being added
2059                 if ($line=~/^[^\+]/) {next;}
2060
2061 # TEST: allow direct testing of the type matcher.
2062                 if ($dbg_type) {
2063                         if ($line =~ /^.\s*$Declare\s*$/) {
2064                                 ERROR("TEST_TYPE",
2065                                       "TEST: is type\n" . $herecurr);
2066                         } elsif ($dbg_type > 1 && $line =~ /^.+($Declare)/) {
2067                                 ERROR("TEST_NOT_TYPE",
2068                                       "TEST: is not type ($1 is)\n". $herecurr);
2069                         }
2070                         next;
2071                 }
2072 # TEST: allow direct testing of the attribute matcher.
2073                 if ($dbg_attr) {
2074                         if ($line =~ /^.\s*$Modifier\s*$/) {
2075                                 ERROR("TEST_ATTR",
2076                                       "TEST: is attr\n" . $herecurr);
2077                         } elsif ($dbg_attr > 1 && $line =~ /^.+($Modifier)/) {
2078                                 ERROR("TEST_NOT_ATTR",
2079                                       "TEST: is not attr ($1 is)\n". $herecurr);
2080                         }
2081                         next;
2082                 }
2083
2084 # check for initialisation to aggregates open brace on the next line
2085                 if ($line =~ /^.\s*{/ &&
2086                     $prevline =~ /(?:^|[^=])=\s*$/) {
2087                         ERROR("OPEN_BRACE",
2088                               "that open brace { should be on the previous line\n" . $hereprev);
2089                 }
2090
2091 #
2092 # Checks which are anchored on the added line.
2093 #
2094
2095 # check for malformed paths in #include statements (uses RAW line)
2096                 if ($rawline =~ m{^.\s*\#\s*include\s+[<"](.*)[">]}) {
2097                         my $path = $1;
2098                         if ($path =~ m{//}) {
2099                                 ERROR("MALFORMED_INCLUDE",
2100                                       "malformed #include filename\n" .
2101                                         $herecurr);
2102                         }
2103                 }
2104
2105 # no C99 // comments
2106                 if ($line =~ m{//}) {
2107                         ERROR("C99_COMMENTS",
2108                               "do not use C99 // comments\n" . $herecurr);
2109                 }
2110                 # Remove C99 comments.
2111                 $line =~ s@//.*@@;
2112                 $opline =~ s@//.*@@;
2113
2114 # EXPORT_SYMBOL should immediately follow the thing it is exporting, consider
2115 # the whole statement.
2116 #print "APW <$lines[$realline_next - 1]>\n";
2117                 if (defined $realline_next &&
2118                     exists $lines[$realline_next - 1] &&
2119                     !defined $suppress_export{$realline_next} &&
2120                     ($lines[$realline_next - 1] =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
2121                      $lines[$realline_next - 1] =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
2122                         # Handle definitions which produce identifiers with
2123                         # a prefix:
2124                         #   XXX(foo);
2125                         #   EXPORT_SYMBOL(something_foo);
2126                         my $name = $1;
2127                         if ($stat =~ /^.([A-Z_]+)\s*\(\s*($Ident)/ &&
2128                             $name =~ /^${Ident}_$2/) {
2129 #print "FOO C name<$name>\n";
2130                                 $suppress_export{$realline_next} = 1;
2131
2132                         } elsif ($stat !~ /(?:
2133                                 \n.}\s*$|
2134                                 ^.DEFINE_$Ident\(\Q$name\E\)|
2135                                 ^.DECLARE_$Ident\(\Q$name\E\)|
2136                                 ^.LIST_HEAD\(\Q$name\E\)|
2137                                 ^.(?:$Storage\s+)?$Type\s*\(\s*\*\s*\Q$name\E\s*\)\s*\(|
2138                                 \b\Q$name\E(?:\s+$Attribute)*\s*(?:;|=|\[|\()
2139                             )/x) {
2140 #print "FOO A<$lines[$realline_next - 1]> stat<$stat> name<$name>\n";
2141                                 $suppress_export{$realline_next} = 2;
2142                         } else {
2143                                 $suppress_export{$realline_next} = 1;
2144                         }
2145                 }
2146                 if (!defined $suppress_export{$linenr} &&
2147                     $prevline =~ /^.\s*$/ &&
2148                     ($line =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
2149                      $line =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
2150 #print "FOO B <$lines[$linenr - 1]>\n";
2151                         $suppress_export{$linenr} = 2;
2152                 }
2153                 if (defined $suppress_export{$linenr} &&
2154                     $suppress_export{$linenr} == 2) {
2155                         WARN("EXPORT_SYMBOL",
2156                              "EXPORT_SYMBOL(foo); should immediately follow its function/variable\n" . $herecurr);
2157                 }
2158
2159 # check for global initialisers.
2160                 if ($line =~ /^.$Type\s*$Ident\s*(?:\s+$Modifier)*\s*=\s*(0|NULL|false)\s*;/) {
2161                         ERROR("GLOBAL_INITIALISERS",
2162                               "do not initialise globals to 0 or NULL\n" .
2163                                 $herecurr);
2164                 }
2165 # check for static initialisers.
2166                 if ($line =~ /\bstatic\s.*=\s*(0|NULL|false)\s*;/) {
2167                         ERROR("INITIALISED_STATIC",
2168                               "do not initialise statics to 0 or NULL\n" .
2169                                 $herecurr);
2170                 }
2171
2172 # check for static const char * arrays.
2173                 if ($line =~ /\bstatic\s+const\s+char\s*\*\s*(\w+)\s*\[\s*\]\s*=\s*/) {
2174                         WARN("STATIC_CONST_CHAR_ARRAY",
2175                              "static const char * array should probably be static const char * const\n" .
2176                                 $herecurr);
2177                }
2178
2179 # check for static char foo[] = "bar" declarations.
2180                 if ($line =~ /\bstatic\s+char\s+(\w+)\s*\[\s*\]\s*=\s*"/) {
2181                         WARN("STATIC_CONST_CHAR_ARRAY",
2182                              "static char array declaration should probably be static const char\n" .
2183                                 $herecurr);
2184                }
2185
2186 # check for declarations of struct pci_device_id
2187                 if ($line =~ /\bstruct\s+pci_device_id\s+\w+\s*\[\s*\]\s*\=\s*\{/) {
2188                         WARN("DEFINE_PCI_DEVICE_TABLE",
2189                              "Use DEFINE_PCI_DEVICE_TABLE for struct pci_device_id\n" . $herecurr);
2190                 }
2191
2192 # check for new typedefs, only function parameters and sparse annotations
2193 # make sense.
2194                 if ($line =~ /\btypedef\s/ &&
2195                     $line !~ /\btypedef\s+$Type\s*\(\s*\*?$Ident\s*\)\s*\(/ &&
2196                     $line !~ /\btypedef\s+$Type\s+$Ident\s*\(/ &&
2197                     $line !~ /\b$typeTypedefs\b/ &&
2198                     $line !~ /\b__bitwise(?:__|)\b/) {
2199                         WARN("NEW_TYPEDEFS",
2200                              "do not add new typedefs\n" . $herecurr);
2201                 }
2202
2203 # * goes on variable not on type
2204                 # (char*[ const])
2205                 if ($line =~ m{\($NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)\)}) {
2206                         my ($from, $to) = ($1, $1);
2207
2208                         # Should start with a space.
2209                         $to =~ s/^(\S)/ $1/;
2210                         # Should not end with a space.
2211                         $to =~ s/\s+$//;
2212                         # '*'s should not have spaces between.
2213                         while ($to =~ s/\*\s+\*/\*\*/) {
2214                         }
2215
2216                         #print "from<$from> to<$to>\n";
2217                         if ($from ne $to) {
2218                                 ERROR("POINTER_LOCATION",
2219                                       "\"(foo$from)\" should be \"(foo$to)\"\n" .  $herecurr);
2220                         }
2221                 } elsif ($line =~ m{\b$NonptrType(\s*(?:$Modifier\b\s*|\*\s*)+)($Ident)}) {
2222                         my ($from, $to, $ident) = ($1, $1, $2);
2223
2224                         # Should start with a space.
2225                         $to =~ s/^(\S)/ $1/;
2226                         # Should not end with a space.
2227                         $to =~ s/\s+$//;
2228                         # '*'s should not have spaces between.
2229                         while ($to =~ s/\*\s+\*/\*\*/) {
2230                         }
2231                         # Modifiers should have spaces.
2232                         $to =~ s/(\b$Modifier$)/$1 /;
2233
2234                         #print "from<$from> to<$to> ident<$ident>\n";
2235                         if ($from ne $to && $ident !~ /^$Modifier$/) {
2236                                 ERROR("POINTER_LOCATION",
2237                                       "\"foo${from}bar\" should be \"foo${to}bar\"\n" .  $herecurr);
2238                         }
2239                 }
2240
2241 # # no BUG() or BUG_ON()
2242 #               if ($line =~ /\b(BUG|BUG_ON)\b/) {
2243 #                       print "Try to use WARN_ON & Recovery code rather than BUG() or BUG_ON()\n";
2244 #                       print "$herecurr";
2245 #                       $clean = 0;
2246 #               }
2247
2248                 if ($line =~ /\bLINUX_VERSION_CODE\b/) {
2249                         WARN("LINUX_VERSION_CODE",
2250                              "LINUX_VERSION_CODE should be avoided, code should be for the version to which it is merged\n" . $herecurr);
2251                 }
2252
2253 # check for uses of printk_ratelimit
2254                 if ($line =~ /\bprintk_ratelimit\s*\(/) {
2255                         WARN("PRINTK_RATELIMITED",
2256 "Prefer printk_ratelimited or pr_<level>_ratelimited to printk_ratelimit\n" . $herecurr);
2257                 }
2258
2259 # printk should use KERN_* levels.  Note that follow on printk's on the
2260 # same line do not need a level, so we use the current block context
2261 # to try and find and validate the current printk.  In summary the current
2262 # printk includes all preceding printk's which have no newline on the end.
2263 # we assume the first bad printk is the one to report.
2264                 if ($line =~ /\bprintk\((?!KERN_)\s*"/) {
2265                         my $ok = 0;
2266                         for (my $ln = $linenr - 1; $ln >= $first_line; $ln--) {
2267                                 #print "CHECK<$lines[$ln - 1]\n";
2268                                 # we have a preceding printk if it ends
2269                                 # with "\n" ignore it, else it is to blame
2270                                 if ($lines[$ln - 1] =~ m{\bprintk\(}) {
2271                                         if ($rawlines[$ln - 1] !~ m{\\n"}) {
2272                                                 $ok = 1;
2273                                         }
2274                                         last;
2275                                 }
2276                         }
2277                         if ($ok == 0) {
2278                                 WARN("PRINTK_WITHOUT_KERN_LEVEL",
2279                                      "printk() should include KERN_ facility level\n" . $herecurr);
2280                         }
2281                 }
2282
2283 # function brace can't be on same line, except for #defines of do while,
2284 # or if closed on same line
2285                 if (($line=~/$Type\s*$Ident\(.*\).*\s{/) and
2286                     !($line=~/\#\s*define.*do\s{/) and !($line=~/}/)) {
2287                         ERROR("OPEN_BRACE",
2288                               "open brace '{' following function declarations go on the next line\n" . $herecurr);
2289                 }
2290
2291 # open braces for enum, union and struct go on the same line.
2292                 if ($line =~ /^.\s*{/ &&
2293                     $prevline =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?\s*$/) {
2294                         ERROR("OPEN_BRACE",
2295                               "open brace '{' following $1 go on the same line\n" . $hereprev);
2296                 }
2297
2298 # missing space after union, struct or enum definition
2299                 if ($line =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(?:\s+$Ident)?(?:\s+$Ident)?[=\{]/) {
2300                     WARN("SPACING",
2301                          "missing space after $1 definition\n" . $herecurr);
2302                 }
2303
2304 # check for spacing round square brackets; allowed:
2305 #  1. with a type on the left -- int [] a;
2306 #  2. at the beginning of a line for slice initialisers -- [0...10] = 5,
2307 #  3. inside a curly brace -- = { [0...10] = 5 }
2308                 while ($line =~ /(.*?\s)\[/g) {
2309                         my ($where, $prefix) = ($-[1], $1);
2310                         if ($prefix !~ /$Type\s+$/ &&
2311                             ($where != 0 || $prefix !~ /^.\s+$/) &&
2312                             $prefix !~ /{\s+$/) {
2313                                 ERROR("BRACKET_SPACE",
2314                                       "space prohibited before open square bracket '['\n" . $herecurr);
2315                         }
2316                 }
2317
2318 # check for spaces between functions and their parentheses.
2319                 while ($line =~ /($Ident)\s+\(/g) {
2320                         my $name = $1;
2321                         my $ctx_before = substr($line, 0, $-[1]);
2322                         my $ctx = "$ctx_before$name";
2323
2324                         # Ignore those directives where spaces _are_ permitted.
2325                         if ($name =~ /^(?:
2326                                 if|for|while|switch|return|case|
2327                                 volatile|__volatile__|
2328                                 __attribute__|format|__extension__|
2329                                 asm|__asm__)$/x)
2330                         {
2331
2332                         # cpp #define statements have non-optional spaces, ie
2333                         # if there is a space between the name and the open
2334                         # parenthesis it is simply not a parameter group.
2335                         } elsif ($ctx_before =~ /^.\s*\#\s*define\s*$/) {
2336
2337                         # cpp #elif statement condition may start with a (
2338                         } elsif ($ctx =~ /^.\s*\#\s*elif\s*$/) {
2339
2340                         # If this whole things ends with a type its most
2341                         # likely a typedef for a function.
2342                         } elsif ($ctx =~ /$Type$/) {
2343
2344                         } else {
2345                                 WARN("SPACING",
2346                                      "space prohibited between function name and open parenthesis '('\n" . $herecurr);
2347                         }
2348                 }
2349 # Check operator spacing.
2350                 if (!($line=~/\#\s*include/)) {
2351                         my $ops = qr{
2352                                 <<=|>>=|<=|>=|==|!=|
2353                                 \+=|-=|\*=|\/=|%=|\^=|\|=|&=|
2354                                 =>|->|<<|>>|<|>|=|!|~|
2355                                 &&|\|\||,|\^|\+\+|--|&|\||\+|-|\*|\/|%|
2356                                 \?|:
2357                         }x;
2358                         my @elements = split(/($ops|;)/, $opline);
2359                         my $off = 0;
2360
2361                         my $blank = copy_spacing($opline);
2362
2363                         for (my $n = 0; $n < $#elements; $n += 2) {
2364                                 $off += length($elements[$n]);
2365
2366                                 # Pick up the preceding and succeeding characters.
2367                                 my $ca = substr($opline, 0, $off);
2368                                 my $cc = '';
2369                                 if (length($opline) >= ($off + length($elements[$n + 1]))) {
2370                                         $cc = substr($opline, $off + length($elements[$n + 1]));
2371                                 }
2372                                 my $cb = "$ca$;$cc";
2373
2374                                 my $a = '';
2375                                 $a = 'V' if ($elements[$n] ne '');
2376                                 $a = 'W' if ($elements[$n] =~ /\s$/);
2377                                 $a = 'C' if ($elements[$n] =~ /$;$/);
2378                                 $a = 'B' if ($elements[$n] =~ /(\[|\()$/);
2379                                 $a = 'O' if ($elements[$n] eq '');
2380                                 $a = 'E' if ($ca =~ /^\s*$/);
2381
2382                                 my $op = $elements[$n + 1];
2383
2384                                 my $c = '';
2385                                 if (defined $elements[$n + 2]) {
2386                                         $c = 'V' if ($elements[$n + 2] ne '');
2387                                         $c = 'W' if ($elements[$n + 2] =~ /^\s/);
2388                                         $c = 'C' if ($elements[$n + 2] =~ /^$;/);
2389                                         $c = 'B' if ($elements[$n + 2] =~ /^(\)|\]|;)/);
2390                                         $c = 'O' if ($elements[$n + 2] eq '');
2391                                         $c = 'E' if ($elements[$n + 2] =~ /^\s*\\$/);
2392                                 } else {
2393                                         $c = 'E';
2394                                 }
2395
2396                                 my $ctx = "${a}x${c}";
2397
2398                                 my $at = "(ctx:$ctx)";
2399
2400                                 my $ptr = substr($blank, 0, $off) . "^";
2401                                 my $hereptr = "$hereline$ptr\n";
2402
2403                                 # Pull out the value of this operator.
2404                                 my $op_type = substr($curr_values, $off + 1, 1);
2405
2406                                 # Get the full operator variant.
2407                                 my $opv = $op . substr($curr_vars, $off, 1);
2408
2409                                 # Ignore operators passed as parameters.
2410                                 if ($op_type ne 'V' &&
2411                                     $ca =~ /\s$/ && $cc =~ /^\s*,/) {
2412
2413 #                               # Ignore comments
2414 #                               } elsif ($op =~ /^$;+$/) {
2415
2416                                 # ; should have either the end of line or a space or \ after it
2417                                 } elsif ($op eq ';') {
2418                                         if ($ctx !~ /.x[WEBC]/ &&
2419                                             $cc !~ /^\\/ && $cc !~ /^;/) {
2420                                                 ERROR("SPACING",
2421                                                       "space required after that '$op' $at\n" . $hereptr);
2422                                         }
2423
2424                                 # // is a comment
2425                                 } elsif ($op eq '//') {
2426
2427                                 # No spaces for:
2428                                 #   ->
2429                                 #   :   when part of a bitfield
2430                                 } elsif ($op eq '->' || $opv eq ':B') {
2431                                         if ($ctx =~ /Wx.|.xW/) {
2432                                                 ERROR("SPACING",
2433                                                       "spaces prohibited around that '$op' $at\n" . $hereptr);
2434                                         }
2435
2436                                 # , must have a space on the right.
2437                                 } elsif ($op eq ',') {
2438                                         if ($ctx !~ /.x[WEC]/ && $cc !~ /^}/) {
2439                                                 ERROR("SPACING",
2440                                                       "space required after that '$op' $at\n" . $hereptr);
2441                                         }
2442
2443                                 # '*' as part of a type definition -- reported already.
2444                                 } elsif ($opv eq '*_') {
2445                                         #warn "'*' is part of type\n";
2446
2447                                 # unary operators should have a space before and
2448                                 # none after.  May be left adjacent to another
2449                                 # unary operator, or a cast
2450                                 } elsif ($op eq '!' || $op eq '~' ||
2451                                          $opv eq '*U' || $opv eq '-U' ||
2452                                          $opv eq '&U' || $opv eq '&&U') {
2453                                         if ($ctx !~ /[WEBC]x./ && $ca !~ /(?:\)|!|~|\*|-|\&|\||\+\+|\-\-|\{)$/) {
2454                                                 ERROR("SPACING",
2455                                                       "space required before that '$op' $at\n" . $hereptr);
2456                                         }
2457                                         if ($op eq '*' && $cc =~/\s*$Modifier\b/) {
2458                                                 # A unary '*' may be const
2459
2460                                         } elsif ($ctx =~ /.xW/) {
2461                                                 ERROR("SPACING",
2462                                                       "space prohibited after that '$op' $at\n" . $hereptr);
2463                                         }
2464
2465                                 # unary ++ and unary -- are allowed no space on one side.
2466                                 } elsif ($op eq '++' or $op eq '--') {
2467                                         if ($ctx !~ /[WEOBC]x[^W]/ && $ctx !~ /[^W]x[WOBEC]/) {
2468                                                 ERROR("SPACING",
2469                                                       "space required one side of that '$op' $at\n" . $hereptr);
2470                                         }
2471                                         if ($ctx =~ /Wx[BE]/ ||
2472                                             ($ctx =~ /Wx./ && $cc =~ /^;/)) {
2473                                                 ERROR("SPACING",
2474                                                       "space prohibited before that '$op' $at\n" . $hereptr);
2475                                         }
2476                                         if ($ctx =~ /ExW/) {
2477                                                 ERROR("SPACING",
2478                                                       "space prohibited after that '$op' $at\n" . $hereptr);
2479                                         }
2480
2481
2482                                 # << and >> may either have or not have spaces both sides
2483                                 } elsif ($op eq '<<' or $op eq '>>' or
2484                                          $op eq '&' or $op eq '^' or $op eq '|' or
2485                                          $op eq '+' or $op eq '-' or
2486                                          $op eq '*' or $op eq '/' or
2487                                          $op eq '%')
2488                                 {
2489                                         if ($ctx =~ /Wx[^WCE]|[^WCE]xW/) {
2490                                                 ERROR("SPACING",
2491                                                       "need consistent spacing around '$op' $at\n" .
2492                                                         $hereptr);
2493                                         }
2494
2495                                 # A colon needs no spaces before when it is
2496                                 # terminating a case value or a label.
2497                                 } elsif ($opv eq ':C' || $opv eq ':L') {
2498                                         if ($ctx =~ /Wx./) {
2499                                                 ERROR("SPACING",
2500                                                       "space prohibited before that '$op' $at\n" . $hereptr);
2501                                         }
2502
2503                                 # All the others need spaces both sides.
2504                                 } elsif ($ctx !~ /[EWC]x[CWE]/) {
2505                                         my $ok = 0;
2506
2507                                         # Ignore email addresses <foo@bar>
2508                                         if (($op eq '<' &&
2509                                              $cc =~ /^\S+\@\S+>/) ||
2510                                             ($op eq '>' &&
2511                                              $ca =~ /<\S+\@\S+$/))
2512                                         {
2513                                                 $ok = 1;
2514                                         }
2515
2516                                         # Ignore ?:
2517                                         if (($opv eq ':O' && $ca =~ /\?$/) ||
2518                                             ($op eq '?' && $cc =~ /^:/)) {
2519                                                 $ok = 1;
2520                                         }
2521
2522                                         if ($ok == 0) {
2523                                                 ERROR("SPACING",
2524                                                       "spaces required around that '$op' $at\n" . $hereptr);
2525                                         }
2526                                 }
2527                                 $off += length($elements[$n + 1]);
2528                         }
2529                 }
2530
2531 # check for multiple assignments
2532                 if ($line =~ /^.\s*$Lval\s*=\s*$Lval\s*=(?!=)/) {
2533                         CHK("MULTIPLE_ASSIGNMENTS",
2534                             "multiple assignments should be avoided\n" . $herecurr);
2535                 }
2536
2537 ## # check for multiple declarations, allowing for a function declaration
2538 ## # continuation.
2539 ##              if ($line =~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Ident.*/ &&
2540 ##                  $line !~ /^.\s*$Type\s+$Ident(?:\s*=[^,{]*)?\s*,\s*$Type\s*$Ident.*/) {
2541 ##
2542 ##                      # Remove any bracketed sections to ensure we do not
2543 ##                      # falsly report the parameters of functions.
2544 ##                      my $ln = $line;
2545 ##                      while ($ln =~ s/\([^\(\)]*\)//g) {
2546 ##                      }
2547 ##                      if ($ln =~ /,/) {
2548 ##                              WARN("MULTIPLE_DECLARATION",
2549 ##                                   "declaring multiple variables together should be avoided\n" . $herecurr);
2550 ##                      }
2551 ##              }
2552
2553 #need space before brace following if, while, etc
2554                 if (($line =~ /\(.*\){/ && $line !~ /\($Type\){/) ||
2555                     $line =~ /do{/) {
2556                         ERROR("SPACING",
2557                               "space required before the open brace '{'\n" . $herecurr);
2558                 }
2559
2560 # closing brace should have a space following it when it has anything
2561 # on the line
2562                 if ($line =~ /}(?!(?:,|;|\)))\S/) {
2563                         ERROR("SPACING",
2564                               "space required after that close brace '}'\n" . $herecurr);
2565                 }
2566
2567 # check spacing on square brackets
2568                 if ($line =~ /\[\s/ && $line !~ /\[\s*$/) {
2569                         ERROR("SPACING",
2570                               "space prohibited after that open square bracket '['\n" . $herecurr);
2571                 }
2572                 if ($line =~ /\s\]/) {
2573                         ERROR("SPACING",
2574                               "space prohibited before that close square bracket ']'\n" . $herecurr);
2575                 }
2576
2577 # check spacing on parentheses
2578                 if ($line =~ /\(\s/ && $line !~ /\(\s*(?:\\)?$/ &&
2579                     $line !~ /for\s*\(\s+;/) {
2580                         ERROR("SPACING",
2581                               "space prohibited after that open parenthesis '('\n" . $herecurr);
2582                 }
2583                 if ($line =~ /(\s+)\)/ && $line !~ /^.\s*\)/ &&
2584                     $line !~ /for\s*\(.*;\s+\)/ &&
2585                     $line !~ /:\s+\)/) {
2586                         ERROR("SPACING",
2587                               "space prohibited before that close parenthesis ')'\n" . $herecurr);
2588                 }
2589
2590 #goto labels aren't indented, allow a single space however
2591                 if ($line=~/^.\s+[A-Za-z\d_]+:(?![0-9]+)/ and
2592                    !($line=~/^. [A-Za-z\d_]+:/) and !($line=~/^.\s+default:/)) {
2593                         WARN("INDENTED_LABEL",
2594                              "labels should not be indented\n" . $herecurr);
2595                 }
2596
2597 # Return is not a function.
2598                 if (defined($stat) && $stat =~ /^.\s*return(\s*)(\(.*);/s) {
2599                         my $spacing = $1;
2600                         my $value = $2;
2601
2602                         # Flatten any parentheses
2603                         $value =~ s/\(/ \(/g;
2604                         $value =~ s/\)/\) /g;
2605                         while ($value =~ s/\[[^\{\}]*\]/1/ ||
2606                                $value !~ /(?:$Ident|-?$Constant)\s*
2607                                              $Compare\s*
2608                                              (?:$Ident|-?$Constant)/x &&
2609                                $value =~ s/\([^\(\)]*\)/1/) {
2610                         }
2611 #print "value<$value>\n";
2612                         if ($value =~ /^\s*(?:$Ident|-?$Constant)\s*$/) {
2613                                 ERROR("RETURN_PARENTHESES",
2614                                       "return is not a function, parentheses are not required\n" . $herecurr);
2615
2616                         } elsif ($spacing !~ /\s+/) {
2617                                 ERROR("SPACING",
2618                                       "space required before the open parenthesis '('\n" . $herecurr);
2619                         }
2620                 }
2621 # Return of what appears to be an errno should normally be -'ve
2622                 if ($line =~ /^.\s*return\s*(E[A-Z]*)\s*;/) {
2623                         my $name = $1;
2624                         if ($name ne 'EOF' && $name ne 'ERROR') {
2625                                 WARN("USE_NEGATIVE_ERRNO",
2626                                      "return of an errno should typically be -ve (return -$1)\n" . $herecurr);
2627                         }
2628                 }
2629
2630 # Need a space before open parenthesis after if, while etc
2631                 if ($line=~/\b(if|while|for|switch)\(/) {
2632                         ERROR("SPACING", "space required before the open parenthesis '('\n" . $herecurr);
2633                 }
2634
2635 # Check for illegal assignment in if conditional -- and check for trailing
2636 # statements after the conditional.
2637                 if ($line =~ /do\s*(?!{)/) {
2638                         ($stat, $cond, $line_nr_next, $remain_next, $off_next) =
2639                                 ctx_statement_block($linenr, $realcnt, 0)
2640                                         if (!defined $stat);
2641                         my ($stat_next) = ctx_statement_block($line_nr_next,
2642                                                 $remain_next, $off_next);
2643                         $stat_next =~ s/\n./\n /g;
2644                         ##print "stat<$stat> stat_next<$stat_next>\n";
2645
2646                         if ($stat_next =~ /^\s*while\b/) {
2647                                 # If the statement carries leading newlines,
2648                                 # then count those as offsets.
2649                                 my ($whitespace) =
2650                                         ($stat_next =~ /^((?:\s*\n[+-])*\s*)/s);
2651                                 my $offset =
2652                                         statement_rawlines($whitespace) - 1;
2653
2654                                 $suppress_whiletrailers{$line_nr_next +
2655                                                                 $offset} = 1;
2656                         }
2657                 }
2658                 if (!defined $suppress_whiletrailers{$linenr} &&
2659                     $line =~ /\b(?:if|while|for)\s*\(/ && $line !~ /^.\s*#/) {
2660                         my ($s, $c) = ($stat, $cond);
2661
2662                         if ($c =~ /\bif\s*\(.*[^<>!=]=[^=].*/s) {
2663                                 ERROR("ASSIGN_IN_IF",
2664                                       "do not use assignment in if condition\n" . $herecurr);
2665                         }
2666
2667                         # Find out what is on the end of the line after the
2668                         # conditional.
2669                         substr($s, 0, length($c), '');
2670                         $s =~ s/\n.*//g;
2671                         $s =~ s/$;//g;  # Remove any comments
2672                         if (length($c) && $s !~ /^\s*{?\s*\\*\s*$/ &&
2673                             $c !~ /}\s*while\s*/)
2674                         {
2675                                 # Find out how long the conditional actually is.
2676                                 my @newlines = ($c =~ /\n/gs);
2677                                 my $cond_lines = 1 + $#newlines;
2678                                 my $stat_real = '';
2679
2680                                 $stat_real = raw_line($linenr, $cond_lines)
2681                                                         . "\n" if ($cond_lines);
2682                                 if (defined($stat_real) && $cond_lines > 1) {
2683                                         $stat_real = "[...]\n$stat_real";
2684                                 }
2685
2686                                 ERROR("TRAILING_STATEMENTS",
2687                                       "trailing statements should be on next line\n" . $herecurr . $stat_real);
2688                         }
2689                 }
2690
2691 # Check for bitwise tests written as boolean
2692                 if ($line =~ /
2693                         (?:
2694                                 (?:\[|\(|\&\&|\|\|)
2695                                 \s*0[xX][0-9]+\s*
2696                                 (?:\&\&|\|\|)
2697                         |
2698                                 (?:\&\&|\|\|)
2699                                 \s*0[xX][0-9]+\s*
2700                                 (?:\&\&|\|\||\)|\])
2701                         )/x)
2702                 {
2703                         WARN("HEXADECIMAL_BOOLEAN_TEST",
2704                              "boolean test with hexadecimal, perhaps just 1 \& or \|?\n" . $herecurr);
2705                 }
2706
2707 # if and else should not have general statements after it
2708                 if ($line =~ /^.\s*(?:}\s*)?else\b(.*)/) {
2709                         my $s = $1;
2710                         $s =~ s/$;//g;  # Remove any comments
2711                         if ($s !~ /^\s*(?:\sif|(?:{|)\s*\\?\s*$)/) {
2712                                 ERROR("TRAILING_STATEMENTS",
2713                                       "trailing statements should be on next line\n" . $herecurr);
2714                         }
2715                 }
2716 # if should not continue a brace
2717                 if ($line =~ /}\s*if\b/) {
2718                         ERROR("TRAILING_STATEMENTS",
2719                               "trailing statements should be on next line\n" .
2720                                 $herecurr);
2721                 }
2722 # case and default should not have general statements after them
2723                 if ($line =~ /^.\s*(?:case\s*.*|default\s*):/g &&
2724                     $line !~ /\G(?:
2725                         (?:\s*$;*)(?:\s*{)?(?:\s*$;*)(?:\s*\\)?\s*$|
2726                         \s*return\s+
2727                     )/xg)
2728                 {
2729                         ERROR("TRAILING_STATEMENTS",
2730                               "trailing statements should be on next line\n" . $herecurr);
2731                 }
2732
2733                 # Check for }<nl>else {, these must be at the same
2734                 # indent level to be relevant to each other.
2735                 if ($prevline=~/}\s*$/ and $line=~/^.\s*else\s*/ and
2736                                                 $previndent == $indent) {
2737                         ERROR("ELSE_AFTER_BRACE",
2738                               "else should follow close brace '}'\n" . $hereprev);
2739                 }
2740
2741                 if ($prevline=~/}\s*$/ and $line=~/^.\s*while\s*/ and
2742                                                 $previndent == $indent) {
2743                         my ($s, $c) = ctx_statement_block($linenr, $realcnt, 0);
2744
2745                         # Find out what is on the end of the line after the
2746                         # conditional.
2747                         substr($s, 0, length($c), '');
2748                         $s =~ s/\n.*//g;
2749
2750                         if ($s =~ /^\s*;/) {
2751                                 ERROR("WHILE_AFTER_BRACE",
2752                                       "while should follow close brace '}'\n" . $hereprev);
2753                         }
2754                 }
2755
2756 #studly caps, commented out until figure out how to distinguish between use of existing and adding new
2757 #               if (($line=~/[\w_][a-z\d]+[A-Z]/) and !($line=~/print/)) {
2758 #                   print "No studly caps, use _\n";
2759 #                   print "$herecurr";
2760 #                   $clean = 0;
2761 #               }
2762
2763 #no spaces allowed after \ in define
2764                 if ($line=~/\#\s*define.*\\\s$/) {
2765                         WARN("WHITESPACE_AFTER_LINE_CONTINUATION",
2766                              "Whitepspace after \\ makes next lines useless\n" . $herecurr);
2767                 }
2768
2769 #warn if <asm/foo.h> is #included and <linux/foo.h> is available (uses RAW line)
2770                 if ($tree && $rawline =~ m{^.\s*\#\s*include\s*\<asm\/(.*)\.h\>}) {
2771                         my $file = "$1.h";
2772                         my $checkfile = "include/linux/$file";
2773                         if (-f "$root/$checkfile" &&
2774                             $realfile ne $checkfile &&
2775                             $1 !~ /$allowed_asm_includes/)
2776                         {
2777                                 if ($realfile =~ m{^arch/}) {
2778                                         CHK("ARCH_INCLUDE_LINUX",
2779                                             "Consider using #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
2780                                 } else {
2781                                         WARN("INCLUDE_LINUX",
2782                                              "Use #include <linux/$file> instead of <asm/$file>\n" . $herecurr);
2783                                 }
2784                         }
2785                 }
2786
2787 # multi-statement macros should be enclosed in a do while loop, grab the
2788 # first statement and ensure its the whole macro if its not enclosed
2789 # in a known good container
2790                 if ($realfile !~ m@/vmlinux.lds.h$@ &&
2791                     $line =~ /^.\s*\#\s*define\s*$Ident(\()?/) {
2792                         my $ln = $linenr;
2793                         my $cnt = $realcnt;
2794                         my ($off, $dstat, $dcond, $rest);
2795                         my $ctx = '';
2796                         ($dstat, $dcond, $ln, $cnt, $off) =
2797                                 ctx_statement_block($linenr, $realcnt, 0);
2798                         $ctx = $dstat;
2799                         #print "dstat<$dstat> dcond<$dcond> cnt<$cnt> off<$off>\n";
2800                         #print "LINE<$lines[$ln-1]> len<" . length($lines[$ln-1]) . "\n";
2801
2802                         $dstat =~ s/^.\s*\#\s*define\s+$Ident(?:\([^\)]*\))?\s*//;
2803                         $dstat =~ s/$;//g;
2804                         $dstat =~ s/\\\n.//g;
2805                         $dstat =~ s/^\s*//s;
2806                         $dstat =~ s/\s*$//s;
2807
2808                         # Flatten any parentheses and braces
2809                         while ($dstat =~ s/\([^\(\)]*\)/1/ ||
2810                                $dstat =~ s/\{[^\{\}]*\}/1/ ||
2811                                $dstat =~ s/\[[^\{\}]*\]/1/)
2812                         {
2813                         }
2814
2815                         my $exceptions = qr{
2816                                 $Declare|
2817                                 module_param_named|
2818                                 MODULE_PARAM_DESC|
2819                                 DECLARE_PER_CPU|
2820                                 DEFINE_PER_CPU|
2821                                 __typeof__\(|
2822                                 union|
2823                                 struct|
2824                                 \.$Ident\s*=\s*|
2825                                 ^\"|\"$
2826                         }x;
2827                         #print "REST<$rest> dstat<$dstat> ctx<$ctx>\n";
2828                         if ($dstat ne '' &&
2829                             $dstat !~ /^(?:$Ident|-?$Constant),$/ &&                    # 10, // foo(),
2830                             $dstat !~ /^(?:$Ident|-?$Constant);$/ &&                    # foo();
2831                             $dstat !~ /^(?:$Ident|-?$Constant)$/ &&                     # 10 // foo()
2832                             $dstat !~ /$exceptions/ &&
2833                             $dstat !~ /^\.$Ident\s*=/ &&                                # .foo =
2834                             $dstat !~ /^do\s*$Constant\s*while\s*$Constant;$/ &&        # do {...} while (...);
2835                             $dstat !~ /^for\s*$Constant$/ &&                            # for (...)
2836                             $dstat !~ /^for\s*$Constant\s+(?:$Ident|-?$Constant)$/ &&   # for (...) bar()
2837                             $dstat !~ /^do\s*{/ &&                                      # do {...
2838                             $dstat !~ /^\({/)                                           # ({...
2839                         {
2840                                 $ctx =~ s/\n*$//;
2841                                 my $herectx = $here . "\n";
2842                                 my $cnt = statement_rawlines($ctx);
2843
2844                                 for (my $n = 0; $n < $cnt; $n++) {
2845                                         $herectx .= raw_line($linenr, $n) . "\n";
2846                                 }
2847
2848                                 if ($dstat =~ /;/) {
2849                                         ERROR("MULTISTATEMENT_MACRO_USE_DO_WHILE",
2850                                               "Macros with multiple statements should be enclosed in a do - while loop\n" . "$herectx");
2851                                 } else {
2852                                         ERROR("COMPLEX_MACRO",
2853                                               "Macros with complex values should be enclosed in parenthesis\n" . "$herectx");
2854                                 }
2855                         }
2856                 }
2857
2858 # make sure symbols are always wrapped with VMLINUX_SYMBOL() ...
2859 # all assignments may have only one of the following with an assignment:
2860 #       .
2861 #       ALIGN(...)
2862 #       VMLINUX_SYMBOL(...)
2863                 if ($realfile eq 'vmlinux.lds.h' && $line =~ /(?:(?:^|\s)$Ident\s*=|=\s*$Ident(?:\s|$))/) {
2864                         WARN("MISSING_VMLINUX_SYMBOL",
2865                              "vmlinux.lds.h needs VMLINUX_SYMBOL() around C-visible symbols\n" . $herecurr);
2866                 }
2867
2868 # check for redundant bracing round if etc
2869                 if ($line =~ /(^.*)\bif\b/ && $1 !~ /else\s*$/) {
2870                         my ($level, $endln, @chunks) =
2871                                 ctx_statement_full($linenr, $realcnt, 1);
2872                         #print "chunks<$#chunks> linenr<$linenr> endln<$endln> level<$level>\n";
2873                         #print "APW: <<$chunks[1][0]>><<$chunks[1][1]>>\n";
2874                         if ($#chunks > 0 && $level == 0) {
2875                                 my $allowed = 0;
2876                                 my $seen = 0;
2877                                 my $herectx = $here . "\n";
2878                                 my $ln = $linenr - 1;
2879                                 for my $chunk (@chunks) {
2880                                         my ($cond, $block) = @{$chunk};
2881
2882                                         # If the condition carries leading newlines, then count those as offsets.
2883                                         my ($whitespace) = ($cond =~ /^((?:\s*\n[+-])*\s*)/s);
2884                                         my $offset = statement_rawlines($whitespace) - 1;
2885
2886                                         #print "COND<$cond> whitespace<$whitespace> offset<$offset>\n";
2887
2888                                         # We have looked at and allowed this specific line.
2889                                         $suppress_ifbraces{$ln + $offset} = 1;
2890
2891                                         $herectx .= "$rawlines[$ln + $offset]\n[...]\n";
2892                                         $ln += statement_rawlines($block) - 1;
2893
2894                                         substr($block, 0, length($cond), '');
2895
2896                                         $seen++ if ($block =~ /^\s*{/);
2897
2898                                         #print "cond<$cond> block<$block> allowed<$allowed>\n";
2899                                         if (statement_lines($cond) > 1) {
2900                                                 #print "APW: ALLOWED: cond<$cond>\n";
2901                                                 $allowed = 1;
2902                                         }
2903                                         if ($block =~/\b(?:if|for|while)\b/) {
2904                                                 #print "APW: ALLOWED: block<$block>\n";
2905                                                 $allowed = 1;
2906                                         }
2907                                         if (statement_block_size($block) > 1) {
2908                                                 #print "APW: ALLOWED: lines block<$block>\n";
2909                                                 $allowed = 1;
2910                                         }
2911                                 }
2912                                 if ($seen && !$allowed) {
2913                                         WARN("BRACES",
2914                                              "braces {} are not necessary for any arm of this statement\n" . $herectx);
2915                                 }
2916                         }
2917                 }
2918                 if (!defined $suppress_ifbraces{$linenr - 1} &&
2919                                         $line =~ /\b(if|while|for|else)\b/) {
2920                         my $allowed = 0;
2921
2922                         # Check the pre-context.
2923                         if (substr($line, 0, $-[0]) =~ /(\}\s*)$/) {
2924                                 #print "APW: ALLOWED: pre<$1>\n";
2925                                 $allowed = 1;
2926                         }
2927
2928                         my ($level, $endln, @chunks) =
2929                                 ctx_statement_full($linenr, $realcnt, $-[0]);
2930
2931                         # Check the condition.
2932                         my ($cond, $block) = @{$chunks[0]};
2933                         #print "CHECKING<$linenr> cond<$cond> block<$block>\n";
2934                         if (defined $cond) {
2935                                 substr($block, 0, length($cond), '');
2936                         }
2937                         if (statement_lines($cond) > 1) {
2938                                 #print "APW: ALLOWED: cond<$cond>\n";
2939                                 $allowed = 1;
2940                         }
2941                         if ($block =~/\b(?:if|for|while)\b/) {
2942                                 #print "APW: ALLOWED: block<$block>\n";
2943                                 $allowed = 1;
2944                         }
2945                         if (statement_block_size($block) > 1) {
2946                                 #print "APW: ALLOWED: lines block<$block>\n";
2947                                 $allowed = 1;
2948                         }
2949                         # Check the post-context.
2950                         if (defined $chunks[1]) {
2951                                 my ($cond, $block) = @{$chunks[1]};
2952                                 if (defined $cond) {
2953                                         substr($block, 0, length($cond), '');
2954                                 }
2955                                 if ($block =~ /^\s*\{/) {
2956                                         #print "APW: ALLOWED: chunk-1 block<$block>\n";
2957                                         $allowed = 1;
2958                                 }
2959                         }
2960                         if ($level == 0 && $block =~ /^\s*\{/ && !$allowed) {
2961                                 my $herectx = $here . "\n";
2962                                 my $cnt = statement_rawlines($block);
2963
2964                                 for (my $n = 0; $n < $cnt; $n++) {
2965                                         $herectx .= raw_line($linenr, $n) . "\n";
2966                                 }
2967
2968                                 WARN("BRACES",
2969                                      "braces {} are not necessary for single statement blocks\n" . $herectx);
2970                         }
2971                 }
2972
2973 # don't include deprecated include files (uses RAW line)
2974                 for my $inc (@dep_includes) {
2975                         if ($rawline =~ m@^.\s*\#\s*include\s*\<$inc>@) {
2976                                 ERROR("DEPRECATED_INCLUDE",
2977                                       "Don't use <$inc>: see Documentation/feature-removal-schedule.txt\n" . $herecurr);
2978                         }
2979                 }
2980
2981 # don't use deprecated functions
2982                 for my $func (@dep_functions) {
2983                         if ($line =~ /\b$func\b/) {
2984                                 ERROR("DEPRECATED_FUNCTION",
2985                                       "Don't use $func(): see Documentation/feature-removal-schedule.txt\n" . $herecurr);
2986                         }
2987                 }
2988
2989 # no volatiles please
2990                 my $asm_volatile = qr{\b(__asm__|asm)\s+(__volatile__|volatile)\b};
2991                 if ($line =~ /\bvolatile\b/ && $line !~ /$asm_volatile/) {
2992                         WARN("VOLATILE",
2993                              "Use of volatile is usually wrong: see Documentation/volatile-considered-harmful.txt\n" . $herecurr);
2994                 }
2995
2996 # warn about #if 0
2997                 if ($line =~ /^.\s*\#\s*if\s+0\b/) {
2998                         CHK("REDUNDANT_CODE",
2999                             "if this code is redundant consider removing it\n" .
3000                                 $herecurr);
3001                 }
3002
3003 # check for needless kfree() checks
3004                 if ($prevline =~ /\bif\s*\(([^\)]*)\)/) {
3005                         my $expr = $1;
3006                         if ($line =~ /\bkfree\(\Q$expr\E\);/) {
3007                                 WARN("NEEDLESS_KFREE",
3008                                      "kfree(NULL) is safe this check is probably not required\n" . $hereprev);
3009                         }
3010                 }
3011 # check for needless usb_free_urb() checks
3012                 if ($prevline =~ /\bif\s*\(([^\)]*)\)/) {
3013                         my $expr = $1;
3014                         if ($line =~ /\busb_free_urb\(\Q$expr\E\);/) {
3015                                 WARN("NEEDLESS_USB_FREE_URB",
3016                                      "usb_free_urb(NULL) is safe this check is probably not required\n" . $hereprev);
3017                         }
3018                 }
3019
3020 # prefer usleep_range over udelay
3021                 if ($line =~ /\budelay\s*\(\s*(\w+)\s*\)/) {
3022                         # ignore udelay's < 10, however
3023                         if (! (($1 =~ /(\d+)/) && ($1 < 10)) ) {
3024                                 CHK("USLEEP_RANGE",
3025                                     "usleep_range is preferred over udelay; see Documentation/timers/timers-howto.txt\n" . $line);
3026                         }
3027                 }
3028
3029 # warn about unexpectedly long msleep's
3030                 if ($line =~ /\bmsleep\s*\((\d+)\);/) {
3031                         if ($1 < 20) {
3032                                 WARN("MSLEEP",
3033                                      "msleep < 20ms can sleep for up to 20ms; see Documentation/timers/timers-howto.txt\n" . $line);
3034                         }
3035                 }
3036
3037 # warn about #ifdefs in C files
3038 #               if ($line =~ /^.\s*\#\s*if(|n)def/ && ($realfile =~ /\.c$/)) {
3039 #                       print "#ifdef in C files should be avoided\n";
3040 #                       print "$herecurr";
3041 #                       $clean = 0;
3042 #               }
3043
3044 # warn about spacing in #ifdefs
3045                 if ($line =~ /^.\s*\#\s*(ifdef|ifndef|elif)\s\s+/) {
3046                         ERROR("SPACING",
3047                               "exactly one space required after that #$1\n" . $herecurr);
3048                 }
3049
3050 # check for spinlock_t definitions without a comment.
3051                 if ($line =~ /^.\s*(struct\s+mutex|spinlock_t)\s+\S+;/ ||
3052                     $line =~ /^.\s*(DEFINE_MUTEX)\s*\(/) {
3053                         my $which = $1;
3054                         if (!ctx_has_comment($first_line, $linenr)) {
3055                                 CHK("UNCOMMENTED_DEFINITION",
3056                                     "$1 definition without comment\n" . $herecurr);
3057                         }
3058                 }
3059 # check for memory barriers without a comment.
3060                 if ($line =~ /\b(mb|rmb|wmb|read_barrier_depends|smp_mb|smp_rmb|smp_wmb|smp_read_barrier_depends)\(/) {
3061                         if (!ctx_has_comment($first_line, $linenr)) {
3062                                 CHK("MEMORY_BARRIER",
3063                                     "memory barrier without comment\n" . $herecurr);
3064                         }
3065                 }
3066 # check of hardware specific defines
3067                 if ($line =~ m@^.\s*\#\s*if.*\b(__i386__|__powerpc64__|__sun__|__s390x__)\b@ && $realfile !~ m@include/asm-@) {
3068                         CHK("ARCH_DEFINES",
3069                             "architecture specific defines should be avoided\n" .  $herecurr);
3070                 }
3071
3072 # Check that the storage class is at the beginning of a declaration
3073                 if ($line =~ /\b$Storage\b/ && $line !~ /^.\s*$Storage\b/) {
3074                         WARN("STORAGE_CLASS",
3075                              "storage class should be at the beginning of the declaration\n" . $herecurr)
3076                 }
3077
3078 # check the location of the inline attribute, that it is between
3079 # storage class and type.
3080                 if ($line =~ /\b$Type\s+$Inline\b/ ||
3081                     $line =~ /\b$Inline\s+$Storage\b/) {
3082                         ERROR("INLINE_LOCATION",
3083                               "inline keyword should sit between storage class and type\n" . $herecurr);
3084                 }
3085
3086 # Check for __inline__ and __inline, prefer inline
3087                 if ($line =~ /\b(__inline__|__inline)\b/) {
3088                         WARN("INLINE",
3089                              "plain inline is preferred over $1\n" . $herecurr);
3090                 }
3091
3092 # Check for __attribute__ packed, prefer __packed
3093                 if ($line =~ /\b__attribute__\s*\(\s*\(.*\bpacked\b/) {
3094                         WARN("PREFER_PACKED",
3095                              "__packed is preferred over __attribute__((packed))\n" . $herecurr);
3096                 }
3097
3098 # Check for __attribute__ aligned, prefer __aligned
3099                 if ($line =~ /\b__attribute__\s*\(\s*\(.*aligned/) {
3100                         WARN("PREFER_ALIGNED",
3101                              "__aligned(size) is preferred over __attribute__((aligned(size)))\n" . $herecurr);
3102                 }
3103
3104 # Check for __attribute__ format(printf, prefer __printf
3105                 if ($line =~ /\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf/) {
3106                         WARN("PREFER_PRINTF",
3107                              "__printf(string-index, first-to-check) is preferred over __attribute__((format(printf, string-index, first-to-check)))\n" . $herecurr);
3108                 }
3109
3110 # check for sizeof(&)
3111                 if ($line =~ /\bsizeof\s*\(\s*\&/) {
3112                         WARN("SIZEOF_ADDRESS",
3113                              "sizeof(& should be avoided\n" . $herecurr);
3114                 }
3115
3116 # check for line continuations in quoted strings with odd counts of "
3117                 if ($rawline =~ /\\$/ && $rawline =~ tr/"/"/ % 2) {
3118                         WARN("LINE_CONTINUATIONS",
3119                              "Avoid line continuations in quoted strings\n" . $herecurr);
3120                 }
3121
3122 # Check for misused memsets
3123                 if (defined $stat &&
3124                     $stat =~ /^\+(?:.*?)\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*$FuncArg\s*\)/s) {
3125
3126                         my $ms_addr = $2;
3127                         my $ms_val = $8;
3128                         my $ms_size = $14;
3129
3130                         if ($ms_size =~ /^(0x|)0$/i) {
3131                                 ERROR("MEMSET",
3132                                       "memset to 0's uses 0 as the 2nd argument, not the 3rd\n" . "$here\n$stat\n");
3133                         } elsif ($ms_size =~ /^(0x|)1$/i) {
3134                                 WARN("MEMSET",
3135                                      "single byte memset is suspicious. Swapped 2nd/3rd argument?\n" . "$here\n$stat\n");
3136                         }
3137                 }
3138
3139 # typecasts on min/max could be min_t/max_t
3140                 if (defined $stat &&
3141                     $stat =~ /^\+(?:.*?)\b(min|max)\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\)/) {
3142                         if (defined $2 || defined $8) {
3143                                 my $call = $1;
3144                                 my $cast1 = deparenthesize($2);
3145                                 my $arg1 = $3;
3146                                 my $cast2 = deparenthesize($8);
3147                                 my $arg2 = $9;
3148                                 my $cast;
3149
3150                                 if ($cast1 ne "" && $cast2 ne "") {
3151                                         $cast = "$cast1 or $cast2";
3152                                 } elsif ($cast1 ne "") {
3153                                         $cast = $cast1;
3154                                 } else {
3155                                         $cast = $cast2;
3156                                 }
3157                                 WARN("MINMAX",
3158                                      "$call() should probably be ${call}_t($cast, $arg1, $arg2)\n" . "$here\n$stat\n");
3159                         }
3160                 }
3161
3162 # check for new externs in .c files.
3163                 if ($realfile =~ /\.c$/ && defined $stat &&
3164                     $stat =~ /^.\s*(?:extern\s+)?$Type\s+($Ident)(\s*)\(/s)
3165                 {
3166                         my $function_name = $1;
3167                         my $paren_space = $2;
3168
3169                         my $s = $stat;
3170                         if (defined $cond) {
3171                                 substr($s, 0, length($cond), '');
3172                         }
3173                         if ($s =~ /^\s*;/ &&
3174                             $function_name ne 'uninitialized_var')
3175                         {
3176                                 WARN("AVOID_EXTERNS",
3177                                      "externs should be avoided in .c files\n" .  $herecurr);
3178                         }
3179
3180                         if ($paren_space =~ /\n/) {
3181                                 WARN("FUNCTION_ARGUMENTS",
3182                                      "arguments for function declarations should follow identifier\n" . $herecurr);
3183                         }
3184
3185                 } elsif ($realfile =~ /\.c$/ && defined $stat &&
3186                     $stat =~ /^.\s*extern\s+/)
3187                 {
3188                         WARN("AVOID_EXTERNS",
3189                              "externs should be avoided in .c files\n" .  $herecurr);
3190                 }
3191
3192 # checks for new __setup's
3193                 if ($rawline =~ /\b__setup\("([^"]*)"/) {
3194                         my $name = $1;
3195
3196                         if (!grep(/$name/, @setup_docs)) {
3197                                 CHK("UNDOCUMENTED_SETUP",
3198                                     "__setup appears un-documented -- check Documentation/kernel-parameters.txt\n" . $herecurr);
3199                         }
3200                 }
3201
3202 # check for pointless casting of kmalloc return
3203                 if ($line =~ /\*\s*\)\s*[kv][czm]alloc(_node){0,1}\b/) {
3204                         WARN("UNNECESSARY_CASTS",
3205                              "unnecessary cast may hide bugs, see http://c-faq.com/malloc/mallocnocast.html\n" . $herecurr);
3206                 }
3207
3208 # check for multiple semicolons
3209                 if ($line =~ /;\s*;\s*$/) {
3210                     WARN("ONE_SEMICOLON",
3211                          "Statements terminations use 1 semicolon\n" . $herecurr);
3212                 }
3213
3214 # check for gcc specific __FUNCTION__
3215                 if ($line =~ /__FUNCTION__/) {
3216                         WARN("USE_FUNC",
3217                              "__func__ should be used instead of gcc specific __FUNCTION__\n"  . $herecurr);
3218                 }
3219
3220 # check for semaphores initialized locked
3221                 if ($line =~ /^.\s*sema_init.+,\W?0\W?\)/) {
3222                         WARN("CONSIDER_COMPLETION",
3223                              "consider using a completion\n" . $herecurr);
3224
3225                 }
3226 # recommend kstrto* over simple_strto* and strict_strto*
3227                 if ($line =~ /\b((simple|strict)_(strto(l|ll|ul|ull)))\s*\(/) {
3228                         WARN("CONSIDER_KSTRTO",
3229                              "$1 is obsolete, use k$3 instead\n" . $herecurr);
3230                 }
3231 # check for __initcall(), use device_initcall() explicitly please
3232                 if ($line =~ /^.\s*__initcall\s*\(/) {
3233                         WARN("USE_DEVICE_INITCALL",
3234                              "please use device_initcall() instead of __initcall()\n" . $herecurr);
3235                 }
3236 # check for various ops structs, ensure they are const.
3237                 my $struct_ops = qr{acpi_dock_ops|
3238                                 address_space_operations|
3239                                 backlight_ops|
3240                                 block_device_operations|
3241                                 dentry_operations|
3242                                 dev_pm_ops|
3243                                 dma_map_ops|
3244                                 extent_io_ops|
3245                                 file_lock_operations|
3246                                 file_operations|
3247                                 hv_ops|
3248                                 ide_dma_ops|
3249                                 intel_dvo_dev_ops|
3250                                 item_operations|
3251                                 iwl_ops|
3252                                 kgdb_arch|
3253                                 kgdb_io|
3254                                 kset_uevent_ops|
3255                                 lock_manager_operations|
3256                                 microcode_ops|
3257                                 mtrr_ops|
3258                                 neigh_ops|
3259                                 nlmsvc_binding|
3260                                 pci_raw_ops|
3261                                 pipe_buf_operations|
3262                                 platform_hibernation_ops|
3263                                 platform_suspend_ops|
3264                                 proto_ops|
3265                                 rpc_pipe_ops|
3266                                 seq_operations|
3267                                 snd_ac97_build_ops|
3268                                 soc_pcmcia_socket_ops|
3269                                 stacktrace_ops|
3270                                 sysfs_ops|
3271                                 tty_operations|
3272                                 usb_mon_operations|
3273                                 wd_ops}x;
3274                 if ($line !~ /\bconst\b/ &&
3275                     $line =~ /\bstruct\s+($struct_ops)\b/) {
3276                         WARN("CONST_STRUCT",
3277                              "struct $1 should normally be const\n" .
3278                                 $herecurr);
3279                 }
3280
3281 # use of NR_CPUS is usually wrong
3282 # ignore definitions of NR_CPUS and usage to define arrays as likely right
3283                 if ($line =~ /\bNR_CPUS\b/ &&
3284                     $line !~ /^.\s*\s*#\s*if\b.*\bNR_CPUS\b/ &&
3285                     $line !~ /^.\s*\s*#\s*define\b.*\bNR_CPUS\b/ &&
3286                     $line !~ /^.\s*$Declare\s.*\[[^\]]*NR_CPUS[^\]]*\]/ &&
3287                     $line !~ /\[[^\]]*\.\.\.[^\]]*NR_CPUS[^\]]*\]/ &&
3288                     $line !~ /\[[^\]]*NR_CPUS[^\]]*\.\.\.[^\]]*\]/)
3289                 {
3290                         WARN("NR_CPUS",
3291                              "usage of NR_CPUS is often wrong - consider using cpu_possible(), num_possible_cpus(), for_each_possible_cpu(), etc\n" . $herecurr);
3292                 }
3293