Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

Pull core kernel fixes from Ingo Molnar:
 "Two small fixes"

* 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  Documentation: Reflect the new location of the NMI watchdog info
  nohz: Fix idle ticks in cpu summary line of /proc/stat

diff --git a/Documentation/00-INDEX b/Documentation/00-INDEX
index f54273e2ac979a386e27c0174e4a9524e60eae5e..ceb1ff735469995b560f0cdf07227407be682235 100644 (file)
--- a/Documentation/00-INDEX
+++ b/Documentation/00-INDEX
@@ -210,6 +210,8 @@ local_ops.txt
        - semantics and behavior of local atomic operations.
 lockdep-design.txt
        - documentation on the runtime locking correctness validator.
+lockup-watchdogs.txt
+       - info on soft and hard lockup detectors (aka nmi_watchdog).
 logo.gif
        - full colour GIF image of Linux logo (penguin - Tux).
 logo.txt
@@ -240,8 +242,6 @@ netlabel/
        - directory with information on the NetLabel subsystem.
 networking/
        - directory with info on various aspects of networking with Linux.
-nmi_watchdog.txt
-       - info on NMI watchdog for SMP systems.
 nommu-mmap.txt
        - documentation about no-mmu memory mapping support.
 numastat.txt

diff --git a/fs/proc/stat.c b/fs/proc/stat.c
index 64c3b3172367abbd1c1464b9372f33ee4efa7acb..e296572c73ed651dd7d81cc33eb3dd1b64de5d0d 100644 (file)
--- a/fs/proc/stat.c
+++ b/fs/proc/stat.c
@@ -45,10 +45,13 @@ static cputime64_t get_iowait_time(int cpu)
 
 static u64 get_idle_time(int cpu)
 {
-       u64 idle, idle_time = get_cpu_idle_time_us(cpu, NULL);
+       u64 idle, idle_time = -1ULL;
+
+       if (cpu_online(cpu))
+               idle_time = get_cpu_idle_time_us(cpu, NULL);
 
        if (idle_time == -1ULL)
-               /* !NO_HZ so we can rely on cpustat.idle */
+               /* !NO_HZ or cpu offline so we can rely on cpustat.idle */
                idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
        else
                idle = usecs_to_cputime64(idle_time);
@@ -58,10 +61,13 @@ static u64 get_idle_time(int cpu)
 
 static u64 get_iowait_time(int cpu)
 {
-       u64 iowait, iowait_time = get_cpu_iowait_time_us(cpu, NULL);
+       u64 iowait, iowait_time = -1ULL;
+
+       if (cpu_online(cpu))
+               iowait_time = get_cpu_iowait_time_us(cpu, NULL);
 
        if (iowait_time == -1ULL)
-               /* !NO_HZ so we can rely on cpustat.iowait */
+               /* !NO_HZ or cpu offline so we can rely on cpustat.iowait */
                iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
        else
                iowait = usecs_to_cputime64(iowait_time);