]> git.openfabrics.org - ~shefty/rdma-dev.git/blobdiff - arch/mips/kernel/setup.c
MIPS: Merge overlapping bootmem ranges
[~shefty/rdma-dev.git] / arch / mips / kernel / setup.c
index a53f8ec37aac68beef41b905b88cf1fe92e805d9..290dc6a1d7a344413e36f00fdacfa86e9d1bcbe3 100644 (file)
@@ -79,7 +79,7 @@ static struct resource data_resource = { .name = "Kernel data", };
 void __init add_memory_region(phys_t start, phys_t size, long type)
 {
        int x = boot_mem_map.nr_map;
-       struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
+       int i;
 
        /* Sanity check */
        if (start + size < start) {
@@ -88,15 +88,29 @@ void __init add_memory_region(phys_t start, phys_t size, long type)
        }
 
        /*
-        * Try to merge with previous entry if any.  This is far less than
-        * perfect but is sufficient for most real world cases.
+        * Try to merge with existing entry, if any.
         */
-       if (x && prev->addr + prev->size == start && prev->type == type) {
-               prev->size += size;
+       for (i = 0; i < boot_mem_map.nr_map; i++) {
+               struct boot_mem_map_entry *entry = boot_mem_map.map + i;
+               unsigned long top;
+
+               if (entry->type != type)
+                       continue;
+
+               if (start + size < entry->addr)
+                       continue;                       /* no overlap */
+
+               if (entry->addr + entry->size < start)
+                       continue;                       /* no overlap */
+
+               top = max(entry->addr + entry->size, start + size);
+               entry->addr = min(entry->addr, start);
+               entry->size = top - entry->addr;
+
                return;
        }
 
-       if (x == BOOT_MEM_MAP_MAX) {
+       if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
                pr_err("Ooops! Too many entries in the memory map!\n");
                return;
        }