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authorShiyong Li <shi-yong.li@motorola.com>2010-04-12 13:48:21 +0800
committerPekka Enberg <penberg@cs.helsinki.fi>2010-04-14 20:52:45 +0300
commit5c5e3b33b7cb959a401f823707bee006caadd76e (patch)
treeaa3c77659d80d714e833a35bcfc20b72a9b6f368 /mm/slab.c
parent0d0fb0f9c5fddef4a10242fe3337f00f528a3099 (diff)
slab: Fix missing DEBUG_SLAB last user
Even with SLAB_RED_ZONE and SLAB_STORE_USER enabled, kernel would NOT store redzone and last user data around allocated memory space if "arch cache line > sizeof(unsigned long long)". As a result, last user information is unexpectedly MISSED while dumping slab corruption log. This fix makes sure that redzone and last user tags get stored unless the required alignment breaks redzone's. Signed-off-by: Shiyong Li <shi-yong.li@motorola.com> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Diffstat (limited to 'mm/slab.c')
-rw-r--r--mm/slab.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/mm/slab.c b/mm/slab.c
index bac0f4fcc21..525c6646646 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2220,8 +2220,8 @@ kmem_cache_create (const char *name, size_t size, size_t align,
if (ralign < align) {
ralign = align;
}
- /* disable debug if necessary */
- if (ralign > __alignof__(unsigned long long))
+ /* disable debug if not aligning with REDZONE_ALIGN */
+ if (ralign & (__alignof__(unsigned long long) - 1))
flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER);
/*
* 4) Store it.
@@ -2247,8 +2247,8 @@ kmem_cache_create (const char *name, size_t size, size_t align,
*/
if (flags & SLAB_RED_ZONE) {
/* add space for red zone words */
- cachep->obj_offset += sizeof(unsigned long long);
- size += 2 * sizeof(unsigned long long);
+ cachep->obj_offset += align;
+ size += align + sizeof(unsigned long long);
}
if (flags & SLAB_STORE_USER) {
/* user store requires one word storage behind the end of