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authorChristoph Lameter <clameter@sgi.com>2007-05-23 13:57:56 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-23 20:14:13 -0700
commit33e9e24101abac2bf3535d0d013d6d27d19197cb (patch)
tree04d4e3952331b66fef36efa0dc0612cd4f6385c9 /mm/slub.c
parent418508c13222ddba475873ea95c8aeadd26104f2 (diff)
downloadop-kernel-dev-33e9e24101abac2bf3535d0d013d6d27d19197cb.zip
op-kernel-dev-33e9e24101abac2bf3535d0d013d6d27d19197cb.tar.gz
SLUB Debug: fix check for super sized slabs (>512k 64bit, >256k 32bit)
The check for super sized slabs where we can no longer move the free pointer behind the object for debugging purposes etc is accessing a field that is not setup yet. We must use objsize here since the size of the slab has not been determined yet. The effect of this is that a global slab shrink via "slabinfo -s" will show errors about offsets being wrong if booted with slub_debug. Potentially there are other troubles with huge slabs under slub_debug because the calculated free pointer offset is truncated. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/slub.c')
-rw-r--r--mm/slub.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/slub.c b/mm/slub.c
index 0b0c2a3..3e5aefc 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -939,7 +939,7 @@ static void kmem_cache_open_debug_check(struct kmem_cache *s)
* Debugging or ctor may create a need to move the free
* pointer. Fail if this happens.
*/
- if (s->size >= 65535 * sizeof(void *)) {
+ if (s->objsize >= 65535 * sizeof(void *)) {
BUG_ON(s->flags & (SLAB_RED_ZONE | SLAB_POISON |
SLAB_STORE_USER | SLAB_DESTROY_BY_RCU));
BUG_ON(s->ctor);
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