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mm, slab_common: add 'unlikely' to size check of kmalloc_slab() 

Size is usually below than KMALLOC_MAX_SIZE.
If we add a 'unlikely' macro, compiler can make better code.

Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Joonsoo Kim 2013-08-02 11:02:42 +09:00 committed by Pekka Enberg
parent 68f06650ea
commit 9de1bc8752
1 changed files with 1 additions and 1 deletions
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mm/slab_common.c
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@ -373,7 +373,7 @@ struct kmem_cache *kmalloc_slab(size_t size, gfp_t flags)
{ {
int index; int index;
if (size > KMALLOC_MAX_SIZE) { if (unlikely(size > KMALLOC_MAX_SIZE)) {
WARN_ON_ONCE(!(flags & __GFP_NOWARN)); WARN_ON_ONCE(!(flags & __GFP_NOWARN));
return NULL; return NULL;
} }