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

[Joonsoo Kim]

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

Signed-off-by: Joonsoo Kim <iamjoonsoo....@lge.com>

diff --git a/mm/slab_common.c b/mm/slab_common.c
index 538bade..f0410eb 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -373,7 +373,7 @@ struct kmem_cache *kmalloc_slab(size_t size, gfp_t flags)
 {
        int index;
 
-       if (size > KMALLOC_MAX_SIZE) {
+       if (unlikely(size > KMALLOC_MAX_SIZE)) {
                WARN_ON_ONCE(!(flags & __GFP_NOWARN));
                return NULL;
        }
-- 
1.7.9.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/