From: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Date: Fri, 2 Aug 2013 02:02:42 +0000 (+0900)
Subject: mm, slab_common: add 'unlikely' to size check of kmalloc_slab()
X-Git-Tag: v3.12-rc1~8^2~3
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9de1bc875261411bf0a900e90cfe0c7a31c4917b;p=kernel%2Fkernel-generic.git

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>
---

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;
 	}