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authorSatyam Sharma <satyam@infradead.org>2007-10-16 10:24:44 +0200
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 18:42:53 +0200
commit2408c55037c3f7d51a8a100025c47595e71b838c (patch)
tree71940f72dbadf6a6744ffbd062ef4fd8754aa623 /mm/slob.c
parentmove mm_struct and vm_area_struct (diff)
downloadlinux-2408c55037c3f7d51a8a100025c47595e71b838c.tar.xz
linux-2408c55037c3f7d51a8a100025c47595e71b838c.zip
{slub, slob}: use unlikely() for kfree(ZERO_OR_NULL_PTR) check
Considering kfree(NULL) would normally occur only in error paths and kfree(ZERO_SIZE_PTR) is uncommon as well, so let's use unlikely() for the condition check in SLUB's and SLOB's kfree() to optimize for the common case. SLAB has this already. Signed-off-by: Satyam Sharma <satyam@infradead.org> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Cc: 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/slob.c')
-rw-r--r--mm/slob.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/mm/slob.c b/mm/slob.c
index ec33fcdc852e..a886e83e17ef 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -360,7 +360,7 @@ static void slob_free(void *block, int size)
slobidx_t units;
unsigned long flags;
- if (ZERO_OR_NULL_PTR(block))
+ if (unlikely(ZERO_OR_NULL_PTR(block)))
return;
BUG_ON(!size);
@@ -466,7 +466,7 @@ void kfree(const void *block)
{
struct slob_page *sp;
- if (ZERO_OR_NULL_PTR(block))
+ if (unlikely(ZERO_OR_NULL_PTR(block)))
return;
sp = (struct slob_page *)virt_to_page(block);
@@ -484,7 +484,7 @@ size_t ksize(const void *block)
{
struct slob_page *sp;
- if (ZERO_OR_NULL_PTR(block))
+ if (unlikely(ZERO_OR_NULL_PTR(block)))
return 0;
sp = (struct slob_page *)virt_to_page(block);