The patch titled
{slub, slob}: use unlikely() for kfree(ZERO_OR_NULL_PTR) check
has been added to the -mm tree. Its filename is
slub-slob-use-unlikely-for-kfreezero_or_null_ptr-check.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: {slub, slob}: use unlikely() for kfree(ZERO_OR_NULL_PTR) check
From: Satyam Sharma <satyam@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
Cc: Christoph Lameter <clameter@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/slob.c | 6 +++---
mm/slub.c | 8 ++++----
2 files changed, 7 insertions(+), 7 deletions(-)
diff -puN mm/slob.c~slub-slob-use-unlikely-for-kfreezero_or_null_ptr-check mm/slob.c
--- a/mm/slob.c~slub-slob-use-unlikely-for-kfreezero_or_null_ptr-check
+++ a/mm/slob.c
@@ -360,7 +360,7 @@ static void slob_free(void *block, int s
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);
diff -puN mm/slub.c~slub-slob-use-unlikely-for-kfreezero_or_null_ptr-check mm/slub.c
--- a/mm/slub.c~slub-slob-use-unlikely-for-kfreezero_or_null_ptr-check
+++ a/mm/slub.c
@@ -2434,7 +2434,7 @@ size_t ksize(const void *object)
struct page *page;
struct kmem_cache *s;
- if (ZERO_OR_NULL_PTR(object))
+ if (unlikely(ZERO_OR_NULL_PTR(object)))
return 0;
page = get_object_page(object);
@@ -2468,7 +2468,7 @@ void kfree(const void *x)
{
struct page *page;
- if (ZERO_OR_NULL_PTR(x))
+ if (unlikely(ZERO_OR_NULL_PTR(x)))
return;
page = virt_to_head_page(x);
@@ -2785,7 +2785,7 @@ void *__kmalloc_track_caller(size_t size
get_order(size));
s = get_slab(size, gfpflags);
- if (ZERO_OR_NULL_PTR(s))
+ if (unlikely(ZERO_OR_NULL_PTR(s)))
return s;
return slab_alloc(s, gfpflags, -1, caller);
@@ -2801,7 +2801,7 @@ void *__kmalloc_node_track_caller(size_t
get_order(size));
s = get_slab(size, gfpflags);
- if (ZERO_OR_NULL_PTR(s))
+ if (unlikely(ZERO_OR_NULL_PTR(s)))
return s;
return slab_alloc(s, gfpflags, node, caller);
_
Patches currently in -mm which might be from satyam@xxxxxxxxxxxxx are
ia64-include-kconfigpreempt.patch
git-netdev-all.patch
git-net.patch
introduce-u16_max-and-u32_max.patch
use-mutex-instead-of-semaphore-in-the-onstream-scsi-tape-driver.patch
slub-slob-use-unlikely-for-kfreezero_or_null_ptr-check.patch
argv_split-allow-argv_split-to-handle-null-pointer-in-argcp-parameter-gracefully.patch
-
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