The patch titled
kcalloc: remove runtime division
has been removed from the -mm tree. Its filename was
kcalloc-remove-runtime-division.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: kcalloc: remove runtime division
From: Milton Miller <miltonm@xxxxxxx>
While in all cases in the kernel we know the size of the elements to be
created, we don't always know the count of elements. By commuting the size
and count in the overflow check, the compiler can reduce the runtime division
of size_t with a compare to a (unique) constant in these cases.
Signed-off-by: Milton Miller <miltonm@xxxxxxx>
Cc: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/slab.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN include/linux/slab.h~kcalloc-remove-runtime-division include/linux/slab.h
--- a/include/linux/slab.h~kcalloc-remove-runtime-division
+++ a/include/linux/slab.h
@@ -180,7 +180,7 @@ size_t ksize(const void *);
*/
static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
{
- if (n != 0 && size > ULONG_MAX / n)
+ if (size != 0 && n > ULONG_MAX / size)
return NULL;
return __kmalloc(n * size, flags | __GFP_ZERO);
}
_
Patches currently in -mm which might be from miltonm@xxxxxxx are
origin.patch
linux-next.patch
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