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mm: faster kmalloc_array(), kcalloc()

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When both arguments to kmalloc_array() or kcalloc() are known at compile
time then their product is known at compile time but search for kmalloc
cache happens at runtime not at compile time.

Link: http://lkml.kernel.org/r/20160627213454.GA2440@p183.telecom.by
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan
2016-07-26 15:22:08 -07:00
committed by Linus Torvalds
parent 72baeef0c2
commit 91c6a05f72
1 changed files with 2 additions and 0 deletions
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2
include/linux/slab.h
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@@ -565,6 +565,8 @@ static inline void *kmalloc_array(size_t n, size_t size, gfp_t flags)
{ {
if (size != 0 && n > SIZE_MAX / size) if (size != 0 && n > SIZE_MAX / size)
return NULL; return NULL;
if (__builtin_constant_p(n) && __builtin_constant_p(size))
return kmalloc(n * size, flags);
return __kmalloc(n * size, flags); return __kmalloc(n * size, flags);
} }