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authorAlexey Dobriyan <adobriyan@gmail.com>2016-07-26 15:22:08 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-07-26 16:19:19 -0700
commit91c6a05f72a996bee5133e76374ab3ad7d3b9b72 (patch)
treec1538c32df9bf170c43dd4044f833ad957d0968f /include/linux/slab.h
parent72baeef0c2710a9ac99670e59d4865b24ffd2d18 (diff)
mm: faster kmalloc_array(), kcalloc()
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>
Diffstat (limited to 'include/linux/slab.h')
-rw-r--r--include/linux/slab.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/slab.h b/include/linux/slab.h
index aeb3e6d00a66..1a4ea551aae5 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -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)
return NULL;
+ if (__builtin_constant_p(n) && __builtin_constant_p(size))
+ return kmalloc(n * size, flags);
return __kmalloc(n * size, flags);
}