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| author | Alexey Dobriyan <adobriyan@gmail.com> | 2016-07-26 15:22:08 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-07-26 16:19:19 -0700 |
| commit | 91c6a05f72a996bee5133e76374ab3ad7d3b9b72 (patch) | |
| tree | c1538c32df9bf170c43dd4044f833ad957d0968f /include | |
| parent | 72baeef0c2710a9ac99670e59d4865b24ffd2d18 (diff) | |
| download | linux-91c6a05f72a996bee5133e76374ab3ad7d3b9b72.tar.gz linux-91c6a05f72a996bee5133e76374ab3ad7d3b9b72.tar.bz2 linux-91c6a05f72a996bee5133e76374ab3ad7d3b9b72.zip | |
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')
| -rw-r--r-- | include/linux/slab.h | 2 |
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); } |