Messages in this thread Patch in this message | | | Date | Tue, 28 Jun 2016 00:34:55 +0300 | From | Alexey Dobriyan <> | Subject | [PATCH] 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.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> ---
include/linux/slab.h | 2 ++ 1 file changed, 2 insertions(+)
--- 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); }
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