mm: faster kmalloc_array(), kcalloc()
PATCH 1/1 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.
Signed-off-by Alexey Dobriyan <[email protected]>
---
include/linux/slab.h | 2 ++ 1 file changed, 2 insertions(+)
include/linux/slab.h +2 -0
@@ -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); }