From: Alexey Dobriyan <adobriyan@gmail.com>
To: akpm@linux-foundation.org
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH] mm: faster kmalloc_array(), kcalloc()
Date: Tue, 28 Jun 2016 00:34:55 +0300 [thread overview]
Message-ID: <20160627213454.GA2440@p183.telecom.by> (raw)
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);
}
reply other threads:[~2016-06-27 21:35 UTC|newest]
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