Since size_t has the same size as a long on all architectures, it's
enough for overflow checks to check against ULONG_MAX.
This change could allow a compiler better optimization (especially in
the n=1 case).
The practical effect seems to be positive, but quite small:
text data bss dec hex filename
21762380 5859870 1848928 29471178 1c1b1ca vmlinux-old
21762211 5859870 1848928 29471009 1c1b121 vmlinux-patched
Signed-off-by: Adrian Bunk <[email protected]>
---
This patch was already sent on:
- 20 Aug 2005
--- linux-2.6.13-rc6-mm1-full/include/linux/slab.h.old 2005-08-20 04:10:09.000000000 +0200
+++ linux-2.6.13-rc6-mm1-full/include/linux/slab.h 2005-08-20 04:11:04.000000000 +0200
@@ -113,7 +113,7 @@
*/
static inline void *kcalloc(size_t n, size_t size, unsigned int __nocast flags)
{
- if (n != 0 && size > INT_MAX / n)
+ if (n != 0 && size > ULONG_MAX / n)
return NULL;
return kzalloc(n * size, flags);
}
-
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