[RFC: -mm patch] kcalloc(): INT_MAX -> ULONG_MAX

[Adrian Bunk]

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 <bunk@xxxxxxxxx>

---

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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