Fix warning in prefetch_range

Fix this warning:
include/linux/prefetch.h: In function `prefetch_range':
include/linux/prefetch.h:62: warning: pointer of type `void *' used in arithmetic

--
Brian Gerst

diff -urN linux-2.6.5-rc1-bk/include/linux/prefetch.h linux/include/linux/prefetch.h
@@ -59,7 +59,7 @@
 {
 #ifdef ARCH_HAS_PREFETCH
 	char *cp;
-	char *end = addr + len;
+	char *end = (char *)addr + len;
 
 	for (cp = addr; cp < end; cp += PREFETCH_STRIDE)
 		prefetch(cp);

eh? That's a gcc extension which has worked silently since forever.

What compiler version is generating the warning?

gcc (GCC) 3.3.3 20040412 (Red Hat Linux 3.3.3-7)

I saw the warning when compiling the nvidia driver, which uses -Wpointer-arith. I'll drop that switch instead.

--
Brian Gerst