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[PATCH] x86_64: Minor string functions optimizations

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- Use tail call from clear_user to __clear_user to save some code size
 - Use standard memcpy for forward memmove

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen 2006-06-26 13:59:47 +02:00 • committed by Linus Torvalds
parent 2ee60e1789
commit 6bfa9bb519
2 changed files with 2 additions and 2 deletions
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2
arch/x86_64/lib/memmove.c
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@ -9,7 +9,7 @@
void *memmove(void * dest,const void *src,size_t count) void *memmove(void * dest,const void *src,size_t count)
{ {
if (dest < src) { if (dest < src) {
__inline_memcpy(dest,src,count); return memcpy(dest,src,count);
} else { } else {
char *p = (char *) dest + count; char *p = (char *) dest + count;
char *s = (char *) src + count; char *s = (char *) src + count;

2
arch/x86_64/lib/usercopy.c
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@ -55,7 +55,7 @@ strncpy_from_user(char *dst, const char __user *src, long count)
{ {
long res = -EFAULT; long res = -EFAULT;
if (access_ok(VERIFY_READ, src, 1)) if (access_ok(VERIFY_READ, src, 1))
__do_strncpy_from_user(dst, src, count, res); return __strncpy_from_user(dst, src, count);
return res; return res;
} }
EXPORT_SYMBOL(strncpy_from_user); EXPORT_SYMBOL(strncpy_from_user);