[PATCH] Fix zeroing on exception in copy_*_user

- Don't zero for __copy_from_user_inatomic following i386.
This will prevent spurious zeros for parallel file system writers when
one does a exception
- The string instruction version didn't zero the output on
exception. Oops.

Also I cleaned up the code a bit while I was at it and added a minor
optimization to the string instruction path.

Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 3 insertions, 3 deletions

diff --git a/include/asm-x86_64/uaccess.h b/include/asm-x86_64/uaccess.h
index 1e1fa00..bc68120 100644
--- a/include/asm-x86_64/uaccess.h
+++ b/include/asm-x86_64/uaccess.h
@@ -238,6 +238,7 @@ do {									\
 
 /* Handles exceptions in both to and from, but doesn't do access_ok */
 extern unsigned long copy_user_generic(void *to, const void *from, unsigned len); 
+extern unsigned long copy_user_generic_dontzero(void *to, const void *from, unsigned len);
 
 extern unsigned long copy_to_user(void __user *to, const void *from, unsigned len); 
 extern unsigned long copy_from_user(void *to, const void __user *from, unsigned len); 
@@ -303,7 +304,6 @@ static __always_inline int __copy_to_user(void __user *dst, const void *src, uns
 	}
 }	
 
-
 static __always_inline int __copy_in_user(void __user *dst, const void __user *src, unsigned size)
 { 
        int ret = 0;
@@ -352,7 +352,7 @@ long strlen_user(const char __user *str);
 unsigned long clear_user(void __user *mem, unsigned long len);
 unsigned long __clear_user(void __user *mem, unsigned long len);
 
-#define __copy_to_user_inatomic __copy_to_user
-#define __copy_from_user_inatomic __copy_from_user
+extern long __copy_from_user_inatomic(void *dst, const void __user *src, unsigned size);
+#define __copy_to_user_inatomic copy_user_generic
 
 #endif /* __X86_64_UACCESS_H */