[PATCH] x86_64: Fix sparse warnings

Fix sparse warnings

    warning: cast removes address space of expression

	for uses of put_user() on x86_64 caused by doing __m(addr) in
	__put_user_asm() with addr a __user pointer.
Signed-off-by: Roland Dreier <roland@topspin.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/asm-x86_64/uaccess.h

@@ -172,7 +172,7 @@ do {									\
 
 /* FIXME: this hack is definitely wrong -AK */
 struct __large_struct { unsigned long buf[100]; };
-#define __m(x) (*(struct __large_struct *)(x))
+#define __m(x) (*(struct __large_struct __user *)(x))
 
 /*
  * Tell gcc we read from memory instead of writing: this is because