[PATCH] amd64 rt_sigframe user annotation

->pretcode in struct rt_sigframe is a userland pointer (and already
treated as such by code using that field). 

Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/x86_64/kernel/signal.c b/arch/x86_64/kernel/signal.c
index 7760224..d439ced 100644
--- a/arch/x86_64/kernel/signal.c
+++ b/arch/x86_64/kernel/signal.c
@@ -83,7 +83,7 @@
 
 struct rt_sigframe
 {
-	char *pretcode;
+	char __user *pretcode;
 	struct ucontext uc;
 	struct siginfo info;
 };