[MIPS] Signal cleanup
    
Move function prototypes to asm/signal.h to detect trivial errors and
add some __user tags to get rid of sparse warnings.  Generated code
should not be changed.
    
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/kernel/signal_n32.c b/arch/mips/kernel/signal_n32.c
index 3e168c0..220e6de 100644
--- a/arch/mips/kernel/signal_n32.c
+++ b/arch/mips/kernel/signal_n32.c
@@ -141,7 +141,7 @@
 	/* The ucontext contains a stack32_t, so we must convert!  */
 	if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp))
 		goto badframe;
-	st.ss_sp = (void *)(long) sp;
+	st.ss_sp = (void __user *)(long) sp;
 	if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size))
 		goto badframe;
 	if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags))