diff --git a/arch/powerpc/kernel/signal.h b/arch/powerpc/kernel/signal.h
index 28f4b9f..b427bf8 100644
--- a/arch/powerpc/kernel/signal.h
+++ b/arch/powerpc/kernel/signal.h
@@ -12,6 +12,8 @@
 
 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
 
+extern void do_signal(struct pt_regs *regs, unsigned long thread_info_flags);
+
 extern void __user * get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
 				  size_t frame_size);
 extern void restore_sigmask(sigset_t *set);