From 392357e9d2b62cfa56045db98356e404df069ed8 Mon Sep 17 00:00:00 2001
From: Tomoki Shirasawa <sira@popeye.cc.u-tokyo.ac.jp>
Date: Wed, 13 Nov 2013 15:43:49 +0900
Subject: [PATCH] catch signal when before kernel init

---
 arch/x86/kernel/syscall.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/syscall.c b/arch/x86/kernel/syscall.c
index 9e8fc49b..f4582f25 100644
--- a/arch/x86/kernel/syscall.c
+++ b/arch/x86/kernel/syscall.c
@@ -85,15 +85,21 @@ SYSCALL_DECLARE(rt_sigreturn)
         return proc->sigrc;
 }
 
+extern struct x86_cpu_local_variables *locals;
+
 void
 check_signal(unsigned long rc, unsigned long *regs)
 {
-	struct process *proc = cpu_local_var(current);
+	struct process *proc;
 	struct k_sigaction *k;
-	int	sig = proc->signal;
+	int	sig;
 
+	if(locals == NULL)
+		return;
+	proc = cpu_local_var(current);
 	if(proc == NULL || proc->pid == 0)
 		return;
+	sig = proc->signal;
 
 	proc->signal = 0;
 	if(sig){