From b789ad63ac46b00f0862bdc23fc95556adc3cf2f Mon Sep 17 00:00:00 2001
From: Yong Zhang <yong.zhang@windriver.com>
Date: Thu, 19 Jul 2012 09:13:53 +0200
Subject: [PATCH] MIPS: smp: Warn on too early irq enable

Just to catch a potential issue.

Signed-off-by: Yong Zhang <yong.zhang0@gmail.com>
Cc: Sergei Shtylyov <sshtylyov@mvista.com>
Cc: David Daney <david.daney@cavium.com>
Acked-by: David Daney <david.daney@cavium.com>
Patchwork: https://patchwork.linux-mips.org/patch/3852/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---
 arch/mips/kernel/smp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
index eb3e2b112a0d..1268392f1d27 100644
--- a/arch/mips/kernel/smp.c
+++ b/arch/mips/kernel/smp.c
@@ -130,6 +130,11 @@ asmlinkage __cpuinit void start_secondary(void)
 
 	synchronise_count_slave();
 
+	/*
+	 * irq will be enabled in ->smp_finish(), enabling it too early
+	 * is dangerous.
+	 */
+	WARN_ON_ONCE(!irqs_disabled());
 	mp_ops->smp_finish();
 
 	cpu_idle();
-- 
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