linux-kernel - [PATCH v4 2/2] x86 mce: use new printk recursion disabling interface

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Message-ID: <4FCC265F.5@intel.com>
Date:	Mon, 04 Jun 2012 11:07:11 +0800
From:	ShuoX Liu <shuox.liu@...el.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	Borislav Petkov <bp@...en8.de>,
	Yanmin Zhang <yanmin_zhang@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>, andi@...stfloor.org,
	Tony Luck <tony.luck@...el.com>, Ingo Molnar <mingo@...e.hu>
Subject: [PATCH v4 2/2] x86 mce: use new printk recursion disabling interface

From: ShuoX Liu <shuox.liu@...el.com>

Disable printk recursion to make sure MCE logs printed out.

Signed-off-by: Yanmin Zhang <yanmin_zhang@...ux.intel.com>
Signed-off-by: ShuoX Liu <shuox.liu@...el.com>
---
We hit it when running a MTBF testing on a Android atom mobile.
---
 arch/x86/kernel/cpu/mcheck/mce.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 2afcbd2..906e838 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -306,6 +306,7 @@ static void mce_panic(char *msg, struct mce *final, char *exp)
 {
 	int i, apei_err = 0;
 
+	printk_recursion_check_disable();
 	if (!fake_panic) {
 		/*
 		 * Make sure only one CPU runs in machine check panic
@@ -360,6 +361,7 @@ static void mce_panic(char *msg, struct mce *final, char *exp)
 		panic(msg);
 	} else
 		pr_emerg(HW_ERR "Fake kernel panic: %s\n", msg);
+	printk_recursion_check_enable();
 }
 
 /* Support code for software error injection */
-- 
1.7.1

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