linux-kernel - [PATCH 1/5] x86: mce: Disable preemption when calling raise

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Message-Id: <1342720781-4729-2-git-send-email-gong.chen@linux.intel.com>
Date:	Thu, 19 Jul 2012 13:59:37 -0400
From:	Chen Gong <gong.chen@...ux.intel.com>
To:	tglx@...utronix.de
Cc:	tony.luck@...el.com, bp@...64.org, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/5] x86: mce: Disable preemption when calling raise_local()

From: Thomas Gleixner <tglx@...utronix.de>

raise_mce() has a code path which does not disable preemption when the
raise_local() is called. The per cpu variable access in raise_local()
depends on preemption being disabled to be functional. So that code
path was either never tested or never tested with CONFIG_DEBUG_PREEMPT
enabled.

Add the missing preempt_disable/enable() pair around the call.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/kernel/cpu/mcheck/mce-inject.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/kernel/cpu/mcheck/mce-inject.c b/arch/x86/kernel/cpu/mcheck/mce-inject.c
index fc4beb3..753746f 100644
--- a/arch/x86/kernel/cpu/mcheck/mce-inject.c
+++ b/arch/x86/kernel/cpu/mcheck/mce-inject.c
@@ -194,7 +194,11 @@ static void raise_mce(struct mce *m)
 		put_online_cpus();
 	} else
 #endif
+	{
+		preempt_disable();
 		raise_local();
+		preempt_enable();
+	}
 }
 
 /* Error injection interface */
-- 
1.7.10.4

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