linux-kernel - [PATCH] [3/4] MCE: Reinitialize per cpu features and ancient mces on resume

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Message-Id: <20080805171737.82C561B90085@one.firstfloor.org>
Date:	Tue,  5 Aug 2008 19:17:37 +0200 (CEST)
From:	Andi Kleen <andi@...stfloor.org>
To:	x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [3/4] MCE: Reinitialize per cpu features and ancient mces on resume


This fixes a long standing bug in the machine check code. On resume the
boot CPU wouldn't get its vendor specific state like thermal handling
reinitialized. This means the boot cpu wouldn't ever get any thermal
events reported again. Also the newly added ancient CPUs have the same problem.

Call the respective initialization functions on resume.


Signed-off-by: Andi Kleen <ak@...ux.intel.com>

Index: linux/arch/x86/kernel/cpu/mcheck/mce_64.c
===================================================================
--- linux.orig/arch/x86/kernel/cpu/mcheck/mce_64.c
+++ linux/arch/x86/kernel/cpu/mcheck/mce_64.c
@@ -753,6 +753,8 @@ __setup("mce=", mcheck_enable);
 static int mce_resume(struct sys_device *dev)
 {
 	mce_init(NULL);
+	mce_ancient_init(&current_cpu_data);
+	mce_cpu_features(&current_cpu_data);
 	return 0;
 }
 
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