linux-kernel - [PATCH] [2/28] x86: MCE: Synchronize core after machine check handling

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Message-Id: <20090407150742.038CE1D046E@basil.firstfloor.org>
Date:	Tue,  7 Apr 2009 17:07:41 +0200 (CEST)
From:	Andi Kleen <andi@...stfloor.org>
To:	hpa@...or.com, linux-kernel@...r.kernel.org, mingo@...e.hu,
	tglx@...utronix.de
Subject: [PATCH] [2/28] x86: MCE: Synchronize core after machine check handling


Impact: Spec compliance

The example code in the IA32 SDM recommends to synchronize the CPU
after machine check handling. So do that here.

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

---
 arch/x86/kernel/cpu/mcheck/mce_64.c |    3 +++
 1 file changed, 3 insertions(+)

Index: linux/arch/x86/kernel/cpu/mcheck/mce_64.c
===================================================================
--- linux.orig/arch/x86/kernel/cpu/mcheck/mce_64.c	2009-04-07 16:09:59.000000000 +0200
+++ linux/arch/x86/kernel/cpu/mcheck/mce_64.c	2009-04-07 16:43:15.000000000 +0200
@@ -254,6 +254,8 @@
 	 * Don't clear MCG_STATUS here because it's only defined for
 	 * exceptions.
 	 */
+
+	sync_core();
 }
 
 /*
@@ -419,6 +421,7 @@
 	wrmsrl(MSR_IA32_MCG_STATUS, 0);
  out2:
 	atomic_dec(&mce_entry);
+	sync_core();
 }
 
 #ifdef CONFIG_X86_MCE_INTEL
--
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