linux-kernel - [PATCH 1/2] x86: don't enable MCE after suspend/resume when system was booted with "nomce"

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Date:	Fri, 12 Dec 2008 19:08:27 +0100
From:	Andreas Herrmann <andreas.herrmann3@....com>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
CC:	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] x86: don't enable MCE after suspend/resume when system
	was booted with "nomce"

Impact: fix suspend/resume bug with MCE

A suspend/resume cycle unconditionally enables MCE
for the boot CPU if MCE is compiled into the kernel.
I.e. even a system booted with "nomce" configures MCE for the boot CPU.

This patch ensures that MCE is not turned on for systems booted with
"nomce".

Signed-off-by: Andreas Herrmann <andreas.herrmann3@....com>
---
 arch/x86/kernel/cpu/mcheck/mce_64.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce_64.c b/arch/x86/kernel/cpu/mcheck/mce_64.c
index 4b031a4..e2d9649 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_64.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_64.c
@@ -443,6 +443,9 @@ static void mce_init(void *dummy)
 	u64 cap;
 	int i;
 
+	if (mce_dont_init)
+		return;
+
 	rdmsrl(MSR_IA32_MCG_CAP, cap);
 	banks = cap & 0xff;
 	if (banks > MCE_EXTENDED_BANK) {
-- 
1.6.0.4



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