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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@amd.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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