[PATCH 2/2] x86: re-enable MCE on secondary CPUS after suspend/resume

[Andreas Herrmann <andreas.herrmann3@amd.com>]

Impact: fix suspend/resume bug with MCE

After suspend/resume MCx_CTL registers of secondary CPUs are cleared.
(At least that's what I've observed on several systems.)
Linux currently only re-initializes MCE on the boot CPU - see mce_resume().
Thus after suspend/resume we end up with a system where MCE is active
on the boot CPU but switched off on all other CPUs.

By calling mce_init() whenever a CPU comes online this problem is
solved.

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

diff --git a/arch/x86/kernel/cpu/mcheck/mce_64.c b/arch/x86/kernel/cpu/mcheck/mce_64.c
index e2d9649..0174539 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_64.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_64.c
@@ -889,6 +889,7 @@ static int __cpuinit mce_cpu_callback(struct notifier_block *nfb,
 		mce_create_device(cpu);
 		if (threshold_cpu_callback)
 			threshold_cpu_callback(action, cpu);
+		mce_init(NULL);
 		break;
 	case CPU_DEAD:
 	case CPU_DEAD_FROZEN:
-- 
1.6.0.4