[PATCH 01/31] x86: MCE: Synchronize core after machine check handling

[Andi Kleen]

From: Andi Kleen <ak@xxxxxxxxxxxxxxx>

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@xxxxxxxxxxxxxxx>
---
 arch/x86/kernel/cpu/mcheck/mce.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 87f8198..249e3cf 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -328,6 +328,8 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
 	 * Don't clear MCG_STATUS here because it's only defined for
 	 * exceptions.
 	 */
+
+	sync_core();
 }
 EXPORT_SYMBOL_GPL(machine_check_poll);
 
@@ -501,6 +503,7 @@ void do_machine_check(struct pt_regs *regs, long error_code)
 	mce_wrmsrl(MSR_IA32_MCG_STATUS, 0);
  out2:
 	atomic_dec(&mce_entry);
+	sync_core();
 }
 EXPORT_SYMBOL_GPL(do_machine_check);
 
-- 
1.6.0.2

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