x86, mce: add MCE poll count to /proc/interrupts

Keep a count of the machine check polls (or CMCI events) in
/proc/interrupts.

Andi needs this for debugging, but it's also useful in general
to see what's going in by the kernel.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 287268d2183..784f6ae9d6f 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -264,6 +264,8 @@ static inline void mce_get_rip(struct mce *m, struct pt_regs *regs)
         }
 }
 
+DEFINE_PER_CPU(unsigned, mce_poll_count);
+
 /*
  * Poll for corrected events or events that happened before reset.
  * Those are just logged through /dev/mcelog.
@@ -275,6 +277,8 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
         struct mce m;
         int i;
 
+        __get_cpu_var(mce_poll_count)++;
+
         mce_setup(&m);
 
         m.mcgstatus = mce_rdmsrl(MSR_IA32_MCG_STATUS);