powerpc/book3s: Increment the mce counter during machine_check_early call.

From: Mahesh Salgaonkar <[email protected]>

We don't see MCE counter getting increased in /proc/interrupts which gives false impression of no MCE occurred even when there were MCE events. The machine check early handling was added for PowerKVM and we missed to increment the MCE count in the early handler.

We also increment mce counters in the machine_check_exception call, but in most cases where we handle the error hypervisor never reaches there unless its fatal and we want to crash. Only during fatal situation we may see double increment of mce count. We need to fix that. But for now it always good to have some count increased instead of zero.

---
 arch/powerpc/kernel/traps.c |    2 ++
 1 file changed, 2 insertions(+)

index 1bd7ca2..239f1cd 100644
@@ -295,6 +295,8 @@ long machine_check_early(struct pt_regs *regs)
 {
 	long handled = 0;
 
+	__get_cpu_var(irq_stat).mce_exceptions++;
+
 	if (cur_cpu_spec && cur_cpu_spec->machine_check_early)
 		handled = cur_cpu_spec->machine_check_early(regs);
 	return handled;