[PATCH] x86: Add a cumulative thermal throttle event counter.

The counter is exported to /sys that keeps track of the
number of thermal events, such that the user knows how bad the
thermal problem might be (since the logging to syslog and mcelog
is rate limited).

AK: Fixed cpu hotplug locking

Signed-off-by: Dmitriy Zavin <dmitriyz@google.com>
Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/x86_64/kernel/mce_intel.c b/arch/x86_64/kernel/mce_intel.c
index dec11219e278..6551505d8a2c 100644
--- a/arch/x86_64/kernel/mce_intel.c
+++ b/arch/x86_64/kernel/mce_intel.c
@@ -77,6 +77,9 @@ static void __cpuinit intel_init_thermal(struct cpuinfo_x86 *c)
         apic_write(APIC_LVTTHMR, l & ~APIC_LVT_MASKED);
         printk(KERN_INFO "CPU%d: Thermal monitoring enabled (%s)\n",
                 cpu, tm2 ? "TM2" : "TM1");
+
+        /* enable thermal throttle processing */
+        atomic_set(&therm_throt_en, 1);
         return;
 }