1 files changed, 5 insertions, 3 deletions

diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index 14c7faf02909..6b76caa22981 100644
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -36,7 +36,7 @@ static struct notifier_block panic_block = {
 
 void touch_softlockup_watchdog(void)
 {
-        per_cpu(touch_timestamp, raw_smp_processor_id()) = jiffies;
+        __raw_get_cpu_var(touch_timestamp) = jiffies;
 }
 EXPORT_SYMBOL(touch_softlockup_watchdog);
 
@@ -104,7 +104,7 @@ static int watchdog(void * __bind_cpu)
 /*
  * Create/destroy watchdog threads as CPUs come and go:
  */
-static int
+static int __devinit
 cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
 {
         int hotcpu = (unsigned long)hcpu;
@@ -127,6 +127,8 @@ cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
                 break;
 #ifdef CONFIG_HOTPLUG_CPU
         case CPU_UP_CANCELED:
+                if (!per_cpu(watchdog_task, hotcpu))
+                        break;
                 /* Unbind so it can run.  Fall thru. */
                 kthread_bind(per_cpu(watchdog_task, hotcpu),
                              any_online_cpu(cpu_online_map));
@@ -140,7 +142,7 @@ cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
         return NOTIFY_OK;
 }
 
-static struct notifier_block cpu_nfb = {
+static struct notifier_block __devinitdata cpu_nfb = {
         .notifier_call = cpu_callback
 };