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-rw-r--r--include/linux/sched.h8
-rw-r--r--kernel/power/suspend.c3
-rw-r--r--kernel/watchdog.c21
3 files changed, 30 insertions, 2 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 1e26a5e45aa..68dcffaa62a 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -334,6 +334,14 @@ static inline void lockup_detector_init(void)
}
#endif
+#if defined(CONFIG_LOCKUP_DETECTOR) && defined(CONFIG_SUSPEND)
+void lockup_detector_bootcpu_resume(void);
+#else
+static inline void lockup_detector_bootcpu_resume(void)
+{
+}
+#endif
+
#ifdef CONFIG_DETECT_HUNG_TASK
extern unsigned int sysctl_hung_task_panic;
extern unsigned long sysctl_hung_task_check_count;
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index c8b7446b27d..1da39ea248f 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -178,6 +178,9 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
arch_suspend_enable_irqs();
BUG_ON(irqs_disabled());
+ /* Kick the lockup detector */
+ lockup_detector_bootcpu_resume();
+
Enable_cpus:
enable_nonboot_cpus();
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 4b1dfba70f7..69add8a9da6 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -575,7 +575,7 @@ out:
/*
* Create/destroy watchdog threads as CPUs come and go:
*/
-static int __cpuinit
+static int
cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
{
int hotcpu = (unsigned long)hcpu;
@@ -610,10 +610,27 @@ cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
return NOTIFY_OK;
}
-static struct notifier_block __cpuinitdata cpu_nfb = {
+static struct notifier_block cpu_nfb = {
.notifier_call = cpu_callback
};
+#ifdef CONFIG_SUSPEND
+/*
+ * On exit from suspend we force an offline->online transition on the boot CPU
+ * so that the PMU state that was lost while in suspended state gets set up
+ * properly for the boot CPU. This information is required for restarting the
+ * NMI watchdog.
+ */
+void lockup_detector_bootcpu_resume(void)
+{
+ void *cpu = (void *)(long)smp_processor_id();
+
+ cpu_callback(&cpu_nfb, CPU_DEAD_FROZEN, cpu);
+ cpu_callback(&cpu_nfb, CPU_UP_PREPARE_FROZEN, cpu);
+ cpu_callback(&cpu_nfb, CPU_ONLINE_FROZEN, cpu);
+}
+#endif
+
void __init lockup_detector_init(void)
{
void *cpu = (void *)(long)smp_processor_id();