diff options
Diffstat (limited to 'kernel/watchdog.c')
| -rw-r--r-- | kernel/watchdog.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/kernel/watchdog.c b/kernel/watchdog.c index b81f777838d5..5470dce212c0 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -330,6 +330,9 @@ static void watchdog_interrupt_count(void) __this_cpu_inc(hrtimer_interrupts); } +static DEFINE_PER_CPU(struct completion, softlockup_completion); +static DEFINE_PER_CPU(struct cpu_stop_work, softlockup_stop_work); + /* * The watchdog thread function - touches the timestamp. * @@ -343,12 +346,11 @@ static int softlockup_fn(void *data) __this_cpu_write(soft_lockup_hrtimer_cnt, __this_cpu_read(hrtimer_interrupts)); __touch_watchdog(); + complete(this_cpu_ptr(&softlockup_completion)); return 0; } -static DEFINE_PER_CPU(struct cpu_stop_work, softlockup_stop_work); - /* watchdog kicker functions */ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer) { @@ -364,9 +366,12 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer) watchdog_interrupt_count(); /* kick the softlockup detector */ - stop_one_cpu_nowait(smp_processor_id(), - softlockup_fn, NULL, - this_cpu_ptr(&softlockup_stop_work)); + if (completion_done(this_cpu_ptr(&softlockup_completion))) { + reinit_completion(this_cpu_ptr(&softlockup_completion)); + stop_one_cpu_nowait(smp_processor_id(), + softlockup_fn, NULL, + this_cpu_ptr(&softlockup_stop_work)); + } /* .. and repeat */ hrtimer_forward_now(hrtimer, ns_to_ktime(sample_period)); @@ -467,9 +472,13 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer) static void watchdog_enable(unsigned int cpu) { struct hrtimer *hrtimer = this_cpu_ptr(&watchdog_hrtimer); + struct completion *done = this_cpu_ptr(&softlockup_completion); WARN_ON_ONCE(cpu != smp_processor_id()); + init_completion(done); + complete(done); + /* * Start the timer first to prevent the NMI watchdog triggering * before the timer has a chance to fire. @@ -499,6 +508,7 @@ static void watchdog_disable(unsigned int cpu) */ watchdog_nmi_disable(cpu); hrtimer_cancel(hrtimer); + wait_for_completion(this_cpu_ptr(&softlockup_completion)); } static int softlockup_stop_fn(void *data) |