static void watchdog_disable(unsigned int cpu)
{
struct hrtimer *hrtimer = &__raw_get_cpu_var(watchdog_hrtimer);
watchdog_set_prio(SCHED_NORMAL, 0);
hrtimer_cancel(hrtimer);
/* disable the perf event */
watchdog_nmi_disable(cpu);
}
static void watchdog_disable(unsigned int cpu)
{
struct hrtimer *hrtimer = this_cpu_ptr(&watchdog_hrtimer);
watchdog_set_prio(SCHED_NORMAL, 0);
/*
* Disable the perf event first. That prevents that a large delay
* between disabling the timer and disabling the perf event causes
* the perf NMI to detect a false positive.
*/
watchdog_nmi_disable(cpu);
hrtimer_cancel(hrtimer);
}
static void update_timers(int cpu)
{
/*
* Make sure that perf event counter will adopt to a new
* sampling period. Updating the sampling period directly would
* be much nicer but we do not have an API for that now so
* let's use a big hammer.
* Hrtimer will adopt the new period on the next tick but this
* might be late already so we have to restart the timer as well.
*/
watchdog_nmi_disable(cpu);
smp_call_function_single(cpu, restart_watchdog_hrtimer, NULL, 1);
watchdog_nmi_enable(cpu);
}
