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tick: Remove now unneeded low-res tick stop on CPUHP_AP_TICK_DYING

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The generic clockevent layer now detaches and stops the underlying
clockevent from the dying CPU, unifying the tick behaviour for both
periodic and oneshot mode on offline CPUs. There is no more need for
the tick layer to care about that.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20241029125451.54574-4-frederic@kernel.org
This commit is contained in:
Frederic Weisbecker 2024-10-29 13:54:44 +01:00 committed by Thomas Gleixner
parent 3b1596a21f
commit a6347864d9
1 changed files with 6 additions and 19 deletions
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25
kernel/time/tick-sched.c
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@ -311,14 +311,6 @@ static enum hrtimer_restart tick_nohz_handler(struct hrtimer *timer)
return HRTIMER_RESTART;
}
static void tick_sched_timer_cancel(struct tick_sched *ts)
{
if (tick_sched_flag_test(ts, TS_FLAG_HIGHRES))
hrtimer_cancel(&ts->sched_timer);
else if (tick_sched_flag_test(ts, TS_FLAG_NOHZ))
tick_program_event(KTIME_MAX, 1);
}
#ifdef CONFIG_NO_HZ_FULL
cpumask_var_t tick_nohz_full_mask;
EXPORT_SYMBOL_GPL(tick_nohz_full_mask);
@ -1055,7 +1047,10 @@ static void tick_nohz_stop_tick(struct tick_sched *ts, int cpu)
* the tick timer.
*/
if (unlikely(expires == KTIME_MAX)) {
tick_sched_timer_cancel(ts);
if (tick_sched_flag_test(ts, TS_FLAG_HIGHRES))
hrtimer_cancel(&ts->sched_timer);
else
tick_program_event(KTIME_MAX, 1);
return;
}
@ -1604,21 +1599,13 @@ void tick_setup_sched_timer(bool hrtimer)
*/
void tick_sched_timer_dying(int cpu)
{
struct tick_device *td = &per_cpu(tick_cpu_device, cpu);
struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
struct clock_event_device *dev = td->evtdev;
ktime_t idle_sleeptime, iowait_sleeptime;
unsigned long idle_calls, idle_sleeps;
/* This must happen before hrtimers are migrated! */
tick_sched_timer_cancel(ts);
/*
* If the clockevents doesn't support CLOCK_EVT_STATE_ONESHOT_STOPPED,
* make sure not to call low-res tick handler.
*/
if (tick_sched_flag_test(ts, TS_FLAG_NOHZ))
dev->event_handler = clockevents_handle_noop;
if (tick_sched_flag_test(ts, TS_FLAG_HIGHRES))
hrtimer_cancel(&ts->sched_timer);
idle_sleeptime = ts->idle_sleeptime;
iowait_sleeptime = ts->iowait_sleeptime;