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alarmtimer: Convert posix timer functions to alarm_start_timer()

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Use the new alarm_start_timer() for arming and rearming posix interval
timers and for clock_nanosleep() so that already expired timers do not go
through the full timer interrupt cycle.

Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Acked-by: John Stultz <jstultz@google.com>
Link: https://patch.msgid.link/20260408114952.400451460@kernel.org
This commit is contained in:
Thomas Gleixner 2026-04-08 13:54:16 +02:00
parent 183d00b727
commit f4b58f61da
1 changed files with 13 additions and 7 deletions
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20
kernel/time/alarmtimer.c
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@ -560,8 +560,7 @@ static bool alarm_timer_rearm(struct k_itimer *timr)
struct alarm *alarm = &timr->it.alarm.alarmtimer;
timr->it_overrun += alarm_forward_now(alarm, timr->it_interval);
alarm_start(alarm, alarm->node.expires);
return true;
return alarm_start_timer(alarm, alarm->node.expires, false);
}
/**
@ -625,11 +624,16 @@ static bool alarm_timer_arm(struct k_itimer *timr, ktime_t expires,
if (!absolute)
expires = ktime_add_safe(expires, base->get_ktime());
if (sigev_none)
/*
* sigev_none needs to update the expires value and pretend
* that the timer is queued
*/
if (sigev_none) {
alarm->node.expires = expires;
else
alarm_start(&timr->it.alarm.alarmtimer, expires);
return true;
return true;
}
return alarm_start_timer(&timr->it.alarm.alarmtimer, expires, false);
}
/**
@ -736,7 +740,9 @@ static int alarmtimer_do_nsleep(struct alarm *alarm, ktime_t absexp,
alarm->data = (void *)current;
do {
set_current_state(TASK_INTERRUPTIBLE);
alarm_start(alarm, absexp);
if (!alarm_start_timer(alarm, absexp, false))
alarm->data = NULL;
if (likely(alarm->data))
schedule();