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timers: Make sure TIMER_PINNED flag is set in add_timer_on()

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When adding a timer to the timer wheel using add_timer_on(), it is an
implicitly pinned timer. With the timer pull at expiry time model in place,
the TIMER_PINNED flag is required to make sure timers end up in proper
base.

Set the TIMER_PINNED flag unconditionally when add_timer_on() is executed.

Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lore.kernel.org/r/20240221090548.36600-8-anna-maria@linutronix.de
This commit is contained in:
Anna-Maria Behnsen 2024-02-21 10:05:35 +01:00 committed by Thomas Gleixner
parent c0e8c5b599
commit aae55e9fb8
1 changed files with 7 additions and 1 deletions
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8
kernel/time/timer.c
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@ -1329,7 +1329,10 @@ EXPORT_SYMBOL(add_timer_global);
* @timer: The timer to be started
* @cpu: The CPU to start it on
*
* Same as add_timer() except that it starts the timer on the given CPU.
* Same as add_timer() except that it starts the timer on the given CPU and
* the TIMER_PINNED flag is set. When timer shouldn't be a pinned timer in
* the next round, add_timer_global() should be used instead as it unsets
* the TIMER_PINNED flag.
*
* See add_timer() for further details.
*/
@ -1343,6 +1346,9 @@ void add_timer_on(struct timer_list *timer, int cpu)
if (WARN_ON_ONCE(timer_pending(timer)))
return;
/* Make sure timer flags have TIMER_PINNED flag set */
timer->flags |= TIMER_PINNED;
new_base = get_timer_cpu_base(timer->flags, cpu);
/*