| From | Anna-Maria Behnsen <> | Subject | [PATCH v4 12/16] timer: Check if timers base is handled already | Date | Fri, 4 Nov 2022 15:57:33 +0100 |
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Due to the conversion of the NOHZ timer placement to a pull at expiry time model, the per CPU timer bases with non pinned timers are no longer handled only by the local CPU. In case a remote CPU already expires the non pinned timers base of the local cpu, nothing more needs to be done by the local CPU. A check at the begin of the expire timers routine is required, because timer base lock is dropped before executing the timer callback function.
This is a preparatory work, but has no functional impact right now.
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de> --- kernel/time/timer.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/kernel/time/timer.c b/kernel/time/timer.c index 641e7284f0d7..f8b2065df79b 100644 --- a/kernel/time/timer.c +++ b/kernel/time/timer.c @@ -1912,6 +1912,9 @@ static inline void __run_timers(struct timer_base *base) lockdep_assert_held(&base->lock); + if (!!base->running_timer) + return; + while (time_after_eq(jiffies, base->clk) && time_after_eq(jiffies, base->next_expiry)) { levels = collect_expired_timers(base, heads); -- 2.30.2
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