diff options
| author | Anna-Maria Behnsen <anna-maria@linutronix.de> | 2022-04-05 22:17:32 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-20 10:34:21 +0300 |
| commit | 111becd63e37139fb5c3f45bf887607e2df70c2c (patch) | |
| tree | 92be70ec154e45ab1ab9bb9c8c3da64982ae2375 /kernel/time | |
| parent | cbdd7a33c533e03404d51071af1e056ce3716caf (diff) | |
| download | linux-111becd63e37139fb5c3f45bf887607e2df70c2c.tar.xz | |
timers: Fix warning condition in __run_timers()
commit c54bc0fc84214b203f7a0ebfd1bd308ce2abe920 upstream.
When the timer base is empty, base::next_expiry is set to base::clk +
NEXT_TIMER_MAX_DELTA and base::next_expiry_recalc is false. When no timer
is queued until jiffies reaches base::next_expiry value, the warning for
not finding any expired timer and base::next_expiry_recalc is false in
__run_timers() triggers.
To prevent triggering the warning in this valid scenario
base::timers_pending needs to be added to the warning condition.
Fixes: 31cd0e119d50 ("timers: Recalculate next timer interrupt only when necessary")
Reported-by: Johannes Berg <johannes@sipsolutions.net>
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/20220405191732.7438-3-anna-maria@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/timer.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/kernel/time/timer.c b/kernel/time/timer.c index 85f1021ad459..9dd2a39cb3b0 100644 --- a/kernel/time/timer.c +++ b/kernel/time/timer.c @@ -1722,11 +1722,14 @@ static inline void __run_timers(struct timer_base *base) time_after_eq(jiffies, base->next_expiry)) { levels = collect_expired_timers(base, heads); /* - * The only possible reason for not finding any expired - * timer at this clk is that all matching timers have been - * dequeued. + * The two possible reasons for not finding any expired + * timer at this clk are that all matching timers have been + * dequeued or no timer has been queued since + * base::next_expiry was set to base::clk + + * NEXT_TIMER_MAX_DELTA. */ - WARN_ON_ONCE(!levels && !base->next_expiry_recalc); + WARN_ON_ONCE(!levels && !base->next_expiry_recalc + && base->timers_pending); base->clk++; base->next_expiry = __next_timer_interrupt(base); |