from looking at the code, it seems that the softirq is only raised (in
the !base->active_timers case) if we have also an expired timer
(time_before_eq() is true). This patch ensures that the timer softirq is
also raised in the !base->active_timers && no timer expired.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
---
kernel/timer.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/kernel/timer.c b/kernel/timer.c
index 6b3c172..b04c879 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1453,6 +1453,7 @@ static void run_timer_softirq(struct softirq_action *h)
void run_local_timers(void)
{
struct tvec_base *base = __this_cpu_read(tvec_bases);
+ bool need_raise = false;
hrtimer_run_queues();
/*
@@ -1470,12 +1471,17 @@ void run_local_timers(void)
#ifdef CONFIG_PREEMPT_RT_FULL
/* On RT, irq work runs from softirq */
if (!irq_work_needs_cpu())
-#endif
goto out;
+ need_raise = true;
+#else
+ goto out;
+#endif
}
/* Check whether the next pending timer has expired */
if (time_before_eq(base->next_timer, jiffies))
+ need_raise = true;
+ if (need_raise)
raise_softirq(TIMER_SOFTIRQ);
out:
#ifdef CONFIG_PREEMPT_RT_FULL
--
1.8.5.3
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