linux-kernel - Re: [patch-rt] hotplug, hrtimer: Migrate expired/deferred timers during cpu offline

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Date:   Thu, 17 Aug 2017 19:17:21 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Mike Galbraith <efault@....de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [patch-rt] hotplug, hrtimer: Migrate expired/deferred timers
 during cpu offline

On 2017-08-17 18:50:42 [+0200], To Mike Galbraith wrote:
> __remove_hrtimer() shouldn't be required because it has been done
> already. It should be enough to just list_splice() one list to the
> other and raise the softirq afterwards.

Mike, can you check this please:

diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index 55839ff2bba6..4b9264e0d363 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -1802,6 +1802,11 @@ static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
 		 */
 		enqueue_hrtimer(timer, new_base);
 	}
+#ifdef CONFIG_PREEMPT_RT_BASE
+	list_splice_tail(&old_base->expired, &new_base->expired);
+	if (!list_empty(&new_base->expired))
+		raise_softirq_irqoff(HRTIMER_SOFTIRQ);
+#endif
 }
 
 int hrtimers_dead_cpu(unsigned int scpu)
-- 
2.13.2

Sebastian