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Tue, 14 Apr 2026 11:25:30 -0700 (PDT) Sender: Message-ID: Date: Tue, 14 Apr 2026 18:25:28 +0000 Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Subject: Re: The "clockevents: Prevent timer interrupt starvation" patch causes lockups To: Frederic Weisbecker Cc: Eric Naim , Thomas Gleixner , LKML , Calvin Owens , Peter Zijlstra , Anna-Maria Behnsen , Ingo Molnar , John Stultz , Stephen Boyd , Alexander Viro , Christian Brauner , Jan Kara , linux-fsdevel@vger.kernel.org, Sebastian Reichel , linux-pm@vger.kernel.org, Pablo Neira Ayuso , Florian Westphal , Phil Sutter , netfilter-devel@vger.kernel.org, coreteam@netfilter.org References: <20260407083219.478203185@kernel.org> <20260407083247.562657657@kernel.org> <68d1e9ac-2780-4be3-8ee3-0788062dd3a4@gmail.com> Content-Language: en-US From: Hanabishi In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 14/04/2026 18:04, Frederic Weisbecker wrote: > Can you try the following? > > diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c > index b4d730604972..5c6dfd6bed28 100644 > --- a/kernel/time/clockevents.c > +++ b/kernel/time/clockevents.c > @@ -100,6 +100,7 @@ static int __clockevents_switch_state(struct clock_event_device *dev, > /* The clockevent device is getting replaced. Shut it down. */ > > case CLOCK_EVT_STATE_SHUTDOWN: > + dev->next_event_forced = 0; > if (dev->set_state_shutdown) > return dev->set_state_shutdown(dev); > return 0; > @@ -127,10 +128,12 @@ static int __clockevents_switch_state(struct clock_event_device *dev, > clockevent_get_state(dev))) > return -EINVAL; > > - if (dev->set_state_oneshot_stopped) > + if (dev->set_state_oneshot_stopped) { > + dev->next_event_forced = 0; > return dev->set_state_oneshot_stopped(dev); > - else > + } else { > return -ENOSYS; > + } > > default: > return -ENOSYS; > diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c > index 7e57fa31ee26..115e0bf01276 100644 > --- a/kernel/time/tick-broadcast.c > +++ b/kernel/time/tick-broadcast.c > @@ -108,6 +108,7 @@ static struct clock_event_device *tick_get_oneshot_wakeup_device(int cpu) > > static void tick_oneshot_wakeup_handler(struct clock_event_device *wd) > { > + wd->next_event_forced = 0; > /* > * If we woke up early and the tick was reprogrammed in the > * meantime then this may be spurious but harmless. This patch doesn't help me unfortunately. Thanks.