From: Peter Zijlstra <peterz@infradead.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@kernel.org>,
Sebastian Siewior <bigeasy@linutronix.de>,
Anna-Maria Gleixner <anna-maria@linutronix.de>,
Steven Rostedt <rostedt@goodmis.org>,
Julia Cartwright <julia@ni.com>
Subject: Re: [patch 7/7] posix-timers: Prepare for PREEMPT_RT
Date: Wed, 31 Jul 2019 11:49:17 +0200 [thread overview]
Message-ID: <20190731094917.GR31381@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20190730223829.058247862@linutronix.de>
On Wed, Jul 31, 2019 at 12:33:55AM +0200, Thomas Gleixner wrote:
> +static struct k_itimer *timer_wait_running(struct k_itimer *timer,
> + unsigned long *flags)
> +{
> + const struct k_clock *kc = READ_ONCE(timer->kclock);
> + timer_t timer_id = READ_ONCE(timer->it_id);
> +
> + /* Prevent kfree(timer) after dropping the lock */
> + rcu_read_lock();
> + unlock_timer(timer, *flags);
> +
> + if (kc->timer_arm == common_hrtimer_arm)
> + hrtimer_cancel_wait_running(&timer->it.real.timer);
> + else if (kc == &alarm_clock)
> + hrtimer_cancel_wait_running(&timer->it.alarm.alarmtimer.timer);
else WARN();
> + rcu_read_unlock();
> +
> + /* Relock the timer. It might be not longer hashed. */
> + return lock_timer(timer_id, flags);
> +}
next prev parent reply other threads:[~2019-07-31 9:49 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-30 22:33 [patch 0/7] posix-timers: Prepare for PREEMPT_RT - part 1 Thomas Gleixner
2019-07-30 22:33 ` [patch 1/7] alarmtimer: Prepare for PREEMPT_RT Thomas Gleixner
2019-08-01 16:04 ` [tip:timers/core] " tip-bot for Anna-Maria Gleixner
2019-08-01 19:06 ` tip-bot for Anna-Maria Gleixner
2019-07-30 22:33 ` [patch 2/7] timerfd: " Thomas Gleixner
2019-08-01 16:04 ` [tip:timers/core] " tip-bot for Anna-Maria Gleixner
2019-08-01 19:07 ` tip-bot for Anna-Maria Gleixner
2019-07-30 22:33 ` [patch 3/7] itimers: " Thomas Gleixner
2019-08-01 16:05 ` [tip:timers/core] " tip-bot for Anna-Maria Gleixner
2019-08-01 19:07 ` tip-bot for Anna-Maria Gleixner
2019-07-30 22:33 ` [patch 4/7] posix-timers: Cleanup the flag/flags confusion Thomas Gleixner
2019-08-01 16:06 ` [tip:timers/core] " tip-bot for Anna-Maria Gleixner
2019-08-01 19:08 ` tip-bot for Thomas Gleixner
2019-07-30 22:33 ` [patch 5/7] posix-timers: Rework cancel retry loops Thomas Gleixner
2019-08-01 16:07 ` [tip:timers/core] " tip-bot for Thomas Gleixner
2019-08-01 19:09 ` tip-bot for Thomas Gleixner
2019-07-30 22:33 ` [patch 6/7] posix-timers: Move rcu_head out of it union Thomas Gleixner
2019-08-01 16:08 ` [tip:timers/core] " tip-bot for Sebastian Andrzej Siewior
2019-08-01 19:09 ` tip-bot for Sebastian Andrzej Siewior
2019-07-30 22:33 ` [patch 7/7] posix-timers: Prepare for PREEMPT_RT Thomas Gleixner
2019-07-31 9:49 ` Peter Zijlstra [this message]
2019-07-31 11:03 ` Thomas Gleixner
2019-08-01 16:08 ` [tip:timers/core] " tip-bot for Thomas Gleixner
2019-08-01 19:10 ` tip-bot for Thomas Gleixner
2019-07-31 9:49 ` [patch 0/7] posix-timers: Prepare for PREEMPT_RT - part 1 Peter Zijlstra
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