From: tip-bot for Anna-Maria Gleixner <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: bigeasy@linutronix.de, anna-maria@linutronix.de,
mingo@kernel.org, tglx@linutronix.de,
linux-kernel@vger.kernel.org, peterz@infradead.org,
hpa@zytor.com
Subject: [tip:timers/core] itimers: Prepare for PREEMPT_RT
Date: Thu, 1 Aug 2019 09:05:41 -0700 [thread overview]
Message-ID: <tip-cab46ec655eec1b5dbb0c17a25e19f67c539f00b@git.kernel.org> (raw)
In-Reply-To: <20190730223828.690771827@linutronix.de>
Commit-ID: cab46ec655eec1b5dbb0c17a25e19f67c539f00b
Gitweb: https://git.kernel.org/tip/cab46ec655eec1b5dbb0c17a25e19f67c539f00b
Author: Anna-Maria Gleixner <anna-maria@linutronix.de>
AuthorDate: Wed, 31 Jul 2019 00:33:51 +0200
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Thu, 1 Aug 2019 17:46:41 +0200
itimers: Prepare for PREEMPT_RT
Use the hrtimer_cancel_wait_running() synchronization mechanism to prevent
priority inversion and live locks on PREEMPT_RT.
As a benefit the retry loop gains the missing cpu_relax() on !RT.
[ tglx: Split out of combo patch ]
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20190730223828.690771827@linutronix.de
---
kernel/time/itimer.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/kernel/time/itimer.c b/kernel/time/itimer.c
index 02068b2d5862..9d26fd4ba4c0 100644
--- a/kernel/time/itimer.c
+++ b/kernel/time/itimer.c
@@ -213,6 +213,7 @@ again:
/* We are sharing ->siglock with it_real_fn() */
if (hrtimer_try_to_cancel(timer) < 0) {
spin_unlock_irq(&tsk->sighand->siglock);
+ hrtimer_cancel_wait_running(timer);
goto again;
}
expires = timeval_to_ktime(value->it_value);
next prev parent reply other threads:[~2019-08-01 16:05 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-bot for Anna-Maria Gleixner [this message]
2019-08-01 19:07 ` [tip:timers/core] " 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
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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