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From: Ingo Molnar <mingo@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Peter Zijlstra" <a.p.zijlstra@chello.nl>,
	"Frédéric Weisbecker" <fweisbec@gmail.com>,
	"Andrew Morton" <akpm@linux-foundation.org>
Subject: [GIT PULL] timers/nohz fix
Date: Sat, 11 Feb 2017 19:15:26 +0100	[thread overview]
Message-ID: <20170211181526.GA12092@gmail.com> (raw)

Linus,

Please pull the latest timers-urgent-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers-urgent-for-linus

   # HEAD: 7bdb59f1ad474bd7161adc8f923cdef10f2638d1 tick/nohz: Fix possible missing clock reprog after tick soft restart

Fix a sporadic missed timer hw reprogramming bug that can result in random delays.

 Thanks,

	Ingo

------------------>
Frederic Weisbecker (1):
      tick/nohz: Fix possible missing clock reprog after tick soft restart


 kernel/time/tick-sched.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 74e0388cc88d..fc6f740d0277 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -725,6 +725,11 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
 		 */
 		if (delta == 0) {
 			tick_nohz_restart(ts, now);
+			/*
+			 * Make sure next tick stop doesn't get fooled by past
+			 * clock deadline
+			 */
+			ts->next_tick = 0;
 			goto out;
 		}
 	}

                 reply	other threads:[~2017-02-11 18:15 UTC|newest]

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