linux-kernel - [GIT PULL] timers/nohz fix

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

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;
 		}
 	}