linux-kernel - [tip: timers/core] tick: Mark sched_timer to expire in hard interrupt context

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Message-ID: <156699021381.13479.1712414321907002833.tip-bot2@tip-bot2>
Date:   Wed, 28 Aug 2019 11:03:33 -0000
From:   "tip-bot2 for Sebastian Andrzej Siewior" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
        linux-kernel@...r.kernel.org
Subject: [tip: timers/core] tick: Mark sched_timer to expire in hard interrupt context

The following commit has been merged into the timers/core branch of tip:

Commit-ID:     71fed982d63cb2bb88db6f36059e3b14a7913846
Gitweb:        https://git.kernel.org/tip/71fed982d63cb2bb88db6f36059e3b14a7913846
Author:        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
AuthorDate:    Fri, 23 Aug 2019 13:38:45 +02:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Wed, 28 Aug 2019 13:01:26 +02:00

tick: Mark sched_timer to expire in hard interrupt context

sched_timer must be initialized with the _HARD mode suffix to ensure expiry
in hard interrupt context on RT.

The previous conversion to HARD expiry mode missed on one instance in
tick_nohz_switch_to_nohz(). Fix it up.

Fixes: 902a9f9c50905 ("tick: Mark tick related hrtimers to expiry in hard interrupt context")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: https://lkml.kernel.org/r/20190823113845.12125-3-bigeasy@linutronix.de

---
 kernel/time/tick-sched.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 01ff32a..9558517 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -1233,7 +1233,7 @@ static void tick_nohz_switch_to_nohz(void)
 	 * Recycle the hrtimer in ts, so we can share the
 	 * hrtimer_forward with the highres code.
 	 */
-	hrtimer_init(&ts->sched_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
+	hrtimer_init(&ts->sched_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_HARD);
 	/* Get the next period */
 	next = tick_init_jiffy_update();