linux-kernel - [tip:timers/core] sched/deadline: Ensure inactive

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Message-ID: <tip-4394ba872c36255d25c6bde151b061f04655ebfb@git.kernel.org>
Date:   Thu, 1 Aug 2019 09:00:27 -0700
From:   tip-bot for Juri Lelli <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, juri.lelli@...hat.com, hpa@...or.com,
        mingo@...nel.org, tglx@...utronix.de
Subject: [tip:timers/core] sched/deadline: Ensure inactive_timer runs in
 hardirq context

Commit-ID:  4394ba872c36255d25c6bde151b061f04655ebfb
Gitweb:     https://git.kernel.org/tip/4394ba872c36255d25c6bde151b061f04655ebfb
Author:     Juri Lelli <juri.lelli@...hat.com>
AuthorDate: Wed, 31 Jul 2019 12:37:15 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Thu, 1 Aug 2019 17:43:20 +0200

sched/deadline: Ensure inactive_timer runs in hardirq context

SCHED_DEADLINE inactive timer needs to run in hardirq context (as
dl_task_timer already does) on PREEMPT_RT

Change the mode to HRTIMER_MODE_REL_HARD.

[ tglx: Fixed up the start site, so mode debugging works ]

Signed-off-by: Juri Lelli <juri.lelli@...hat.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: https://lkml.kernel.org/r/20190731103715.4047-1-juri.lelli@redhat.com

---
 kernel/sched/deadline.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 0359612d5443..83a663a34196 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -287,7 +287,7 @@ static void task_non_contending(struct task_struct *p)
 
 	dl_se->dl_non_contending = 1;
 	get_task_struct(p);
-	hrtimer_start(timer, ns_to_ktime(zerolag_time), HRTIMER_MODE_REL);
+	hrtimer_start(timer, ns_to_ktime(zerolag_time), HRTIMER_MODE_REL_HARD);
 }
 
 static void task_contending(struct sched_dl_entity *dl_se, int flags)
@@ -1292,7 +1292,7 @@ void init_dl_inactive_task_timer(struct sched_dl_entity *dl_se)
 {
 	struct hrtimer *timer = &dl_se->inactive_timer;
 
-	hrtimer_init(timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+	hrtimer_init(timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_HARD);
 	timer->function = inactive_task_timer;
 }