linux-kernel - [RT PATCH] sched/deadline: Make inactive timer run in hardirq context

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Message-Id: <20190731103715.4047-1-juri.lelli@redhat.com>
Date:   Wed, 31 Jul 2019 12:37:15 +0200
From:   Juri Lelli <juri.lelli@...hat.com>
To:     tglx@...utronix.de, bigeasy@...utronix.de, rostedt@...dmis.org
Cc:     linux-rt-users@...r.kernel.org, peterz@...radead.org,
        linux-kernel@...r.kernel.org, bristot@...hat.com,
        williams@...hat.com, Juri Lelli <juri.lelli@...hat.com>
Subject: [RT PATCH] sched/deadline: Make inactive timer run in hardirq context

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

Make it HRTIMER_MODE_REL_HARD.

Signed-off-by: Juri Lelli <juri.lelli@...hat.com>
---
Hi,

Both v4.19-rt and v5.2-rt need this.

Mainline "sched: Mark hrtimers to expire in hard interrupt context"
series needs this as well (20190726185753.077004842@...utronix.de in
particular). Do I need to send out a separate patch for it?

Best,

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

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 1794e152d888..0889674b8915 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -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;
 }
 
-- 
2.17.2