linux-kernel - [tip: sched/core] sched/smp: Use the SMP version of the deadline scheduling class

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Message-ID: <174980023775.406.17404450194416335798.tip-bot2@tip-bot2>
Date: Fri, 13 Jun 2025 07:37:17 -0000
From: "tip-bot2 for Ingo Molnar" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Ingo Molnar <mingo@...nel.org>, Peter Zijlstra <peterz@...radead.org>,
 Dietmar Eggemann <dietmar.eggemann@....com>,
 Juri Lelli <juri.lelli@...hat.com>,
 Linus Torvalds <torvalds@...ux-foundation.org>, Mel Gorman <mgorman@...e.de>,
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
 Shrikanth Hegde <sshegde@...ux.ibm.com>, Steven Rostedt <rostedt@...dmis.org>,
 Valentin Schneider <vschneid@...hat.com>,
 Vincent Guittot <vincent.guittot@...aro.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched/smp: Use the SMP version of the deadline
 scheduling class

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

Commit-ID:     6324dce8f6262ec2049494af311e5418bc733341
Gitweb:        https://git.kernel.org/tip/6324dce8f6262ec2049494af311e5418bc733341
Author:        Ingo Molnar <mingo@...nel.org>
AuthorDate:    Wed, 28 May 2025 10:09:10 +02:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Fri, 13 Jun 2025 08:47:20 +02:00

sched/smp: Use the SMP version of the deadline scheduling class

Simplify the scheduler by making CONFIG_SMP=y code
in prio_changed_dl() unconditional.

Signed-off-by: Ingo Molnar <mingo@...nel.org>
Acked-by: Peter Zijlstra <peterz@...radead.org>
Cc: Dietmar Eggemann <dietmar.eggemann@....com>
Cc: Juri Lelli <juri.lelli@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: Shrikanth Hegde <sshegde@...ux.ibm.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Valentin Schneider <vschneid@...hat.com>
Cc: Vincent Guittot <vincent.guittot@...aro.org>
Link: https://lore.kernel.org/r/20250528080924.2273858-30-mingo@kernel.org
---
 kernel/sched/deadline.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index bf9b70a..0f30697 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -3005,7 +3005,6 @@ static void prio_changed_dl(struct rq *rq, struct task_struct *p,
 	if (!task_on_rq_queued(p))
 		return;
 
-#ifdef CONFIG_SMP
 	/*
 	 * This might be too much, but unfortunately
 	 * we don't have the old deadline value, and
@@ -3034,13 +3033,6 @@ static void prio_changed_dl(struct rq *rq, struct task_struct *p,
 		    dl_time_before(p->dl.deadline, rq->curr->dl.deadline))
 			resched_curr(rq);
 	}
-#else /* !CONFIG_SMP: */
-	/*
-	 * We don't know if p has a earlier or later deadline, so let's blindly
-	 * set a (maybe not needed) rescheduling point.
-	 */
-	resched_curr(rq);
-#endif /* !CONFIG_SMP */
 }
 
 #ifdef CONFIG_SCHED_CORE