linux-kernel - [PATCH 29/43] sched/smp: Use the SMP version of the deadline scheduling class

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Message-ID: <20250528080924.2273858-30-mingo@kernel.org>
Date: Wed, 28 May 2025 10:09:10 +0200
From: Ingo Molnar <mingo@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Dietmar Eggemann <dietmar.eggemann@....com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Shrikanth Hegde <sshegde@...ux.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mel Gorman <mgorman@...e.de>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Juri Lelli <juri.lelli@...hat.com>
Subject: [PATCH 29/43] sched/smp: Use the SMP version of the deadline scheduling class

Simplify the scheduler by making formerly SMP-only primitives and data
structures unconditional.

Signed-off-by: Ingo Molnar <mingo@...nel.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: Peter Zijlstra <peterz@...radead.org>
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>
---
 kernel/sched/deadline.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 80dd95419eac..c36813af9bb3 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -3001,7 +3001,6 @@ 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
@@ -3030,13 +3029,6 @@ 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
-- 
2.45.2