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

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Message-ID: <174980023243.406.520810220477726843.tip-bot2@tip-bot2>
Date: Fri, 13 Jun 2025 07:37:12 -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 stop-CPU
 scheduling class

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

Commit-ID:     caf5bde9c542f0cbdf2c91db7ea9743e33941d91
Gitweb:        https://git.kernel.org/tip/caf5bde9c542f0cbdf2c91db7ea9743e33941d91
Author:        Ingo Molnar <mingo@...nel.org>
AuthorDate:    Wed, 28 May 2025 10:09:16 +02:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Fri, 13 Jun 2025 08:47:21 +02:00

sched/smp: Use the SMP version of the stop-CPU scheduling class

Simplify the scheduler by making CONFIG_SMP=y code in the stop-CPU
scheduling class 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/20250528080924.2273858-36-mingo@kernel.org
---
 kernel/sched/stop_task.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/kernel/sched/stop_task.c b/kernel/sched/stop_task.c
index 1c1bbc6..2d4e279 100644
--- a/kernel/sched/stop_task.c
+++ b/kernel/sched/stop_task.c
@@ -9,7 +9,6 @@
  */
 #include "sched.h"
 
-#ifdef CONFIG_SMP
 static int
 select_task_rq_stop(struct task_struct *p, int cpu, int flags)
 {
@@ -21,7 +20,6 @@ balance_stop(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
 {
 	return sched_stop_runnable(rq);
 }
-#endif /* CONFIG_SMP */
 
 static void
 wakeup_preempt_stop(struct rq *rq, struct task_struct *p, int flags)
@@ -107,11 +105,9 @@ DEFINE_SCHED_CLASS(stop) = {
 	.put_prev_task		= put_prev_task_stop,
 	.set_next_task          = set_next_task_stop,
 
-#ifdef CONFIG_SMP
 	.balance		= balance_stop,
 	.select_task_rq		= select_task_rq_stop,
 	.set_cpus_allowed	= set_cpus_allowed_common,
-#endif
 
 	.task_tick		= task_tick_stop,