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

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Message-ID: <174980023332.406.10511179396125836461.tip-bot2@tip-bot2>
Date: Fri, 13 Jun 2025 07:37:13 -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 idle scheduling class

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

Commit-ID:     482c4dae75cbe3a3bc7109d6c2346e400facbea8
Gitweb:        https://git.kernel.org/tip/482c4dae75cbe3a3bc7109d6c2346e400facbea8
Author:        Ingo Molnar <mingo@...nel.org>
AuthorDate:    Wed, 28 May 2025 10:09:15 +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 idle scheduling class

Simplify the scheduler by making CONFIG_SMP=y code in the
idle scheduling classunconditional.

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/20250528080924.2273858-35-mingo@kernel.org
---
 kernel/sched/idle.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index 43d6e00..c39b089 100644
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -432,7 +432,6 @@ void cpu_startup_entry(enum cpuhp_state state)
  * idle-task scheduling class.
  */
 
-#ifdef CONFIG_SMP
 static int
 select_task_rq_idle(struct task_struct *p, int cpu, int flags)
 {
@@ -444,7 +443,6 @@ balance_idle(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
 {
 	return WARN_ON_ONCE(1);
 }
-#endif /* CONFIG_SMP */
 
 /*
  * Idle tasks are unconditionally rescheduled:
@@ -531,11 +529,9 @@ DEFINE_SCHED_CLASS(idle) = {
 	.put_prev_task		= put_prev_task_idle,
 	.set_next_task          = set_next_task_idle,
 
-#ifdef CONFIG_SMP
 	.balance		= balance_idle,
 	.select_task_rq		= select_task_rq_idle,
 	.set_cpus_allowed	= set_cpus_allowed_common,
-#endif
 
 	.task_tick		= task_tick_idle,