linux-kernel - [PATCH 34/43] sched/smp: Use the SMP version of the idle scheduling class

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Message-ID: <20250528080924.2273858-35-mingo@kernel.org>
Date: Wed, 28 May 2025 10:09:15 +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 34/43] sched/smp: Use the SMP version of the idle 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/idle.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index cb01b063d733..2571ce6908a1 100644
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -427,7 +427,6 @@ 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)
 {
@@ -439,7 +438,6 @@ 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:
@@ -526,11 +524,9 @@ 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,
 
-- 
2.45.2