linux-kernel - [PATCH 24/43] sched/smp: Use the SMP version of __task_needs_rq

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Message-ID: <20250528080924.2273858-25-mingo@kernel.org>
Date: Wed, 28 May 2025 10:09:05 +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 24/43] sched/smp: Use the SMP version of __task_needs_rq_lock()

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/core.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 850f39fe5b8f..9eefc74f35a8 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4308,14 +4308,12 @@ static bool __task_needs_rq_lock(struct task_struct *p)
 	if (p->on_rq)
 		return true;
 
-#ifdef CONFIG_SMP
 	/*
 	 * Ensure the task has finished __schedule() and will not be referenced
 	 * anymore. Again, see try_to_wake_up() for a longer comment.
 	 */
 	smp_rmb();
 	smp_cond_load_acquire(&p->on_cpu, !VAL);
-#endif
 
 	return false;
 }
-- 
2.45.2