linux-kernel - [tip: sched/core] sched/smp: Use the SMP version of the scheduler syscalls

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Message-ID: <174980023505.406.1464364783824682136.tip-bot2@tip-bot2>
Date: Fri, 13 Jun 2025 07:37:15 -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 scheduler syscalls

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

Commit-ID:     8a9246ddc16c0feaa3b09ca9d2e30fbfa88d09de
Gitweb:        https://git.kernel.org/tip/8a9246ddc16c0feaa3b09ca9d2e30fbfa88d09de
Author:        Ingo Molnar <mingo@...nel.org>
AuthorDate:    Wed, 28 May 2025 10:09:13 +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 scheduler syscalls

Simplify the scheduler by making CONFIG_SMP=y code in
idle_cpu(), __sched_setscheduler() and sched_setaffinity()
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/20250528080924.2273858-33-mingo@kernel.org
---
 kernel/sched/syscalls.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/kernel/sched/syscalls.c b/kernel/sched/syscalls.c
index d7fccf8..77ae87f 100644
--- a/kernel/sched/syscalls.c
+++ b/kernel/sched/syscalls.c
@@ -209,10 +209,8 @@ int idle_cpu(int cpu)
 	if (rq->nr_running)
 		return 0;
 
-#ifdef CONFIG_SMP
 	if (rq->ttwu_pending)
 		return 0;
-#endif
 
 	return 1;
 }
@@ -641,7 +639,6 @@ change:
 			goto unlock;
 		}
 #endif /* CONFIG_RT_GROUP_SCHED */
-#ifdef CONFIG_SMP
 		if (dl_bandwidth_enabled() && dl_policy(policy) &&
 				!(attr->sched_flags & SCHED_FLAG_SUGOV)) {
 			cpumask_t *span = rq->rd->span;
@@ -657,7 +654,6 @@ change:
 				goto unlock;
 			}
 		}
-#endif /* CONFIG_SMP */
 	}
 
 	/* Re-check policy now with rq lock held: */
@@ -1239,7 +1235,7 @@ long sched_setaffinity(pid_t pid, const struct cpumask *in_mask)
 	user_mask = alloc_user_cpus_ptr(NUMA_NO_NODE);
 	if (user_mask) {
 		cpumask_copy(user_mask, in_mask);
-	} else if (IS_ENABLED(CONFIG_SMP)) {
+	} else {
 		return -ENOMEM;
 	}