Commit 8a9246dd authored by Ingo Molnar's avatar Ingo Molnar
Browse files

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: default avatarIngo Molnar <mingo@kernel.org>
Acked-by: default avatarPeter Zijlstra <peterz@infradead.org>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Shrikanth Hegde <sshegde@linux.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Valentin Schneider <vschneid@redhat.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://lore.kernel.org/r/20250528080924.2273858-33-mingo@kernel.org
parent 9d9af237

kernel/sched/syscalls.c

+1 −5
Original line number Diff line number Diff line
@@ -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 @@ int __sched_setscheduler(struct task_struct *p, 
			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 @@ int __sched_setscheduler(struct task_struct *p, 
				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;

	}