Commit b5a4e2bb authored by Valentin Schneider's avatar Valentin Schneider Committed by Ingo Molnar
Browse files

Revert "sched/core: Take the hotplug lock in sched_init_smp()" 



This reverts commit 40fa3780.

Now that we have a system-wide muting of hotplug lockdep during init,
this is no longer needed.

Signed-off-by: default avatarValentin Schneider <valentin.schneider@arm.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Cc: cai@gmx.us
Cc: daniel.lezcano@linaro.org
Cc: dietmar.eggemann@arm.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: longman@redhat.com
Cc: marc.zyngier@arm.com
Cc: mark.rutland@arm.com
Link: https://lkml.kernel.org/r/1545243796-23224-3-git-send-email-valentin.schneider@arm.com


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent ce48c457

kernel/sched/core.c

+1 −4
Original line number Diff line number Diff line
@@ -5867,14 +5867,11 @@ void __init sched_init_smp(void) 
	/*

	 * There's no userspace yet to cause hotplug operations; hence all the

	 * CPU masks are stable and all blatant races in the below code cannot

	 * happen. The hotplug lock is nevertheless taken to satisfy lockdep,

	 * but there won't be any contention on it.

	 * happen.

	 */

	cpus_read_lock();

	mutex_lock(&sched_domains_mutex);

	sched_init_domains(cpu_active_mask);

	mutex_unlock(&sched_domains_mutex);

	cpus_read_unlock();



	/* Move init over to a non-isolated CPU */

	if (set_cpus_allowed_ptr(current, housekeeping_cpumask(HK_FLAG_DOMAIN)) < 0)