Commit 9d0df377 authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by Peter Zijlstra
Browse files

sched: Trigger warning if ->migration_disabled counter underflows. 



If migrate_enable() is used more often than its counter part then it
remains undetected and rq::nr_pinned will underflow, too.

Add a warning if migrate_enable() is attempted if without a matching a
migrate_disable().

Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20211129174654.668506-2-bigeasy@linutronix.de
parent 4e0d8463

kernel/sched/core.c

+3 −0
Original line number Diff line number Diff line
@@ -2173,6 +2173,9 @@ void migrate_enable(void) 
		return;

	}



	if (WARN_ON_ONCE(!p->migration_disabled))

		return;



	/*

	 * Ensure stop_task runs either before or after this, and that

	 * __set_cpus_allowed_ptr(SCA_MIGRATE_ENABLE) doesn't schedule().