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sched: Trigger warning if ->migration_disabled counter underflows.

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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: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20211129174654.668506-2-bigeasy@linutronix.de
This commit is contained in:
Sebastian Andrzej Siewior 2021-11-29 18:46:44 +01:00 committed by Peter Zijlstra
parent 4e0d846344
commit 9d0df37797
1 changed files with 3 additions and 0 deletions
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3
kernel/sched/core.c
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@ -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().