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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2021-11-29 18:46:44 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-12-04 10:56:22 +0100 |
| commit | 9d0df37797453f168afdb2e6fd0353c73718ae9a (patch) | |
| tree | 31ff628d481cc9c76881994ff59d69840c3e5a4c /kernel/sched | |
| parent | 4e0d84634445ed550498d613a49ea8f6cfa5e66c (diff) | |
| download | lwn-9d0df37797453f168afdb2e6fd0353c73718ae9a.tar.gz lwn-9d0df37797453f168afdb2e6fd0353c73718ae9a.zip | |
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: 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
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/core.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 3c9b0fda64ac..300218ad98a2 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -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(). |