| From | Sebastian Andrzej Siewior <> | Subject | [PATCH 01/11] sched: Trigger warning if ->migration_disabled counter underflows. | Date | Mon, 29 Nov 2021 18:46:44 +0100 |
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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> --- kernel/sched/core.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 76f9deeaa9420..02be3f6144e97 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2171,6 +2171,8 @@ void migrate_enable(void) if (p->migration_disabled > 1) { p->migration_disabled--; return; + } else if (WARN_ON_ONCE(p->migration_disabled == 0)) { + return; } /* -- 2.34.0
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