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Merge tag 'sched-urgent-2026-02-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull scheduler fix from Ingo Molnar:
 "Fix a regression in the deferrable dl_server code that can cause the
  dl_server to be stuck"

* tag 'sched-urgent-2026-02-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/deadline: Fix 'stuck' dl_server
This commit is contained in:
Linus Torvalds
2026-02-01 10:39:52 -08:00
parent 969b5726ac 1151354225
commit e53ada651a
1 changed files with 12 additions and 0 deletions
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12
kernel/sched/deadline.c
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@@ -1034,6 +1034,12 @@ static void update_dl_entity(struct sched_dl_entity *dl_se)
return;
}
/*
* When [4] D->A is followed by [1] A->B, dl_defer_running
* needs to be cleared, otherwise it will fail to properly
* start the zero-laxity timer.
*/
dl_se->dl_defer_running = 0;
replenish_dl_new_period(dl_se, rq);
} else if (dl_server(dl_se) && dl_se->dl_defer) {
/*
@@ -1655,6 +1661,12 @@ void dl_server_update(struct sched_dl_entity *dl_se, s64 delta_exec)
* dl_server_active = 1;
* enqueue_dl_entity()
* update_dl_entity(WAKEUP)
* if (dl_time_before() || dl_entity_overflow())
* dl_defer_running = 0;
* replenish_dl_new_period();
* // fwd period
* dl_throttled = 1;
* dl_defer_armed = 1;
* if (!dl_defer_running)
* dl_defer_armed = 1;
* dl_throttled = 1;