Commit ddfc7103 authored by Juri Lelli's avatar Juri Lelli Committed by Peter Zijlstra

sched/deadline: Fix BUG_ON condition for deboosted tasks

Tasks the are being deboosted from SCHED_DEADLINE might enter
enqueue_task_dl() one last time and hit an erroneous BUG_ON condition:
since they are not boosted anymore, the if (is_dl_boosted()) branch is
not taken, but the else if (!dl_prio) is and inside this one we
BUG_ON(!is_dl_boosted), which is of course false (BUG_ON triggered)
otherwise we had entered the if branch above. Long story short, the
current condition doesn't make sense and always leads to triggering of a
BUG.

Fix this by only checking enqueue flags, properly: ENQUEUE_REPLENISH has
to be present, but additional flags are not a problem.

Fixes: 64be6f1f ("sched/deadline: Don't replenish from a !SCHED_DEADLINE entity")
Signed-off-by: default avatarJuri Lelli <juri.lelli@redhat.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20220714151908.533052-1-juri.lelli@redhat.com
parent ff699273
...@@ -1701,7 +1701,10 @@ static void enqueue_task_dl(struct rq *rq, struct task_struct *p, int flags) ...@@ -1701,7 +1701,10 @@ static void enqueue_task_dl(struct rq *rq, struct task_struct *p, int flags)
* the throttle. * the throttle.
*/ */
p->dl.dl_throttled = 0; p->dl.dl_throttled = 0;
BUG_ON(!is_dl_boosted(&p->dl) || flags != ENQUEUE_REPLENISH); if (!(flags & ENQUEUE_REPLENISH))
printk_deferred_once("sched: DL de-boosted task PID %d: REPLENISH flag missing\n",
task_pid_nr(p));
return; return;
} }
......
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