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05 April 2024, 19:05:47 UTC
Revision ddfc710395cccc61247348df9eb18ea50321cbed authored by Juri Lelli on 14 July 2022, 15:19:08 UTC, committed by Peter Zijlstra on 21 July 2022, 08:35:28 UTC 
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: 64be6f1f5f71 ("sched/deadline: Don't replenish from a !SCHED_DEADLINE entity")
Signed-off-by: Juri Lelli <juri.lelli@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20220714151908.533052-1-juri.lelli@redhat.com
1 parent ff69927
History
Tip revision: ddfc710395cccc61247348df9eb18ea50321cbed authored by Juri Lelli on 14 July 2022, 15:19:08 UTC
sched/deadline: Fix BUG_ON condition for deboosted tasks
Tip revision: ddfc710
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