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sched: Deadline has dynamic priority

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While FIFO/RR have static priority, DEADLINE is a dynamic priority
scheme. Notably it has static priority -1. Do not assume the priority
doesn't change for deadline tasks just because the static priority
doesn't change.

This ensures DL always sees {DE,EN}QUEUE_MOVE where appropriate.

Fixes: ff77e46853 ("sched/rt: Fix PI handling vs. sched_setscheduler()")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Pierre Gondois <pierre.gondois@arm.com>
Tested-by: Juri Lelli <juri.lelli@redhat.com>
Link: https://patch.msgid.link/20260114130528.GB831285@noisy.programming.kicks-ass.net
This commit is contained in:
Peter Zijlstra
2026-01-15 09:25:37 +01:00
parent 53439363c0
commit e008ec6c79
2 changed files with 2 additions and 2 deletions
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2
kernel/sched/core.c
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@@ -7320,7 +7320,7 @@ void rt_mutex_setprio(struct task_struct *p, struct task_struct *pi_task)
trace_sched_pi_setprio(p, pi_task);
oldprio = p->prio;
if (oldprio == prio)
if (oldprio == prio && !dl_prio(prio))
queue_flag &= ~DEQUEUE_MOVE;
prev_class = p->sched_class;

2
kernel/sched/syscalls.c
View File

@@ -639,7 +639,7 @@ change:
* itself.
*/
newprio = rt_effective_prio(p, newprio);
if (newprio == oldprio)
if (newprio == oldprio && !dl_prio(newprio))
queue_flags &= ~DEQUEUE_MOVE;
}