diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2026-01-15 09:25:37 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2026-01-15 21:57:53 +0100 |
| commit | e008ec6c7904ed99d3b2cb634b6545b008a99288 (patch) | |
| tree | b73bd5064e7d484ba4a241a1f16c0471a3e8ddb0 /kernel | |
| parent | 53439363c0a111f11625982b69c88ee2ce8608ec (diff) | |
sched: Deadline has dynamic priority
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: ff77e4685359 ("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
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched/core.c | 2 | ||||
| -rw-r--r-- | kernel/sched/syscalls.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 4d925d7ad097..045f83ad261e 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -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; diff --git a/kernel/sched/syscalls.c b/kernel/sched/syscalls.c index cb337de679b8..6f10db3646e7 100644 --- a/kernel/sched/syscalls.c +++ b/kernel/sched/syscalls.c @@ -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; } |