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sched_ext: Clean up SCX_EXIT_NONE handling in scx_disable_workfn()

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With the global states and disable machinery moved into scx_sched,
scx_disable_workfn() can only be scheduled and run for the specific
scheduler instance. This makes it impossible for scx_disable_workfn() to see
SCX_EXIT_NONE. Turn that condition into WARN_ON_ONCE().

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
Acked-by: Changwoo Min <changwoo@igalia.com>
This commit is contained in:
Tejun Heo 2025-04-29 08:40:11 -10:00
parent bff3b5aec1
commit 9ba7f37e5b
1 changed files with 2 additions and 6 deletions
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8
kernel/sched/ext.c
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@ -4752,13 +4752,9 @@ static void scx_disable_workfn(struct kthread_work *work)
kind = atomic_read(&sch->exit_kind);
while (true) {
/*
* NONE indicates that a new scx_ops has been registered since
* disable was scheduled - don't kill the new ops. DONE
* indicates that the ops has already been disabled.
*/
if (kind == SCX_EXIT_NONE || kind == SCX_EXIT_DONE)
if (kind == SCX_EXIT_DONE) /* already disabled? */
return;
WARN_ON_ONCE(kind == SCX_EXIT_NONE);
if (atomic_try_cmpxchg(&sch->exit_kind, &kind, SCX_EXIT_DONE))
break;
}