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sched_ext: Factor out scx_link_sched() and scx_unlink_sched()

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Factor out scx_link_sched() and scx_unlink_sched() functions to reduce
code duplication in the scheduler enable/disable paths.

No functional change.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
This commit is contained in:
Tejun Heo
2026-03-06 07:58:04 -10:00
parent 0d8c551dd5
commit 54be8de423
1 changed files with 31 additions and 22 deletions
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53
kernel/sched/ext.c
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@@ -4830,6 +4830,33 @@ static void refresh_watchdog(void)
cancel_delayed_work_sync(&scx_watchdog_work);
}
static void scx_link_sched(struct scx_sched *sch)
{
scoped_guard(raw_spinlock_irq, &scx_sched_lock) {
#ifdef CONFIG_EXT_SUB_SCHED
struct scx_sched *parent = scx_parent(sch);
if (parent)
list_add_tail(&sch->sibling, &parent->children);
#endif /* CONFIG_EXT_SUB_SCHED */
list_add_tail_rcu(&sch->all, &scx_sched_all);
}
refresh_watchdog();
}
static void scx_unlink_sched(struct scx_sched *sch)
{
scoped_guard(raw_spinlock_irq, &scx_sched_lock) {
#ifdef CONFIG_EXT_SUB_SCHED
if (scx_parent(sch))
list_del_init(&sch->sibling);
#endif /* CONFIG_EXT_SUB_SCHED */
list_del_rcu(&sch->all);
}
refresh_watchdog();
}
#ifdef CONFIG_EXT_SUB_SCHED
static DECLARE_WAIT_QUEUE_HEAD(scx_unlink_waitq);
@@ -4979,12 +5006,7 @@ static void scx_sub_disable(struct scx_sched *sch)
synchronize_rcu_expedited();
disable_bypass_dsp(sch);
raw_spin_lock_irq(&scx_sched_lock);
list_del_init(&sch->sibling);
list_del_rcu(&sch->all);
raw_spin_unlock_irq(&scx_sched_lock);
refresh_watchdog();
scx_unlink_sched(sch);
mutex_unlock(&scx_enable_mutex);
@@ -5120,11 +5142,7 @@ static void scx_root_disable(struct scx_sched *sch)
if (sch->ops.exit)
SCX_CALL_OP(sch, SCX_KF_UNLOCKED, exit, NULL, ei);
raw_spin_lock_irq(&scx_sched_lock);
list_del_rcu(&sch->all);
raw_spin_unlock_irq(&scx_sched_lock);
refresh_watchdog();
scx_unlink_sched(sch);
/*
* scx_root clearing must be inside cpus_read_lock(). See
@@ -5888,11 +5906,7 @@ static void scx_root_enable_workfn(struct kthread_work *work)
*/
rcu_assign_pointer(scx_root, sch);
raw_spin_lock_irq(&scx_sched_lock);
list_add_tail_rcu(&sch->all, &scx_sched_all);
raw_spin_unlock_irq(&scx_sched_lock);
refresh_watchdog();
scx_link_sched(sch);
scx_idle_enable(ops);
@@ -6157,12 +6171,7 @@ static void scx_sub_enable_workfn(struct kthread_work *work)
goto out_put_cgrp;
}
raw_spin_lock_irq(&scx_sched_lock);
list_add_tail(&sch->sibling, &parent->children);
list_add_tail_rcu(&sch->all, &scx_sched_all);
raw_spin_unlock_irq(&scx_sched_lock);
refresh_watchdog();
scx_link_sched(sch);
if (sch->level >= SCX_SUB_MAX_DEPTH) {
scx_error(sch, "max nesting depth %d violated",