[PATCH 3/6] sched: Use task_work_queued() on cid_work

[Frederic Weisbecker <frederic@kernel.org>]

Remove the ad-hoc implementation of task_work_queued()

Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
---
 kernel/sched/core.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index cfaca3040b2f..add41254b6e5 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -10576,7 +10576,6 @@ static void task_mm_cid_work(struct callback_head *work)
 
 	WARN_ON_ONCE(t != container_of(work, struct task_struct, cid_work));
 
-	work->next = work;	/* Prevent double-add */
 	if (t->flags & PF_EXITING)
 		return;
 	mm = t->mm;
@@ -10620,7 +10619,6 @@ void init_sched_mm_cid(struct task_struct *t)
 		if (mm_users == 1)
 			mm->mm_cid_next_scan = jiffies + msecs_to_jiffies(MM_CID_SCAN_DELAY);
 	}
-	t->cid_work.next = &t->cid_work;	/* Protect against double add */
 	init_task_work(&t->cid_work, task_mm_cid_work);
 }
 
@@ -10629,8 +10627,7 @@ void task_tick_mm_cid(struct rq *rq, struct task_struct *curr)
 	struct callback_head *work = &curr->cid_work;
 	unsigned long now = jiffies;
 
-	if (!curr->mm || (curr->flags & (PF_EXITING | PF_KTHREAD)) ||
-	    work->next != work)
+	if (!curr->mm || (curr->flags & (PF_EXITING | PF_KTHREAD)) || task_work_queued(work))
 		return;
 	if (time_before(now, READ_ONCE(curr->mm->mm_cid_next_scan)))
 		return;
-- 
2.48.1