linux-kernel - [PATCH 3/6 v2] sched: Use task_work_queued() on cid

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Message-ID: <20250209223005.11519-4-frederic@kernel.org>
Date: Sun,  9 Feb 2025 23:30:01 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Frederic Weisbecker <frederic@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Valentin Schneider <vschneid@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Oleg Nesterov <oleg@...hat.com>,
	linux-mm@...ck.org
Subject: [PATCH 3/6 v2] sched: Use task_work_queued() on cid_work

Remove the ad-hoc implementation of task_work_queued()

Reviewed-by: Valentin Schneider <vschneid@...hat.com>
Signed-off-by: Frederic Weisbecker <frederic@...nel.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 165c90ba64ea..606f596a6e0d 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -10538,7 +10538,6 @@ static void task_mm_cid_work(struct callback_head *work)
 
 	SCHED_WARN_ON(t != container_of(work, struct task_struct, cid_work));
 
-	work->next = work;	/* Prevent double-add */
 	if (t->flags & PF_EXITING)
 		return;
 	mm = t->mm;
@@ -10582,7 +10581,6 @@ 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);
 }
 
@@ -10591,8 +10589,7 @@ 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;
-- 
2.46.0