linux-kernel - [PATCH 2/6] sched/fair: Use task_work_queued() on numa

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Message-ID: <20250410152327.24504-3-frederic@kernel.org>
Date: Thu, 10 Apr 2025 17:23:23 +0200
From: Frederic Weisbecker <frederic@...nel.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Frederic Weisbecker <frederic@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Michal Hocko <mhocko@...nel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	linux-mm@...ck.org
Subject: [PATCH 2/6] sched/fair: Use task_work_queued() on numa_work

Remove the ad-hoc implementation of task_work_queued().

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

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index e43993a4e580..c6ffa2fdbbd6 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3317,7 +3317,6 @@ static void task_numa_work(struct callback_head *work)
 
 	WARN_ON_ONCE(p != container_of(work, struct task_struct, numa_work));
 
-	work->next = work;
 	/*
 	 * Who cares about NUMA placement when they're dying.
 	 *
@@ -3565,8 +3564,6 @@ void init_numa_balancing(unsigned long clone_flags, struct task_struct *p)
 	p->numa_scan_seq		= mm ? mm->numa_scan_seq : 0;
 	p->numa_scan_period		= sysctl_numa_balancing_scan_delay;
 	p->numa_migrate_retry		= 0;
-	/* Protect against double add, see task_tick_numa and task_numa_work */
-	p->numa_work.next		= &p->numa_work;
 	p->numa_faults			= NULL;
 	p->numa_pages_migrated		= 0;
 	p->total_numa_faults		= 0;
@@ -3607,7 +3604,7 @@ static void task_tick_numa(struct rq *rq, struct task_struct *curr)
 	/*
 	 * We don't care about NUMA placement if we don't have memory.
 	 */
-	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;
 
 	/*
-- 
2.48.1