linux-kernel - Re: [PATCH 1/6 v2] task_work: Provide means to check if a work is queued

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Message-ID: <Z-K8yaPo632B6wLj@localhost.localdomain>
Date: Tue, 25 Mar 2025 15:25:13 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: Oleg Nesterov <oleg@...hat.com>
Cc: LKML <linux-kernel@...r.kernel.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>, linux-mm@...ck.org
Subject: Re: [PATCH 1/6 v2] task_work: Provide means to check if a work is
 queued

Le Mon, Feb 10, 2025 at 01:43:41PM +0100, Oleg Nesterov a écrit :
> On 02/09, Frederic Weisbecker wrote:
> >
> > @@ -56,6 +56,8 @@ int task_work_add(struct task_struct *task, struct callback_head *work,
> >  {
> >  	struct callback_head *head;
> >
> > +	work->next = TASK_WORK_DEQUEUED;
> 
> Do we really need to do this at the start of task_work_add() ?
> 
> If the caller didn't do init_task_work() before and task_work_add()
> returns -EINVAL we probably do not care?

Yes good point. Let me fix that...

> 
> Reviewed-by: Oleg Nesterov <oleg@...hat.com>
>