linux-kernel - Re: [PATCH 13/17] workqueue: Remove WORK_OFFQ

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Date: Tue, 20 Feb 2024 15:23:53 +0800
From: Lai Jiangshan <jiangshanlai@...il.com>
To: Tejun Heo <tj@...nel.org>
Cc: torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org, 
	allen.lkml@...il.com, kernel-team@...a.com
Subject: Re: [PATCH 13/17] workqueue: Remove WORK_OFFQ_CANCELING

Hello, Tejun

On Sat, Feb 17, 2024 at 2:06 AM Tejun Heo <tj@...nel.org> wrote:

> @@ -2631,19 +2567,13 @@ bool mod_delayed_work_on(int cpu, struct workqueue_struct *wq,
>                          struct delayed_work *dwork, unsigned long delay)
>  {
>         unsigned long irq_flags;
> -       int ret;
> +       bool ret;
>
> -       do {
> -               ret = try_to_grab_pending(&dwork->work, WORK_CANCEL_DELAYED,
> -                                         &irq_flags);
> -       } while (unlikely(ret == -EAGAIN));
> +       ret = work_grab_pending(&dwork->work, WORK_CANCEL_DELAYED, &irq_flags);
>
> -       if (likely(ret >= 0)) {
> -               __queue_delayed_work(cpu, wq, dwork, delay);
> -               local_irq_restore(irq_flags);
> -       }
> +       __queue_delayed_work(cpu, wq, dwork, delay);

The disable count has to be checked before queuing it.

Thanks
Lai

>
> -       /* -ENOENT from try_to_grab_pending() becomes %true */
> +       local_irq_restore(irq_flags);
>         return ret;
>  }
>  EXPORT_SYMBOL_GPL(mod_delayed_work_on);