linux-kernel - Re: [PATCH] PM: remove PF_WQ

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Date:   Wed, 27 Jan 2021 19:16:21 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     qiang.zhang@...driver.com
Cc:     Rafael Wysocki <rafael.j.wysocki@...el.com>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PM: remove PF_WQ_WORKER mask

On Mon, Jan 25, 2021 at 5:01 AM <qiang.zhang@...driver.com> wrote:
>
> From: Zqiang <qiang.zhang@...driver.com>
>
> Due to kworker also is kernel thread, it's already included
> PF_KTHREAD mask, so remove PF_WQ_WORKER mask.

So you are saying that all threads having PF_WQ_WORKER set must also
have PF_KTHREAD set, right?

That sounds correct, so I'm going to rewrite the changelog and apply
the patch as 5.12 material, thanks!

> Signed-off-by: Zqiang <qiang.zhang@...driver.com>
> ---
>  kernel/power/process.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kernel/power/process.c b/kernel/power/process.c
> index 45b054b7b5ec..50cc63534486 100644
> --- a/kernel/power/process.c
> +++ b/kernel/power/process.c
> @@ -235,7 +235,7 @@ void thaw_kernel_threads(void)
>
>         read_lock(&tasklist_lock);
>         for_each_process_thread(g, p) {
> -               if (p->flags & (PF_KTHREAD | PF_WQ_WORKER))
> +               if (p->flags & PF_KTHREAD)
>                         __thaw_task(p);
>         }
>         read_unlock(&tasklist_lock);
> --
> 2.17.1
>