linux-kernel - Re: [PATCH 07/10] cpuidle: Remove unnecessary current_clr_polling() on poll

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Message-ID: <CAJZ5v0hwXuYDyJ4FxK_svbDemiN_CUjJ5SF5G9b8grKBQV8R7Q@mail.gmail.com>
Date:   Fri, 11 Aug 2023 19:40:14 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Anna-Maria Behnsen <anna-maria@...utronix.de>
Subject: Re: [PATCH 07/10] cpuidle: Remove unnecessary current_clr_polling()
 on poll_idle()

On Fri, Aug 11, 2023 at 7:01 PM Frederic Weisbecker <frederic@...nel.org> wrote:
>
> There is no point in clearing TIF_NR_POLLING and folding TIF_NEED_RESCHED
> upon poll_idle() exit because cpuidle_idle_call() is going to set again
> TIF_NR_POLLING anyway. Also if TIF_NEED_RESCHED is set, it will be
> folded and TIF_NR_POLLING will be cleared at the end of do_idle().
>
> Signed-off-by: Frederic Weisbecker <frederic@...nel.org>

Acked-by: Rafael J. Wysocki <rafael@...nel.org>

> ---
>  drivers/cpuidle/poll_state.c | 2 --
>  1 file changed, 2 deletions(-)
>
> diff --git a/drivers/cpuidle/poll_state.c b/drivers/cpuidle/poll_state.c
> index 009f46f121ae..44a656464d06 100644
> --- a/drivers/cpuidle/poll_state.c
> +++ b/drivers/cpuidle/poll_state.c
> @@ -48,8 +48,6 @@ static int __cpuidle poll_idle(struct cpuidle_device *dev,
>         }
>         raw_local_irq_disable();
>
> -       current_clr_polling();
> -
>         return index;
>  }
>
> --
> 2.34.1
>