linux-kernel - Re: [PATCH 5/6] cpuidle: Remove call_cpuidle

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Message-ID: <CAJZ5v0h3O_q=Kjyp3X5-iAjAjPFBdRSZX4MJaqCGZmgRDHV9jg@mail.gmail.com>
Date: Tue, 14 Jan 2025 15:53:30 +0100
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>, 
	Daniel Lezcano <daniel.lezcano@...aro.org>, linux-pm@...r.kernel.org, 
	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, 
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH 5/6] cpuidle: Remove call_cpuidle_s2idle()

On Thu, Jan 2, 2025 at 4:02 PM Frederic Weisbecker <frederic@...nel.org> wrote:
>
> This middle call is unecessary, especially now that its counterpart

unnecessary (one 'n' is missing)

> call_cpuidle() has been removed.
>
> Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Signed-off-by: Frederic Weisbecker <frederic@...nel.org>

For the code change

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

> ---
>  kernel/sched/idle.c | 23 ++++++-----------------
>  1 file changed, 6 insertions(+), 17 deletions(-)
>
> diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
> index 9eece3df1080..86b902eb24fe 100644
> --- a/kernel/sched/idle.c
> +++ b/kernel/sched/idle.c
> @@ -126,19 +126,6 @@ void __cpuidle default_idle_call(void)
>         instrumentation_end();
>  }
>
> -static int call_cpuidle_s2idle(struct cpuidle_driver *drv,
> -                              struct cpuidle_device *dev)
> -{
> -       int ret;
> -
> -       if (current_clr_polling_and_test())
> -               return -EBUSY;
> -
> -       ret = cpuidle_enter_s2idle(drv, dev);
> -       __current_set_polling();
> -       return ret;
> -}
> -
>  /**
>   * cpuidle_idle_call - the main idle function
>   *
> @@ -184,10 +171,12 @@ static void cpuidle_idle_call(void)
>                 u64 max_latency_ns;
>
>                 if (idle_should_enter_s2idle()) {
> -
> -                       entered_state = call_cpuidle_s2idle(drv, dev);
> -                       if (entered_state > 0)
> -                               goto exit_idle;
> +                       if (!current_clr_polling_and_test()) {
> +                               entered_state = cpuidle_enter_s2idle(drv, dev);
> +                               __current_set_polling();
> +                               if (entered_state > 0)
> +                                       goto exit_idle;
> +                       }
>
>                         max_latency_ns = U64_MAX;
>                 } else {
> --
> 2.46.0
>