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From: "Rafael J. Wysocki" <rafael@kernel.org>
To: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Viresh Kumar <viresh.kumar@linaro.org>,
	Eduardo Valentin <edubezval@gmail.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	"open list:CPU FREQUENCY SCALING FRAMEWORK" 
	<linux-pm@vger.kernel.org>
Subject: Re: [PATCH 1/6] cpufreq: Use existing stub functions instead of IS_ENABLED macro
Date: Sat, 22 Jun 2019 11:12:46 +0200
Message-ID: <CAJZ5v0j0q+Z+FRpVuj39ML_c5ijo-veMMMSANdoDz1ZxAK3RgQ@mail.gmail.com> (raw)
In-Reply-To: <20190621132302.30414-1-daniel.lezcano@linaro.org>

On Fri, Jun 21, 2019 at 3:23 PM Daniel Lezcano
<daniel.lezcano@linaro.org> wrote:
>
> The functions stub already exist for the condition the IS_ENABLED
> is trying to avoid.
>
> Remove the IS_ENABLED macros as they are pointless.

AFAICS, the IS_ENABLED checks are an optimization to avoid generating
pointless code (including a branch) in case CONFIG_CPU_THERMAL is not
set.

Why do you think that it is not useful?

> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
> ---
>  drivers/cpufreq/cpufreq.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
> index 85ff958e01f1..7c72f7d3509c 100644
> --- a/drivers/cpufreq/cpufreq.c
> +++ b/drivers/cpufreq/cpufreq.c
> @@ -1378,8 +1378,7 @@ static int cpufreq_online(unsigned int cpu)
>         if (cpufreq_driver->ready)
>                 cpufreq_driver->ready(policy);
>
> -       if (IS_ENABLED(CONFIG_CPU_THERMAL) &&
> -           cpufreq_driver->flags & CPUFREQ_IS_COOLING_DEV)
> +       if (cpufreq_driver->flags & CPUFREQ_IS_COOLING_DEV)
>                 policy->cdev = of_cpufreq_cooling_register(policy);
>
>         pr_debug("initialization complete\n");
> @@ -1469,8 +1468,7 @@ static int cpufreq_offline(unsigned int cpu)
>                 goto unlock;
>         }
>
> -       if (IS_ENABLED(CONFIG_CPU_THERMAL) &&
> -           cpufreq_driver->flags & CPUFREQ_IS_COOLING_DEV) {
> +       if (cpufreq_driver->flags & CPUFREQ_IS_COOLING_DEV) {
>                 cpufreq_cooling_unregister(policy->cdev);
>                 policy->cdev = NULL;
>         }
> --
> 2.17.1
>

  parent reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-21 13:22 Daniel Lezcano
2019-06-21 13:22 ` [PATCH 2/6] thermal/drivers/cpu_cooling: Unregister with the policy Daniel Lezcano
2019-06-24  6:03   ` Viresh Kumar
2019-06-24  7:30     ` Daniel Lezcano
2019-06-24  7:37       ` Viresh Kumar
2019-06-24  7:45         ` Daniel Lezcano
2019-06-24  9:39           ` Viresh Kumar
2019-06-21 13:22 ` [PATCH 3/6] cpufreq/drivers/arm_big_little: Remove cooling device usage Daniel Lezcano
2019-06-24  6:04   ` Viresh Kumar
2019-06-21 13:23 ` [PATCH 4/6] cpufreq: " Daniel Lezcano
2019-06-24  6:05   ` Viresh Kumar
2019-06-21 13:23 ` [PATCH 5/6] thermal/drivers/imx: " Daniel Lezcano
2019-06-24  6:06   ` Viresh Kumar
2019-06-21 13:23 ` [PATCH 6/6] thermal/drivers/ti: " Daniel Lezcano
2019-06-24  6:06   ` Viresh Kumar
2019-06-22  9:12 ` Rafael J. Wysocki [this message]
2019-06-24  9:22   ` [PATCH 1/6] cpufreq: Use existing stub functions instead of IS_ENABLED macro Daniel Lezcano
2019-06-24  9:30     ` Rafael J. Wysocki
2019-06-24  9:37       ` Daniel Lezcano
2019-06-24  8:53 ` Daniel Lezcano
2019-06-24  9:00   ` Rafael J. Wysocki
2019-06-24  9:07     ` Daniel Lezcano
2019-06-24  9:08   ` Viresh Kumar

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