linux-kernel - Re: [PATCH] cpufreq: create cooling device based on ACPI

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Date:   Fri, 28 Apr 2023 13:37:26 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     wangyouwan@....com
Cc:     rafael@...nel.org, viresh.kumar@...aro.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpufreq: create cooling device based on ACPI

On Fri, Apr 28, 2023 at 9:19 AM <wangyouwan@....com> wrote:
>
> From: youwan Wang <wangyouwan@....com>
>
> When using the "scpi_cpufreq" driver, an error
> occurs:cpufreq_cooling: OF node not available for cpu*.
> The current computer motherboard is using ACPI firmware.
> Go to see that the error is caused by calling the
> "of_cpufreq_cooling_register" interface.
> comment:create cpufreq cooling device based on DT.
>
> Signed-off-by: youwan Wang <wangyouwan@....com>
> ---
>  drivers/cpufreq/cpufreq.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
> index 6b52ebe5a890..3418c68959d5 100644
> --- a/drivers/cpufreq/cpufreq.c
> +++ b/drivers/cpufreq/cpufreq.c
> @@ -1528,8 +1528,13 @@ static int cpufreq_online(unsigned int cpu)
>         if (cpufreq_driver->ready)
>                 cpufreq_driver->ready(policy);
>
> -       if (cpufreq_thermal_control_enabled(cpufreq_driver))
> +       if (cpufreq_thermal_control_enabled(cpufreq_driver)) {
> +#ifdef CONFIG_ACPI
> +               policy->cdev = cpufreq_cooling_register(policy);
> +#else
>                 policy->cdev = of_cpufreq_cooling_register(policy);
> +#endif

Please avoid adding #ifdefs like this in random places.

Moreover, what if the kernel supports ACPI and the platform is DT-based?

> +       }
>
>         pr_debug("initialization complete\n");
>
> --