linux-kernel - Re: [PATCH v2 1/2] thermal/core: Make the userspace governor deprecated

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Date:   Tue, 19 Oct 2021 17:37:40 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Lukasz Luba <lukasz.luba@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Amit Kucheria <amitk@...nel.org>
Subject: Re: [PATCH v2 1/2] thermal/core: Make the userspace governor deprecated

On Tue, Oct 19, 2021 at 5:02 PM Daniel Lezcano
<daniel.lezcano@...aro.org> wrote:
>
> The userspace governor is sending temperature when polling is active
> and trip point crossed events. Nothing else.
>
> AFAICT, this governor is used with custom kernels making the userspace
> governor co-existing with another governor on the same thermal zone
> because there was no notification mechanism, implying a hack in the
> framework to support this configuration.
>
> The new netlink thermal notification is able to provide more
> information than the userspace governor and give the opportunity to
> the users of this governor to replace it by a dedicated notification
> framework.
>
> The userspace governor will be removed as its usage is no longer
> needed.
>
> Add a warning message to tell the userspace governor is deprecated.
>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>

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

> ---
>  drivers/thermal/gov_user_space.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
>
> diff --git a/drivers/thermal/gov_user_space.c b/drivers/thermal/gov_user_space.c
> index 82a7198bbe71..f4fe050e1cbc 100644
> --- a/drivers/thermal/gov_user_space.c
> +++ b/drivers/thermal/gov_user_space.c
> @@ -15,6 +15,14 @@
>
>  #include "thermal_core.h"
>
> +static int user_space_bind(struct thermal_zone_device *tz)
> +{
> +       pr_warn("Userspace governor deprecated: use thermal netlink "   \
> +               "notification instead\n");
> +
> +       return 0;
> +}
> +
>  /**
>   * notify_user_space - Notifies user space about thermal events
>   * @tz: thermal_zone_device
> @@ -43,5 +51,6 @@ static int notify_user_space(struct thermal_zone_device *tz, int trip)
>  static struct thermal_governor thermal_gov_user_space = {
>         .name           = "user_space",
>         .throttle       = notify_user_space,
> +       .bind_to_tz     = user_space_bind,
>  };
>  THERMAL_GOVERNOR_DECLARE(thermal_gov_user_space);
> --
> 2.25.1
>