linux-kernel - Re: [PATCH v3 1/2] thermal/core: Make the userspace governor deprecated

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Date:   Wed, 20 Oct 2021 12:47:45 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     lukasz.luba@....com
Cc:     rjw@...ysocki.net, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Zhang Rui <rui.zhang@...el.com>,
        Amit Kucheria <amitk@...nel.org>
Subject: Re: [PATCH v3 1/2] thermal/core: Make the userspace governor
 deprecated


Hi Lukasz,

Do you agree with these changes ?

On 19/10/2021 18:35, Daniel Lezcano 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);
> 


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