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

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Message-ID: <942b9998-9858-7776-97b7-b5ac1c637a2e@arm.com>
Date:   Thu, 21 Oct 2021 16:30:28 +0100
From:   Lukasz Luba <lukasz.luba@....com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
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 Daniel,


On 10/20/21 11:47 AM, Daniel Lezcano wrote:
> 
> Hi Lukasz,
> 
> Do you agree with these changes ?

Yes, I 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);
>>
> 
> 


You can add:

Reviewed-by: Lukasz Luba <lukasz.luba@....com>

Regards,
Lukasz