linux-kernel - Re: [PATCH] thermal: hisilicon: Don't enable by default

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Date:   Tue, 17 Mar 2020 21:05:33 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Lubomir Rintel <lkundrak@...sk>
Cc:     Zhang Rui <rui.zhang@...el.com>,
        Amit Kucheria <amit.kucheria@...durent.com>,
        kongxinwei <kong.kongxinwei@...ilicon.com>,
        Wangtao <kevin.wangtao@...ilicon.com>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] thermal: hisilicon: Don't enable by default

On 17/03/2020 20:27, Lubomir Rintel wrote:
> On Tue, Mar 17, 2020 at 06:45:29PM +0100, Daniel Lezcano wrote:
>> On 17/03/2020 18:41, Lubomir Rintel wrote:
>>> Users are generally unlikely to have a HiSilicon thermal sensor.
>>
>> Why ?
> 
> Because most computers don't run on HiSilicon chips.
> 
>> The thermal sensor is needed for the thermal mitigation.
> 
> If it's really needed, shouldn't ARCH_HISI depend on it?
> 
> In any case, I submitted this, because the driver enabled itself when I
> turned on COMPILE_TEST, which was entirely unexpected.

The COMPILE_TEST option's contextual help says:

"If you are a developer and want to build everything available, say Y
       here."

> Unless I'm
> mistaken, defaulting to off seems to be a standard practice for most
> drivers, including thermal.

The COMPILE_TEST option is there in order to increase the compilation
test coverage (for example compile the drivers on a powerful x86 machine
with different option combinations).

> Would this be a better idea?
> 
>   default y if ARCH_HISI
> 
> Thanks
> Lubo
> 
>>
>>> Like most other thermal drivers, don't build it by default/
>>>
>>> Signed-off-by: Lubomir Rintel <lkundrak@...sk>
>>> ---
>>>  drivers/thermal/Kconfig | 1 -
>>>  1 file changed, 1 deletion(-)
>>>
>>> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
>>> index 02c3aa322a4a6..2062f8ec272b6 100644
>>> --- a/drivers/thermal/Kconfig
>>> +++ b/drivers/thermal/Kconfig
>>> @@ -233,7 +233,6 @@ config HISI_THERMAL
>>>  	depends on ARCH_HISI || COMPILE_TEST
>>>  	depends on HAS_IOMEM
>>>  	depends on OF
>>> -	default y
>>>  	help
>>>  	  Enable this to plug hisilicon's thermal sensor driver into the Linux
>>>  	  thermal framework. cpufreq is used as the cooling device to throttle
>>>
>>
>>
>> -- 
>>  <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs
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