linux-kernel - Re: [PATCH v3 05/12] thermal/core: Remove unneeded EXPORT

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Date:   Tue, 5 Jul 2022 08:30:26 +0100
From:   Lukasz Luba <lukasz.luba@....com>
To:     daniel.lezcano@...aro.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        khilman@...libre.com, abailon@...libre.com,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>, Todd Kjos <tkjos@...gle.com>,
        Wei Wang <wvw@...gle.com>, rafael@...nel.org,
        Daniel Lezcano <daniel.lezcano@...exp.org>
Subject: Re: [PATCH v3 05/12] thermal/core: Remove unneeded EXPORT_SYMBOLS



On 7/4/22 22:14, Daniel Lezcano wrote:
> On 04/07/2022 09:35, Lukasz Luba wrote:
>> Hi Daniel,
>>
>> (+Todd and Wei on CC)
>>
>>
>> On 7/3/22 19:30, Daniel Lezcano wrote:
> 
> [ ... ]
> 
>>>   }
>>> -EXPORT_SYMBOL(get_tz_trend);
> 
> [ ... ]
> 
>>>   }
>>> -EXPORT_SYMBOL(thermal_cdev_update);
>>
>> I wouldn't remove that export. I can see in my Pixel6 modules dir, that
>> it's called in 7 places.
>>
>> I assume that in Android world this is common use.
> 
> It is not possible to do changes taking into consideration out of tree 
> code. Moreover there is logically no good reason to use the 
> thermal_cdev_update() function from outside of the thermal core code.
> 

I see your point which is 'upstream'. On the other hand the mostly
deployed kernel is in Android devices and that brings a lot to the
community.

This symbol might also be used by other distros which might have
modules for some accelerators, which also support tricky cooling.

I would keep it as is...