[RFC PATCH v2 06/17] gpu: host1x: Cleanup and refcounting for syncpoints

[Dmitry Osipenko]

05.09.2020 17:53, Mikko Perttunen пишет:
...
>> Hello, Mikko!
>>
>> What do you think about to open-code all the host1x structs by moving
>> them all out into the public linux/host1x.h? Then we could inline all
>> these trivial single-line functions by having them defined in the public
>> header. This will avoid all the unnecessary overhead by allowing
>> compiler to optimize the code nicely.
>>
>> Of course this could be a separate change and it could be done sometime
>> later, I just wanted to share this quick thought for the start of the
>> review.
>>
> 
> Hi :)
> 
> I think for such micro-optimizations we should have a benchmark to
> evaluate against. I'm not sure we have all that many function calls into
> here overall that it would make a noticeable difference. In any case, as
> you said, I'd prefer to keep further refactoring to a separate series to
> avoid growing this series too much.

The performance difference doesn't bother me, it should be insignificant
in this particular case. The amount of the exported functions is what
makes me feel uncomfortable, and especially that most of those functions
are trivial.

My concern is that doing cleanups of the upstream drivers usually not
easy. Hence it could be a good thing to put effort into restructuring
the current code before new code is added. But at first we need to have
a full-featured draft implementation that will show what parts of the
driver require refactoring.