[Nouveau] [PATCH nouveau 09/11] drm: export some variable and functions to resue the PM functions

[Alexandre Courbot]

On Mon, Jan 5, 2015 at 4:32 PM, Thierry Reding <thierry.reding at gmail.com> wrote:
> On Tue, Dec 30, 2014 at 11:18:34AM +0800, Vince Hsu wrote:
>> Hi Emil,
>>
>> On 12/30/2014 10:34 AM, Emil Velikov wrote:
>> >On 23/12/14 10:40, Vince Hsu wrote:
>> >>This patch adds some checks in the suspend/resume functions to distinguish
>> >>the dGPU and mobile GPU and exports some variables/functions so that the
>> >>nouveau platform device can reuse them.
>> >>
>> >Hi Vince,
>> >
>> >Afaiu one needs to export a symbol as it's used by another module or
>> >subsystem. With the follow up two patches you are not doing either one,
>> >so I'd assume that you can just omit the EXPORT_* changes.
>> The nouveau platform device driver is built as another module -
>> nouveau_platform.ko. :)
>
> I'd like to hear the opinion of the nouveau people and Alex, but I'd
> very much prefer if nouveau_platform.o was simply linked into the
> nouveau.ko module. I don't see any good reason to keep it separate.

Yep, I agree. The decision to host platform support in a separate
module looks misleaded if it results in additional exports that we
would otherwise avoid. IIUC I did this to be able to use the module
convenience macros to register the platform driver.

>
> Something like the attached patch (untested) ought to do it.

This patch alone won't be enough for the reason I mentioned above.
However, if Vince doesn't mind handling the platform driver
registration manually in nouveau_drm_init/nouveau_drm_exit, I agree
this would be the way to go.

Cheers,
Alex.