drm/amdgpu: replace readq/writeq with atomic64 operations

[Alex Deucher]

On Thu, Aug 8, 2019 at 3:31 PM Guenter Roeck <linux at roeck-us.net> wrote:
>
> On Wed, Aug 07, 2019 at 10:56:40AM +0800, Tao Zhou wrote:
> > readq/writeq are not supported on all architectures
> >
> > Signed-off-by: Tao Zhou <tao.zhou1 at amd.com>
> > Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
>
> Regarding the claim that this would work for 32-bit x86 builds:

I wasn't talking about readq/writeq, I was talking about the atomic64
interfaces.

Alex

>
> make ARCH=i386 allmodconfig
> make ARCH=i386 drivers/gpu/drm/amd/amdgpu/amdgpu_device.o
>
> results in:
>
>   ...
>   CC [M]  drivers/gpu/drm/amd/amdgpu/amdgpu_device.o
> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c: In function ‘amdgpu_mm_rreg64’:
> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:279:9: error: implicit declaration of function ‘readq’;
>
> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c: In function ‘amdgpu_mm_wreg64’:
> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c:298:3: error: implicit declaration of function ‘writeq’
>
> This is with next-20190808.
>
> Guenter
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