Re: [PATCH] drm/pl111: add ARM_AMBA dependency

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Arnd Bergmann <arnd@xxxxxxxx> writes:

> The driver is written in a way to enable compile-testing without CONFIG_ARM_AMBA,
> but it just causes needless warnings:
>
> drivers/gpu/drm/pl111/pl111_drv.c:149:26: error: 'pl111_drm_driver' defined but not used [-Werror=unused-variable]
> drivers/gpu/drm/pl111/pl111_drv.c:81:12: error: 'pl111_modeset_init' defined but not used [-Werror=unused-function]
>
> This removes the #ifdef instead, and adds a dependency on ARM_AMBA to
> only let us build the driver when the base support is enabled.
>
> Unfortunately, this requires removing one redundant 'select ARM_AMBA'
> line from mach-s3c64xx to avoid a circular dependency.
>
> It might be good to allow manually enabling ARM_AMBA when COMPILE_TEST
> is turned on, but that should be a separate patch and may cause other
> build regressions.

If I understand the Kconfig, you're effectively disabling the build on
COMPILE_TEST && !ARM.  I'd rather that we just fix up the warnings, so
that people can keep build-testing DRM drivers:

https://patchwork.kernel.org/patch/9737857/

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