Arnd Bergmann <arnd@xxxxxxxx> writes: > On Mon, May 22, 2017 at 6:23 PM, Eric Anholt <eric@xxxxxxxxxx> wrote: >> 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/ > > That works too. When I tried the same, I thought it was a little too silly to > have a file that effectively compiles into nothing. > > My initial approach did two things differently though: > > - use __maybe_unused instead of __used, since > > - annotate pl111_amba_driver instead of > pl111_drm_driver/pl111_modeset_init, and keep only > module_amba_driver() in the #ifdef. Oh, yeah, we've eliminated the amba_request_regions() that used to be why the probe had to be under the #ifdef, so your solution would get us better coverage and simpler code. If you could send that patch to dri-devel today, I'll get it applied.
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