reproduce (this is a W=1 build):
        git remote add drm-exynos https://git.kernel.org/pub/scm/linux/kernel/git/daeinki/drm-exynos.git
        git fetch drm-exynos exynos-drm-next
        git checkout drm-exynos/exynos-drm-next
        b4 shazam https://lore.kernel.org/r/20251026173944.219373-1-tzimmermann@suse.de

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/gpu/drm/gma500/ drivers/gpu/drm/radeon/