reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        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/20240911145836.734080-3-pierre-eric.pelloux-prayer@amd.com
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-18 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-18 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/accel/ drivers/gpu/drm/amd/amdgpu/ drivers/gpu/drm/xe/tests/