reproduce (this is a W=1 build):
        git remote add drm-misc https://gitlab.freedesktop.org/drm/misc/kernel.git
        git fetch --no-tags drm-misc drm-misc-next
        git checkout 99bda20d6d4cac30ed6d357658d8bc328c3b27d9

        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-15.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=m68k olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-15.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash drivers/gpu/drm/