reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://git.kernel.org/pub/scm/linux/kernel/git/sven/linux.git/commit/?id=775cf79ad68f8662890ae7f18b28e8c97bf11e74
        git remote add sven https://git.kernel.org/pub/scm/linux/kernel/git/sven/linux.git
        git fetch --no-tags sven wip/atcphy
        git checkout 775cf79ad68f8662890ae7f18b28e8c97bf11e74
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arm64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash dtbs_check