reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://github.com/gdamjan/linux/commit/b664444682ddf441ec365d42b365860d7a371727
        git remote add gdamjan https://github.com/gdamjan/linux
        git fetch --no-tags gdamjan v6.17/thinkpad-x9-14
        git checkout b664444682ddf441ec365d42b365860d7a371727
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=riscv olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash