reproduce (this is a W=1 build):
        # https://github.com/brauner/linux/commit/a3e03deb81d0002a55fee3cefd1a39dac1453640
        git remote add brauner-github https://github.com/brauner/linux.git
        git fetch --no-tags brauner-github namespace-6.19
        git checkout a3e03deb81d0002a55fee3cefd1a39dac1453640

        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=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=riscv olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash kernel/