reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/fustini/linux.git/commit/?id=bfd6a2f1cb6b4fd665530e33c5452f95040e86e6
        git remote add fustini https://git.kernel.org/pub/scm/linux/kernel/git/fustini/linux.git
        git fetch --no-tags fustini b4/ssqosid-cbqri-rqsc
        git checkout bfd6a2f1cb6b4fd665530e33c5452f95040e86e6

        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