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/conor/linux.git/commit/?id=f49c1fded333005467d9480d4cba62dfb8059501
        git remote add conor https://git.kernel.org/pub/scm/linux/kernel/git/conor/linux.git
        git fetch --no-tags conor pinctrl
        git checkout f49c1fded333005467d9480d4cba62dfb8059501
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=riscv olddefconfig
        ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash dtbs_check