reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://github.com/pdp7/linux/commit/7e756671a664b73b2a3c0cc37fd25abf6bcd851e
        git remote add pdp7 https://github.com/pdp7/linux
        git fetch --no-tags pdp7 thead-dt-for-next
        git checkout 7e756671a664b73b2a3c0cc37fd25abf6bcd851e
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-14.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=riscv olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-14.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash dtbs_check