reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/zab/linux-rpdfs.git/commit/?id=e8e76da7ed715ef67ccc4436f4981a5b39983d9f
        git remote add zab-rpdfs https://git.kernel.org/pub/scm/linux/kernel/git/zab/linux-rpdfs.git
        git fetch --no-tags zab-rpdfs rpdfs-initial
        git checkout e8e76da7ed715ef67ccc4436f4981a5b39983d9f

        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=$HOME/0day COMPILER=gcc-15.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=mips olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-15.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash