reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/6487dda010cebf1838d44e9ef59cdf8dbcf6a47d
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Kyle-Switch/net-dsa-motorcomm-initialize-dsa_switch-based-on-chipid/20260929-105407
        git checkout 6487dda010cebf1838d44e9ef59cdf8dbcf6a47d

        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=$HOME/0day COMPILER=gcc-11.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=s390 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash drivers/net/dsa/motorcomm/