reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://github.com/norov/linux/commit/a56fd4e0a4b6111bffdf5ece29e9ff46d4ae654d
        git remote add norov https://github.com/norov/linux
        git fetch --no-tags norov fnb
        git checkout a56fd4e0a4b6111bffdf5ece29e9ff46d4ae654d
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-15.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=s390 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-15.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash drivers/net/ethernet/mellanox/mlxsw/