reproduce (this is a W=1 build):
        # https://github.com/jpirko/linux_mlxsw/commit/a9594ca8b4dea6c838edd404e1c6cc8f58993015
        git remote add jpirko-mlxsw https://github.com/jpirko/linux_mlxsw
        git fetch --no-tags jpirko-mlxsw xdp
        git checkout a9594ca8b4dea6c838edd404e1c6cc8f58993015

        # install um cross compiling tool for clang build
        # apt-get install binutils-um-linux-gnu
        # clang-22 might not be officially released. Try a lower version if installation fails.
        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=$HOME/0day COMPILER=clang-22 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=um olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-22 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=um SHELL=/bin/bash drivers/net/ethernet/intel/ice/ drivers/net/ethernet/intel/libeth/