reproduce (this is a W=1 build):
        # https://github.com/norov/linux/commit/9c19f38601eb29dfc08c3db08940f467f48b1d79
        git remote add norov https://github.com/norov/linux
        git fetch --no-tags norov new_tests
        git checkout 9c19f38601eb29dfc08c3db08940f467f48b1d79

        # install sparc64 cross compiling tool for clang build
        # apt-get install binutils-sparc64-linux-gnu
        # clang-23 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=$HOME/0day COMPILER=clang-23 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=sparc64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-23 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=sparc64 SHELL=/bin/bash drivers/net/ethernet/mellanox/mlx4/ drivers/net/ethernet/mellanox/mlx5/core/