reproduce (this is a W=1 build):
        # https://github.com/jpirko/linux_mlxsw/commit/a81126ff58172d1ce767b1e83109c9d408538b57
        git remote add jpirko-mlxsw https://github.com/jpirko/linux_mlxsw
        git fetch --no-tags jpirko-mlxsw wip_attestation_all_2
        git checkout a81126ff58172d1ce767b1e83109c9d408538b57
        # apt-get install llvm-dev

        # save the config file
        make W=1 ARCH=x86_64 olddefconfig
        make W=1 ARCH=x86_64 
        make W=1 headers_install
        make W=1 -C tools/testing/selftests