reproduce (this is a W=1 build):
        # https://github.com/jpirko/linux_mlxsw/commit/dc0295622a8904261675fbf1b38f435c7db9296d
        git remote add jpirko-mlxsw https://github.com/jpirko/linux_mlxsw
        git fetch --no-tags jpirko-mlxsw wip_dl_pfs_parent
        git checkout dc0295622a8904261675fbf1b38f435c7db9296d
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash net/devlink/