tree: git://git.armlinux.org.uk/~rmk/linux-arm.git zii head: d3ebd79d7fb6476e2409c147e4dcc304733f7ae6 commit: 4a3afb218aacb819703cf3336e5c7c83b41b10fb [111/186] net: macb: use .mac_select_pcs() interface config: microblaze-randconfig-r013-20211214 (https://download.01.org/0day-ci/archive/20211215/202112151024.Zg0UOSvY-lk...) compiler: microblaze-linux-gcc (GCC) 11.2.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git remote add arm git://git.armlinux.org.uk/~rmk/linux-arm.git git fetch --no-tags arm zii git checkout 4a3afb218aacb819703cf3336e5c7c83b41b10fb # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=microblaze SHELL=/bin/bash drivers/net/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): drivers/net/ethernet/cadence/macb_main.c: In function 'macb_mac_select_pcs': 736 | return bp->phylink_sgmii_pcs; | ~~^~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/cadence/macb_main.c:739:1: error: control reaches end of non-void function [-Werror=return-type] 739 | } | ^ cc1: some warnings being treated as errors vim +736 drivers/net/ethernet/cadence/macb_main.c 726 727 static struct phylink_pcs *macb_mac_select_pcs(struct phylink_config *config, 728 phy_interface_t interface) 729 { 730 struct net_device *ndev = to_net_dev(config->dev); 731 struct macb *bp = netdev_priv(ndev); 732 733 if (interface == PHY_INTERFACE_MODE_10GBASER) 734 return &bp->phylink_usx_pcs; 735 else if (interface == PHY_INTERFACE_MODE_SGMII) 737 else 738 return NULL; 739 } 740 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org