tree: https://github.com/lunn/linux.git v5.7-rc4-net-next-cable-test-tdr head: 53c1ec2fa62252d289cd0e9fa711c2f49a3ecf71 commit: cef86bd8dfcd394e8882e4005f8cd3244e775b14 [3/7] net: ethtool: Add helpers for cable test TDR data config: openrisc-randconfig-r026-20200513 (attached as .config) compiler: or1k-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout cef86bd8dfcd394e8882e4005f8cd3244e775b14 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day GCC_VERSION=9.3.0 make.cross ARCH=openrisc If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from net/ethtool/ioctl.c:29: 64 | { | ^ include/linux/ethtool_netlink.h:62:19: warning: 'ethnl_cable_test_step' declared 'static' but never defined [-Wunused-function] 62 | static inline int ethnl_cable_test_step(struct phy_device *phydev, u32 first, | ^~~~~~~~~~~~~~~~~~~~~ vim +64 include/linux/ethtool_netlink.h 57 58 static inline int ethnl_cable_test_pulse(struct phy_device *phydev, u16 mV) 59 { 60 return -EOPNOTSUPP; 61 } 62 static inline int ethnl_cable_test_step(struct phy_device *phydev, u32 first, 63 u32 last, u32 step); --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org