tree: https://git.kernel.org/pub/scm/linux/kernel/git/kabel/linux.git marvell10g-updates head: 8a3b1f3480e7689d1f5f1c64296df9a043bb42ef commit: f814fbd474f09b414651c82fb765e644595067b1 [17/37] net: mdiobus: add support to access PHY registers via debugfs config: m68k-allmodconfig (attached as .config) compiler: m68k-linux-gcc (GCC) 9.3.0 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 # https://git.kernel.org/pub/scm/linux/kernel/git/kabel/linux.git/commit/?i... git remote add kabel https://git.kernel.org/pub/scm/linux/kernel/git/kabel/linux.git git fetch --no-tags kabel marvell10g-updates git checkout f814fbd474f09b414651c82fb765e644595067b1 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=m68k If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>): 43 | int mdiobus_register_debugfs(struct mii_bus *bus) | ^~~~~~~~~~~~~~~~~~~~~~~~ 65 | void mdiobus_unregister_debugfs(struct mii_bus *bus) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ 76 | int mdiobus_debugfs_init(void) | ^~~~~~~~~~~~~~~~~~~~ 89 | void mdiobus_debugfs_exit(void) | ^~~~~~~~~~~~~~~~~~~~ -- m68k-linux-ld: drivers/net/phy/mdio_debugfs.o: in function `val_set': m68k-linux-ld: drivers/net/phy/mdio_debugfs.o: in function `val_get': --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org