Hi Richard,

[FYI, it's a private test report for your RFC patch.]
[auto build test ERROR on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Richard-Cochran/Make-MAC-PHY-time-stamping-selectable/20220104-072717
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 3d694552fd8fe502e7ffd22ffa0e085bfd73b19a
config: nds32-defconfig (https://download.01.org/0day-ci/archive/20220104/202201041453.ofyk2zEq-lkp(a)intel.com/config)
compiler: nds32le-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
        # https://github.com/0day-ci/linux/commit/33070417b78b3844a2b2f55f94313072859da977
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Richard-Cochran/Make-MAC-PHY-time-stamping-selectable/20220104-072717
        git checkout 33070417b78b3844a2b2f55f94313072859da977
        # 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=nds32 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   nds32le-linux-ld: net/core/dev_ioctl.o: in function `dev_ifsioc':
>> dev_ioctl.c:(.text+0x4e0): undefined reference to `phy_do_ioctl'
>> nds32le-linux-ld: dev_ioctl.c:(.text+0x4e4): undefined reference to `phy_do_ioctl'
>> nds32le-linux-ld: dev_ioctl.c:(.text+0x576): undefined reference to `phy_mii_ioctl'
   nds32le-linux-ld: dev_ioctl.c:(.text+0x57a): undefined reference to `phy_mii_ioctl'

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org