[lunn:v5.7-rc1-next-next-cable-test 3/9] cabletest.c:undefined reference to `phy_start_cable_test'

[lunn:v5.7-rc1-next-next-cable-test 3/9] cabletest.c:undefined reference to `phy_start_cable_test'

[kbuild test robot]

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tree:   https://github.com/lunn/linux.git v5.7-rc1-next-next-cable-test
head:   bbe23801fda07213d22f2b5df8495c005fe45165
commit: 73c554bff4a7b3bb88f62217d9c1a8ff6e5c658f [3/9] net: ethtool: netlink: Add support for triggering a cable test
config: mips-malta_kvm_guest_defconfig (attached as .config)
compiler: mipsel-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 73c554bff4a7b3bb88f62217d9c1a8ff6e5c658f
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day GCC_VERSION=9.3.0 make.cross ARCH=mips 

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

All errors (new ones prefixed by >>):

   mipsel-linux-ld: net/ethtool/cabletest.o: in function `ethnl_act_cable_test':
>> cabletest.c:(.text+0xd4): undefined reference to `phy_start_cable_test'
   mipsel-linux-ld: cabletest.c:(.text+0x158): undefined reference to `phy_start_cable_test'

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

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