[linux-next:master 1621/2336] ks8851_common.c:undefined reference to `mdiobus_alloc_size'

[kernel test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   1c925d2030afd354a02c23500386e620e662622b
commit: ef3631220d2b3d8d14cf64464760505baa60d6ac [1621/2336] net: ks8851: Register MDIO bus and the internal PHY
config: arm-efm32_defconfig (attached as .config)
compiler: arm-linux-gnueabi-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/next/linux-next.git/commit/?id=ef3631220d2b3d8d14cf64464760505baa60d6ac
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout ef3631220d2b3d8d14cf64464760505baa60d6ac
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 

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 >>):

   arm-linux-gnueabi-ld: drivers/net/ethernet/micrel/ks8851_common.o: in function `ks8851_probe_common':
>> ks8851_common.c:(.text+0xbf4): undefined reference to `mdiobus_alloc_size'
>> arm-linux-gnueabi-ld: ks8851_common.c:(.text+0xc30): undefined reference to `__mdiobus_register'
>> arm-linux-gnueabi-ld: ks8851_common.c:(.text+0xc3a): undefined reference to `mdiobus_free'
>> arm-linux-gnueabi-ld: ks8851_common.c:(.text+0xccc): undefined reference to `mdiobus_unregister'
   arm-linux-gnueabi-ld: drivers/net/ethernet/micrel/ks8851_common.o: in function `ks8851_remove_common':
>> ks8851_common.c:(.text+0xe82): undefined reference to `mdiobus_unregister'
   arm-linux-gnueabi-ld: ks8851_common.c:(.text+0xe8a): undefined reference to `mdiobus_free'

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

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