[net-next:master 493/503] ERROR: "mtk_sgmii_init" [drivers/net/ethernet/mediatek/mtk_eth_soc.ko] undefined!

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git master
head:   b7034146756b9e91cc059b19df7fe4defd4d7de7
commit: 9ffee4a8276c734956b8eab19d1c9b0ecb6b79c5 [493/503] net: ethernet: mediatek: Extend SGMII related functions
config: arm-allmodconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 7.4.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 9ffee4a8276c734956b8eab19d1c9b0ecb6b79c5
        # save the attached .config to linux build tree
        GCC_VERSION=7.4.0 make.cross ARCH=arm 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <redacted>

All errors (new ones prefixed by >>):

   WARNING: modpost: missing MODULE_LICENSE() in drivers/net/ethernet/mediatek/mtk_sgmii.o
   see include/linux/module.h for more information

quoted

ERROR: "mtk_sgmii_init" [drivers/net/ethernet/mediatek/mtk_eth_soc.ko] undefined!

   ERROR: "mtk_sgmii_setup_mode_force" [drivers/net/ethernet/mediatek/mtk_eth_soc.ko] undefined!
   ERROR: "mtk_sgmii_setup_mode_an" [drivers/net/ethernet/mediatek/mtk_eth_soc.ko] undefined!

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