[mmotm:master 283/296] undefined reference to `fixed_phy_unregister'

[kbuild test robot <fengguang.wu@xxxxxxxxx>]

Hi,

It's probably a bug fix that unveils the link errors.

tree:   git://git.cmpxchg.org/linux-mmotm.git master
head:   d7dfee4d42013afabf86c7e1f5fe205bc0bc8f79
commit: e3c4a513bc6deea19ea34c2a74598bb94593bed2 [283/296] linux-next-git-rejects
config: x86_64-randconfig-i0-201626 (attached as .config)
compiler: gcc-6 (Debian 6.1.1-1) 6.1.1 20160430
reproduce:
        git checkout e3c4a513bc6deea19ea34c2a74598bb94593bed2
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `of_phy_register_fixed_link':
   (.text+0x9bc8f4): undefined reference to `fixed_phy_register'
   drivers/built-in.o: In function `of_phy_register_fixed_link':
   (.text+0x9bc92c): undefined reference to `fixed_phy_register'
   drivers/built-in.o: In function `of_phy_register_fixed_link':
   (.text+0x9bca38): undefined reference to `fixed_phy_register'
   net/built-in.o: In function `dsa_cpu_dsa_destroy':
>> (.text+0x2f43e0): undefined reference to `fixed_phy_unregister'
   net/built-in.o: In function `dsa_slave_create':
>> (.text+0x2fa828): undefined reference to `fixed_phy_set_link_update'

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