Hi yankejian,

[auto build test ERROR on pm/linux-next]
[also build test ERROR on v4.4-rc3 next-20151202]

url:    https://github.com/0day-ci/linux/commits/yankejian/ACPI-Add-phylib-support-code-for-mdio/20151203-115039
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
config: i386-randconfig-i0-201548 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `acpi_mdiobus_register_phy':
>> acpi_mdio.c:(.text+0x2de27): undefined reference to `get_phy_device'
>> acpi_mdio.c:(.text+0x2de84): undefined reference to `phy_device_register'
>> acpi_mdio.c:(.text+0x2de8f): undefined reference to `phy_device_free'
   drivers/built-in.o: In function `acpi_phy_find_device':
>> (.text+0x2dee4): undefined reference to `mdio_bus_type'
   drivers/built-in.o: In function `acpi_phy_attach':
>> (.text+0x2df25): undefined reference to `phy_attach_direct'
   drivers/built-in.o: In function `acpi_phy_connect':
>> (.text+0x2df71): undefined reference to `phy_connect_direct'
   drivers/built-in.o: In function `acpi_mdiobus_register':
>> (.text+0x2e01a): undefined reference to `__mdiobus_register'

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