Hi Jiri,

I love your patch! Yet something to improve:

[auto build test ERROR on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Jiri-Pirko/net-introduce-alternative-names-for-network-interfaces/20190720-094639
config: arc-defconfig (attached as .config)
compiler: arc-elf-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
        # save the attached .config to linux build tree
        GCC_VERSION=7.4.0 make.cross ARCH=arc 

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

All errors (new ones prefixed by >>):

   {standard input}: Assembler messages:
   {standard input}:147: Error: inappropriate arguments for opcode 'st'

quoted

{standard input}:150: Error: Insn j_s has a jump/branch instruction j_s in its delay slot.

   {standard input}:175: Error: inappropriate arguments for opcode 'st'

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