Hi Tom,

Thank you for the patch! Yet something to improve:

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

url:    https://github.com/0day-ci/linux/commits/Tom-Herbert/exthdrs-Make-ext-headers-options-useful-Part-I/20190419-170926
config: mips-allmodconfig (attached as .config)
compiler: mips-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
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=7.2.0 make.cross ARCH=mips 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>


All errors (new ones prefixed by >>):

   net/ipv6/exthdrs_options.o: In function `ipv6_exthdrs_init':
>> exthdrs_options.c:(.init.text+0x0): multiple definition of `init_module'
   net/ipv6/af_inet6.o:af_inet6.c:(.init.text+0x0): first defined here

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