Hi Mathieu,

Thank you for the patch! Yet something to improve:

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

url:    https://github.com/0day-ci/linux/commits/Mathieu-Xhonneux/ipv6-sr-introduce-seg6local-End-BPF-action/20180506-233046
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: s390-allmodconfig (attached as .config)
compiler: s390x-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
        make.cross ARCH=s390 

All errors (new ones prefixed by >>):

   net/core/filter.o: In function `bpf_push_seg6_encap':
   filter.c:(.text+0xaf4c): undefined reference to `seg6_validate_srh'
   filter.c:(.text+0xaf8a): undefined reference to `seg6_do_srh_inline'
   filter.c:(.text+0xafc4): undefined reference to `seg6_do_srh_encap'
   filter.c:(.text+0xb016): undefined reference to `seg6_lookup_nexthop'
   net/core/filter.o: In function `bpf_lwt_seg6_store_bytes':
>> (.text+0xb106): undefined reference to `seg6_bpf_srh_states'
   net/core/filter.o: In function `bpf_lwt_seg6_action':
   (.text+0xb2b0): undefined reference to `seg6_bpf_srh_states'
>> (.text+0xb334): undefined reference to `seg6_validate_srh'
>> (.text+0xb394): undefined reference to `seg6_lookup_nexthop'
   (.text+0xb3c4): undefined reference to `seg6_lookup_nexthop'
   net/core/filter.o: In function `bpf_lwt_seg6_adjust_srh':
   (.text+0xb492): undefined reference to `seg6_bpf_srh_states'

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