Hi Xin,

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/Xin-Long/sctp-Implement-RFC6951-UDP-Encapsulation-of-SCTP/20201008-175211
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 9faebeb2d80065926dfbc09cb73b1bb7779a89cd
config: arm-keystone_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/60851a8f9ae9fd55f1199581dd78f6030bed63c7
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Xin-Long/sctp-Implement-RFC6951-UDP-Encapsulation-of-SCTP/20201008-175211
        git checkout 60851a8f9ae9fd55f1199581dd78f6030bed63c7
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 

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

All errors (new ones prefixed by >>):

   arm-linux-gnueabi-ld: net/sctp/protocol.o: in function `sctp_udp_sock_start':
   protocol.c:(.text+0x108c): undefined reference to `udp_sock_create4'
   arm-linux-gnueabi-ld: protocol.c:(.text+0x10b8): undefined reference to `setup_udp_tunnel_sock'
>> arm-linux-gnueabi-ld: protocol.c:(.text+0x111c): undefined reference to `udp_sock_create6'
   arm-linux-gnueabi-ld: protocol.c:(.text+0x113c): undefined reference to `setup_udp_tunnel_sock'
>> arm-linux-gnueabi-ld: protocol.c:(.text+0x1180): undefined reference to `udp_tunnel_sock_release'
   arm-linux-gnueabi-ld: net/sctp/protocol.o: in function `sctp_udp_sock_stop':
   protocol.c:(.text+0x11b4): undefined reference to `udp_tunnel_sock_release'
   arm-linux-gnueabi-ld: protocol.c:(.text+0x11d0): undefined reference to `udp_tunnel_sock_release'

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0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org