Hi Jeremy,

I love your patch! Yet something to improve:

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

url:    https://github.com/0day-ci/linux/commits/Jeremy-Kerr/MCTP-kunit-tests/20211001-162019
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git b05173028cc52384be42dcf81abdb4133caccfa5
config: arm-randconfig-r006-20211001 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 962e503cc8bc411f7523cc393acae8aae425b1c4)
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
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/0day-ci/linux/commit/85da939dab5470b1f2a921867d780af5a1fd8aab
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Jeremy-Kerr/MCTP-kunit-tests/20211001-162019
        git checkout 85da939dab5470b1f2a921867d780af5a1fd8aab
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash

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 >>):

>> ld.lld: error: undefined symbol: mctp_test_create_dev
   >>> referenced by route.c
   >>> mctp/route.o:(mctp_test_rx_input) in archive net/built-in.a
--
>> ld.lld: error: undefined symbol: mctp_test_destroy_dev
   >>> referenced by route.c
   >>> mctp/route.o:(mctp_test_rx_input) in archive net/built-in.a

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