Hi Oleksij,

I love your patch! Yet something to improve:

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

url:    https://github.com/0day-ci/linux/commits/Oleksij-Rempel/provide-generic-net-selftest-support/20210415-211011
base:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 3a1aa533f7f676aad68f8dbbbba10b9502903770
config: microblaze-randconfig-r023-20210415 (attached as .config)
compiler: microblaze-linux-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/588de0d11c3a08c5d379652b1a8c69ecf99769f9
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Oleksij-Rempel/provide-generic-net-selftest-support/20210415-211011
        git checkout 588de0d11c3a08c5d379652b1a8c69ecf99769f9
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=microblaze 

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

All errors (new ones prefixed by >>, old ones prefixed by <<):

quoted

ERROR: modpost: "net_selftest_get_count" [net/dsa/dsa_core.ko] undefined!
ERROR: modpost: "net_selftest" [net/dsa/dsa_core.ko] undefined!
ERROR: modpost: "net_selftest_get_strings" [net/dsa/dsa_core.ko] undefined!

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