Hi Yangbo,

I love your patch! Yet something to improve:

[auto build test ERROR on 392c36e5be1dee19ffce8c8ba8f07f90f5aa3f7c]

url:    https://github.com/0day-ci/linux/commits/Yangbo-Lu/Support-ocelot-PTP-Sync-one-step-timestamping/20210416-203333
base:   392c36e5be1dee19ffce8c8ba8f07f90f5aa3f7c
config: i386-randconfig-r035-20210416 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/7e3d064908a2ecf6287c2eb40e0a36d86434f41c
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Yangbo-Lu/Support-ocelot-PTP-Sync-one-step-timestamping/20210416-203333
        git checkout 7e3d064908a2ecf6287c2eb40e0a36d86434f41c
        # save the attached .config to linux build tree
        make W=1 W=1 ARCH=i386 

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 >>, old ones prefixed by <<):

>> ERROR: modpost: "ocelot_ptp_rew_op" [net/dsa/tag_ocelot.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