Hi Andy, I love your patch! Yet something to improve: [auto build test ERROR on net-next/master] url: https://github.com/0day-ci/linux/commits/Andy-Shevchenko/ptp_pch-use-mac_... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git b769cf44ed55f4b277b89cf53df6092f0c9082d0 config: parisc-allyesconfig (attached as .config) compiler: hppa-linux-gcc (GCC) 11.2.0 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/c854fdc883f2a8f074021cbae3becb5a9... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Andy-Shevchenko/ptp_pch-use-mac_pton/20210813-203135 git checkout c854fdc883f2a8f074021cbae3becb5a9eae5199 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=parisc SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): hppa-linux-ld: drivers/ptp/ptp_pch.o: in function `pch_rx_snap_read': hppa-linux-ld: drivers/ptp/ptp_pch.o: in function `pch_tx_snap_read': (.text+0x3ac): undefined reference to `ioread64_lo_hi' hppa-linux-ld: drivers/ptp/ptp_pch.o: in function `pch_set_station_address': hppa-linux-ld: drivers/ptp/ptp_pch.o: in function `ptp_pch_settime': hppa-linux-ld: drivers/ptp/ptp_pch.o: in function `ptp_pch_adjtime': hppa-linux-ld: drivers/ptp/ptp_pch.o: in function `ptp_pch_gettime': ptp_pch.o:(.text+0x9d0): undefined reference to `ioread64_lo_hi' hppa-linux-ld: drivers/ptp/ptp_pch.o: in function `pch_probe': ptp_pch.o:(.text+0xd60): undefined reference to `iowrite64_lo_hi' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org