Hi Sean, FYI, the error/warning still remains. tree: https://github.com/frank-w/BPI-R2-4.14 5.4-r64-rc head: 674455af354a65fbb527eaf761ae932864b41c6f commit: 810664cc290092b0c9fde935f1bf75aee787801b [6/19] net: phy: add rtl8367 switch phy config: arm-allmodconfig (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 7.4.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 810664cc290092b0c9fde935f1bf75aee787801b # save the attached .config to linux build tree GCC_VERSION=7.4.0 make.cross ARCH=arm If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from drivers/net/phy/rtk/rtl8367s_mdio.c:24:0: #include <rtk_types.h> ^~~~~~~~~~~~~ compilation terminated. -- #include <rtk_switch.h> ^~~~~~~~~~~~~~ compilation terminated. -- #include <rtk_switch.h> ^~~~~~~~~~~~~~ compilation terminated. -- #include <rtk_switch.h> ^~~~~~~~~~~~~~ compilation terminated. -- #include <rtk_switch.h> ^~~~~~~~~~~~~~ compilation terminated. -- #include <rtk_switch.h> ^~~~~~~~~~~~~~ compilation terminated. -- #include <rtk_switch.h> ^~~~~~~~~~~~~~ compilation terminated. -- #include <rtk_switch.h> ^~~~~~~~~~~~~~ compilation terminated. -- #include <rtk_switch.h> ^~~~~~~~~~~~~~ compilation terminated. -- #include <rtk_switch.h> ^~~~~~~~~~~~~~ compilation terminated. -- #include <rtk_switch.h> ^~~~~~~~~~~~~~ compilation terminated. .. vim +21 drivers/net/phy/rtk/./rtl8367c/include/rtk_switch.h 20 22 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation