tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: ff90dfd2579b2c7bc1f0baa0cb99c918c6c1ec64 commit: 40d3f295b5feda409784e569550057b5fbc2a295 [11003/11791] net: mscc: ocelot: use common tag parsing code with DSA config: i386-randconfig-a006-20200816 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 40d3f295b5feda409784e569550057b5fbc2a295 # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Note: the linux-next/master HEAD ff90dfd2579b2c7bc1f0baa0cb99c918c6c1ec64 builds fine. It may have been fixed somewhere. All errors (new ones prefixed by >>): ld: drivers/net/ethernet/mscc/ocelot.o: in function `ocelot_ifh_set_bypass': ld: drivers/net/ethernet/mscc/ocelot.o: in function `ocelot_ifh_set_dest': include/linux/dsa/ocelot.h:190: undefined reference to `packing' ld: drivers/net/ethernet/mscc/ocelot.o: in function `ocelot_ifh_set_tag_type': include/linux/dsa/ocelot.h:200: undefined reference to `packing' ld: drivers/net/ethernet/mscc/ocelot.o: in function `ocelot_ifh_set_vid': include/linux/dsa/ocelot.h:205: undefined reference to `packing' ld: drivers/net/ethernet/mscc/ocelot.o: in function `ocelot_ifh_set_rew_op': include/linux/dsa/ocelot.h:185: undefined reference to `packing' ld: drivers/net/ethernet/mscc/ocelot_vsc7514.o:include/linux/dsa/ocelot.h:160: more undefined references to `packing' follow vim +180 include/linux/dsa/ocelot.h 177 178 static inline void ocelot_ifh_set_bypass(void *injection, u64 bypass) 179 { 181 } 182 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org