Hi Andrew, It's probably a bug fix that unveils the link errors. tree: https://github.com/hnaz/linux-mm master head: c9b1ae5de27944bbd8a2ac03a59e1efb5b710d89 commit: f2e889ea3f071a7f4b0a182b97dd2ede2c37d818 [313/361] linux-next-git-rejects config: m68k-allmodconfig (attached as .config) compiler: m68k-linux-gcc (GCC) 9.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout f2e889ea3f071a7f4b0a182b97dd2ede2c37d818 # save the attached .config to linux build tree GCC_VERSION=9.2.0 make.cross ARCH=m68k 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 >>): m68k-linux-ld: arch/m68k/mac/config.o: in function `config_mac': config.c:(.init.text+0x5fa): undefined reference to `find_via_pmu' m68k-linux-ld: arch/m68k/mac/misc.o: in function `mac_reset': misc.c:(.text+0x214): undefined reference to `pmu_restart' m68k-linux-ld: arch/m68k/mac/misc.o: in function `mac_pram_read_byte': misc.c:(.text+0x382): undefined reference to `pmu_request' m68k-linux-ld: arch/m68k/mac/misc.o: in function `mac_pram_write_byte': misc.c:(.text+0x4ac): undefined reference to `pmu_request' m68k-linux-ld: misc.c:(.text+0x4bc): undefined reference to `pmu_wait_complete' m68k-linux-ld: arch/m68k/mac/misc.o: in function `mac_poweroff': misc.c:(.text+0x5d2): undefined reference to `pmu_shutdown' m68k-linux-ld: arch/m68k/mac/misc.o: in function `mac_hwclk': misc.c:(.text+0x6f2): undefined reference to `pmu_get_time' m68k-linux-ld: drivers/macintosh/via-pmu-event.o: in function `via_pmu_event_init': via-pmu-event.c:(.init.text+0x8): undefined reference to `pmu_get_model' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org