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@intel.com>

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: misc.c:(.text+0x392): undefined reference to `pmu_wait_complete'
   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: misc.c:(.text+0xaf2): undefined reference to `pmu_set_rtc_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'
>> m68k-linux-ld: drivers/macintosh/adb.o:(.rodata+0xb2): undefined reference to `via_pmu_driver'

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0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org