[MOCKUP] x86/mm: Lightweight lazy mm refcounting

[kernel test robot]

Hi Andy,

I love your patch! Yet something to improve:

[auto build test ERROR on tip/x86/core]
[also build test ERROR on tip/x86/mm soc/for-next linus/master v5.10-rc6 next-20201201]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Andy-Lutomirski/x86-mm-Lightweight-lazy-mm-refcounting/20201203-132706
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 238c91115cd05c71447ea071624a4c9fe661f970
config: m68k-randconfig-s032-20201203 (attached as .config)
compiler: m68k-linux-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.3-179-ga00755aa-dirty
        # https://github.com/0day-ci/linux/commit/0d9b23b22e621d8e588095b4d0f9f39110a57901
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Andy-Lutomirski/x86-mm-Lightweight-lazy-mm-refcounting/20201203-132706
        git checkout 0d9b23b22e621d8e588095b4d0f9f39110a57901
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=m68k 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>

All errors (new ones prefixed by >>):

   m68k-linux-ld: kernel/fork.o: in function `__mmput':
>> fork.c:(.text+0x214): undefined reference to `arch_fixup_lazy_mm_refs'
   m68k-linux-ld: kernel/fork.o: in function `mmput_async_fn':
   fork.c:(.text+0x990): undefined reference to `arch_fixup_lazy_mm_refs'
   m68k-linux-ld: kernel/fork.o: in function `mmput':
   fork.c:(.text+0xa68): undefined reference to `arch_fixup_lazy_mm_refs'
   m68k-linux-ld: kernel/fork.o: in function `dup_mm.isra.0':
   fork.c:(.text+0x1192): undefined reference to `arch_fixup_lazy_mm_refs'
   m68k-linux-ld: kernel/fork.o: in function `mm_access':
   fork.c:(.text+0x13c6): undefined reference to `arch_fixup_lazy_mm_refs'

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