[luto:x86/mm 7/7] arceb-elf-ld: fork.c:undefined reference to `arch_fixup_lazy_mm_refs'

[kernel test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git x86/mm
head:   7c4bcc0a464ca60be1e0aeba805a192be0ee81e5
commit: 7c4bcc0a464ca60be1e0aeba805a192be0ee81e5 [7/7] [MOCKUP] x86/mm: Lightweight lazy mm refcounting
config: arc-randconfig-r023-20201203 (attached as .config)
compiler: arceb-elf-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git/commit/?id=7c4bcc0a464ca60be1e0aeba805a192be0ee81e5
        git remote add luto https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git
        git fetch --no-tags luto x86/mm
        git checkout 7c4bcc0a464ca60be1e0aeba805a192be0ee81e5
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc 

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

All errors (new ones prefixed by >>):

   arceb-elf-ld: kernel/fork.o: in function `mmput_async_fn':
   fork.c:(.text+0xf88): undefined reference to `arch_fixup_lazy_mm_refs'
>> arceb-elf-ld: fork.c:(.text+0xf88): undefined reference to `arch_fixup_lazy_mm_refs'
   arceb-elf-ld: kernel/fork.o: in function `mmput':
   fork.c:(.text+0x1216): undefined reference to `arch_fixup_lazy_mm_refs'
   arceb-elf-ld: fork.c:(.text+0x1216): undefined reference to `arch_fixup_lazy_mm_refs'
   arceb-elf-ld: lib/stackdepot.o: in function `filter_irq_stacks':
   stackdepot.c:(.text+0x4d6): undefined reference to `__irqentry_text_start'
   arceb-elf-ld: stackdepot.c:(.text+0x4d6): undefined reference to `__irqentry_text_start'
   arceb-elf-ld: stackdepot.c:(.text+0x4f6): undefined reference to `__irqentry_text_end'
   arceb-elf-ld: stackdepot.c:(.text+0x4f6): undefined reference to `__irqentry_text_end'
   arceb-elf-ld: stackdepot.c:(.text+0x4fe): undefined reference to `__softirqentry_text_start'
   arceb-elf-ld: stackdepot.c:(.text+0x4fe): undefined reference to `__softirqentry_text_start'
   arceb-elf-ld: stackdepot.c:(.text+0x506): undefined reference to `__softirqentry_text_end'
   arceb-elf-ld: stackdepot.c:(.text+0x506): undefined reference to `__softirqentry_text_end'

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

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