[linux-next:master 4332/4339] fork.c:undefined reference to `__arch_atomic_add_unless'

[linux-next:master 4332/4339] fork.c:undefined reference to `__arch_atomic_add_unless'

[kbuild test robot]

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Hi Andrew,

It's probably a bug fix that unveils the link errors.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   f921b263d9602fb7873710c2df70671f2ffcf658
commit: 0585aae2b6b48d94a903a1e4d51751204a46ea61 [4332/4339] x86-atomic-move-__atomic_add_unless-out-of-line-fix
config: um-allnoconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 0585aae2b6b48d94a903a1e4d51751204a46ea61
        # save the attached .config to linux build tree
        make ARCH=um 

All errors (new ones prefixed by >>):

   kernel/built-in.o: In function `copy_process.isra.10.part.11':
>> fork.c:(.text+0xf59): undefined reference to `__arch_atomic_add_unless'
   kernel/built-in.o: In function `get_mm_exe_file':
>> (.text+0x1818): undefined reference to `__arch_atomic_add_unless'
   kernel/built-in.o: In function `get_task_exe_file':
   (.text+0x1878): undefined reference to `__arch_atomic_add_unless'
   kernel/built-in.o: In function `get_task_cred':
   (.text+0x18383): undefined reference to `__arch_atomic_add_unless'
   kernel/built-in.o: In function `prepare_kernel_cred':
   (.text+0x186cd): undefined reference to `__arch_atomic_add_unless'
   kernel/built-in.o:(.text+0x2137d): more undefined references to `__arch_atomic_add_unless' follow
   collect2: error: ld returned 1 exit status

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