[linux-next:master 5963/5971] futex.c:undefined reference to `__arch_atomic_add_unless'

[kbuild test robot <fengguang.wu@intel.com>]

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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:   8f8ab14f4414e1be0e7c23036017e3e3130ba7cd
commit: 2ef5da008877ad2222e9a8964d39cf50fd2236d7 [5963/5971] x86-atomic-move-__atomic_add_unless-out-of-line-fix
config: um-alldefconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 2ef5da008877ad2222e9a8964d39cf50fd2236d7
        # save the attached .config to linux build tree
        make ARCH=um 

All errors (new ones prefixed by >>):

   kernel/built-in.o: In function `get_task_cred':
   (.text+0x23d34): undefined reference to `__arch_atomic_add_unless'
   kernel/built-in.o: In function `atomic_dec_and_mutex_lock':
   (.text+0x2f166): undefined reference to `__arch_atomic_add_unless'
   kernel/built-in.o: In function `get_pi_state':
>> futex.c:(.text+0x4b1c1): undefined reference to `__arch_atomic_add_unless'
   kernel/built-in.o: In function `get_futex_key':
   futex.c:(.text+0x4ba2a): undefined reference to `__arch_atomic_add_unless'
   mm/built-in.o: In function `oom_reaper':
>> oom_kill.c:(.text+0x4b36): undefined reference to `__arch_atomic_add_unless'
   mm/built-in.o:(.text+0x10e01): more undefined references to `__arch_atomic_add_unless' follow
   collect2: error: ld returned 1 exit status

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