[linux-next:master 7056/7206] main.c:undefined reference to `stop_machine'

[kbuild test robot <fengguang.wu@xxxxxxxxx>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   f7ac28a6971b43a2ee8bb47c0ef931b38f7888cf
commit: 64dab25b058c12f935794cb239089303bda7dbc1 [7056/7206] kernel/stop_machine.c: remove CONFIG_SMP dependencies
config: x86_64-randconfig-i0-201550 (attached as .config)
reproduce:
        git checkout 64dab25b058c12f935794cb239089303bda7dbc1
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   arch/x86/built-in.o: In function `set_mtrr':
>> main.c:(.text+0x36a01): undefined reference to `stop_machine'
   arch/x86/built-in.o: In function `mtrr_ap_init':
>> (.text+0x373e1): undefined reference to `stop_machine_from_inactive_cpu'
   kernel/built-in.o: In function `timekeeping_notify':
>> (.text+0x673a2): undefined reference to `stop_machine'
   mm/built-in.o: In function `build_all_zonelists':
>> (.ref.text+0x151): undefined reference to `stop_machine'

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