[vfs:for-linus 1/8] arch/x86/built-in.o:undefined reference to `compat_sys_io_setup'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git for-linus
head:   d0375bfcdd0de588d9f8ee7ac9d2bc93c333e4fe
commit: e46c3fc8ff9e7aa152ef078af7067d5391f4fe18 [1/8] move aio compat to fs/aio.c
config: x86_64-randconfig-s2-12230841 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout e46c3fc8ff9e7aa152ef078af7067d5391f4fe18
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

>> arch/x86/built-in.o:(.rodata+0x10f8): undefined reference to `compat_sys_io_setup'
>> arch/x86/built-in.o:(.rodata+0x1100): undefined reference to `compat_sys_io_submit'
   arch/x86/built-in.o:(.rodata+0x1b48): undefined reference to `compat_sys_io_setup'
>> arch/x86/built-in.o:(.rodata+0x1b58): undefined reference to `compat_sys_io_getevents'
   arch/x86/built-in.o:(.rodata+0x1b60): undefined reference to `compat_sys_io_submit'

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