[tip:smp/hotplug 3/4] enlighten.c:undefined reference to `xen_smp_intr_free'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git smp/hotplug
head:   484afa6961eb9409ea120b38397e6883696d8aa6
commit: 4c90758355117d2b6343ec6d0d37e10842ede11f [3/4] xen/x86: Move irq allocation from Xen smp_op.cpu_up()
config: x86_64-randconfig-s0-07230529 (attached as .config)
compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7
reproduce:
        git checkout 4c90758355117d2b6343ec6d0d37e10842ede11f
        # 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 `xen_cpu_notify':
>> enlighten.c:(.text+0x11255): undefined reference to `xen_smp_intr_free'
>> enlighten.c:(.text+0x11285): undefined reference to `xen_smp_intr_init'
   enlighten.c:(.text+0x112b6): undefined reference to `xen_smp_intr_free'

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