vmx.c:undefined reference to `boot_cpu_physical_apicid'

[kbuild test robot]

Hi Paolo,

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
master
head:   42b76d0e6b1fe0fcb90e0ff6b4d053d50597b031
commit: c0a1666bcb2a33e84187a15eabdcd54056be9a97 KVM: VMX: use cmpxchg64
date:   7 days ago
config: i386-randconfig-c0-10052314 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        git checkout c0a1666bcb2a33e84187a15eabdcd54056be9a97
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   arch/x86/kvm/vmx.o: In function `__pi_post_block':
>> vmx.c:(.text+0x174a): undefined reference to `boot_cpu_physical_apicid'
   arch/x86/kvm/vmx.o: In function `vmx_vcpu_load':
   vmx.c:(.text+0xb5fd): undefined reference to `boot_cpu_physical_apicid'
   vmx.c:(.text+0xb66d): undefined reference to `boot_cpu_physical_apicid'

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