1 diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
2 index 204e3ba..3132414 100644
3 --- a/arch/x86/xen/mmu.c
4 +++ b/arch/x86/xen/mmu.c
5 @@ -1666,6 +1666,7 @@ static void xen_flush_tlb_single(unsigned long addr)
6 static void xen_flush_tlb_others(const struct cpumask *cpus,
7 struct mm_struct *mm, unsigned long va)
9 + extern unsigned int num_processors;
12 DECLARE_BITMAP(mask, num_processors);