diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index a7eb82d9b0120d02147d8eb1620a7da1d708c282..befe4982198ae12ad30aec1d85d7714597877feb 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -62,6 +62,7 @@ unsigned disabled_cpus;
 
 /* Processor that is doing the boot up */
 unsigned int boot_cpu_physical_apicid = -1U;
+EXPORT_SYMBOL_GPL(boot_cpu_physical_apicid);
 
 /*
  * The highest APIC ID seen during enumeration.