diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 2cc2aa120b4b..3f57ce68a3f1 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -757,6 +757,7 @@ const struct cpumask *cpu_clustergroup_mask(int cpu)
 {
 	return cpu_l2c_shared_mask(cpu);
 }
+EXPORT_SYMBOL_GPL(cpu_clustergroup_mask);
 
 static void impress_friends(void)
 {