diff --git a/include/asm-s390/smp.h b/include/asm-s390/smp.h
index a464a66..6f3821a6 100644
--- a/include/asm-s390/smp.h
+++ b/include/asm-s390/smp.h
@@ -91,6 +91,7 @@
 extern int __cpu_up (unsigned int cpu);
 
 extern struct mutex smp_cpu_state_mutex;
+extern int smp_cpu_polarization[];
 
 extern int smp_call_function_mask(cpumask_t mask, void (*func)(void *),
 	void *info, int wait);