diff --git a/include/linux/dmar.h b/include/linux/dmar.h
index 3ab07e4..c4e96eb 100644
--- a/include/linux/dmar.h
+++ b/include/linux/dmar.h
@@ -47,6 +47,7 @@
 extern int dmar_table_init(void);
 extern int early_dmar_detect(void);
 extern int dmar_dev_scope_init(void);
+extern int parse_ioapics_under_ir(void);
 
 extern struct list_head dmar_drhd_units;
 extern struct list_head dmar_rmrr_units;