--- old/src/hotspot/share/gc/g1/g1OopStarChunkedList.hpp	2019-03-13 14:03:08.377227503 +0100
+++ new/src/hotspot/share/gc/g1/g1OopStarChunkedList.hpp	2019-03-13 14:03:08.160221610 +0100
@@ -41,8 +41,8 @@
   template <typename T> void delete_list(ChunkedList<T*, mtGC>* c);
 
   template <typename T>
-  void chunks_do(ChunkedList<T*, mtGC>* head,
-                 OopClosure* cl);
+  size_t chunks_do(ChunkedList<T*, mtGC>* head,
+                   OopClosure* cl);
 
   template <typename T>
   inline void push(ChunkedList<T*, mtGC>** field, T* p);
@@ -53,7 +53,7 @@
 
   size_t used_memory() { return _used_memory; }
 
-  void oops_do(OopClosure* obj_cl, OopClosure* root_cl);
+  size_t oops_do(OopClosure* obj_cl, OopClosure* root_cl);
 
   inline void push_oop(oop* p);
   inline void push_oop(narrowOop* p);