--- old/src/hotspot/share/gc/serial/serialHeap.hpp	2020-04-27 10:19:40.575264151 +0200
+++ new/src/hotspot/share/gc/serial/serialHeap.hpp	2020-04-27 10:19:40.391261156 +0200
@@ -76,9 +76,8 @@
   void oop_since_save_marks_iterate(OopClosureType1* cur,
                                     OopClosureType2* older);
 
-  // Runs the given AbstractGangTask with the current active workers, returning the
-  // total time taken.
-  virtual Tickspan run_task(AbstractGangTask* task);
+  // Runs the given AbstractGangTask with the current active workers.
+  virtual void run_task(AbstractGangTask* task);
 };
 
 #endif // SHARE_GC_SERIAL_SERIALHEAP_HPP