--- a/src/hotspot/share/gc/shared/genCollectedHeap.hpp	Mon May 07 14:42:04 2018 +0200
+++ b/src/hotspot/share/gc/shared/genCollectedHeap.hpp	Mon May 07 14:42:05 2018 +0200
@@ -63,10 +63,11 @@
     OldGen
   };
 
-private:
+protected:
   Generation* _young_gen;
   Generation* _old_gen;
 
+private:
   GenerationSpec* _young_gen_spec;
   GenerationSpec* _old_gen_spec;
 
@@ -161,8 +162,6 @@
                    Generation::Name old,
                    const char* policy_counters_name);
 
-  virtual void check_gen_kinds() = 0;
-
 public:
 
   // Returns JNI_OK on success