--- a/src/hotspot/share/gc/g1/vmStructs_g1.hpp	Fri Nov 22 10:03:38 2019 +0100
+++ b/src/hotspot/share/gc/g1/vmStructs_g1.hpp	Fri Nov 22 10:03:38 2019 +0100
@@ -38,9 +38,9 @@
   static_field(HeapRegion, LogOfHRGrainBytes, int)                            \
                                                                               \
   nonstatic_field(HeapRegion, _type,           HeapRegionType)                \
-  nonstatic_field(HeapRegion, _bottom,         HeapWord*)                     \
+  nonstatic_field(HeapRegion, _bottom,         HeapWord* const)               \
   nonstatic_field(HeapRegion, _top,            HeapWord* volatile)            \
-  nonstatic_field(HeapRegion, _end,            HeapWord*)                     \
+  nonstatic_field(HeapRegion, _end,            HeapWord* const)               \
   nonstatic_field(HeapRegion, _compaction_top, HeapWord*)                     \
                                                                               \
   nonstatic_field(HeapRegionType, _tag,       HeapRegionType::Tag volatile)   \