diff -r 35e4e086d5f5 -r 9f4848ebbabd src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp
--- a/src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp	Thu Oct 14 10:38:14 2010 -0400
+++ b/src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp	Fri Oct 15 17:26:56 2010 -0400
@@ -1159,9 +1159,7 @@
   _hrrs(NULL),
   _g1h(G1CollectedHeap::heap()),
   _bosa(NULL),
-  _sparse_iter(size_t(G1CollectedHeap::heap()->reserved_region().start())
-               >> CardTableModRefBS::card_shift)
-{}
+  _sparse_iter() { }
 
 void HeapRegionRemSetIterator::initialize(const HeapRegionRemSet* hrrs) {
   _hrrs = hrrs;