--- a/hotspot/src/share/vm/gc_implementation/parallelScavenge/parMarkBitMap.cpp	Fri Mar 28 11:52:29 2008 -0700
+++ b/hotspot/src/share/vm/gc_implementation/parallelScavenge/parMarkBitMap.cpp	Fri Mar 28 23:35:42 2008 -0700
@@ -41,7 +41,7 @@
 
   const size_t rs_align = page_sz == (size_t) os::vm_page_size() ? 0 :
     MAX2(page_sz, granularity);
-  ReservedSpace rs(bytes, rs_align, false);
+  ReservedSpace rs(bytes, rs_align, rs_align > 0);
   os::trace_page_sizes("par bitmap", raw_bytes, raw_bytes, page_sz,
                        rs.base(), rs.size());
   _virtual_space = new PSVirtualSpace(rs, page_sz);