--- a/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp	Mon Apr 22 20:27:36 2013 +0200
+++ b/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp	Mon Apr 22 22:00:03 2013 -0700
@@ -3426,8 +3426,9 @@
 void ConcurrentMarkSweepGeneration::shrink_free_list_by(size_t bytes) {
   assert_locked_or_safepoint(Heap_lock);
   assert_lock_strong(freelistLock());
-  // XXX Fix when compaction is implemented.
-  warning("Shrinking of CMS not yet implemented");
+  if (PrintGCDetails && Verbose) {
+    warning("Shrinking of CMS not yet implemented");
+  }
   return;
 }