diff -r dfb38ea7da17 -r 3dc12ef8735e src/share/vm/runtime/globals.hpp
--- a/src/share/vm/runtime/globals.hpp	Thu Sep 30 12:05:08 2010 -0400
+++ b/src/share/vm/runtime/globals.hpp	Thu Oct 07 15:12:57 2010 -0400
@@ -323,10 +323,10 @@
   /* UseMembar is theoretically a temp flag used for memory barrier         \
    * removal testing.  It was supposed to be removed before FCS but has     \
    * been re-added (see 6401008) */                                         \
-  product(bool, UseMembar, false,                                           \
+  product_pd(bool, UseMembar,                                               \
           "(Unstable) Issues membars on thread state transitions")          \
                                                                             \
-  /* Temporary: See 6948537 */                                             \
+  /* Temporary: See 6948537 */                                              \
   experimental(bool, UseMemSetInBOT, true,                                  \
           "(Unstable) uses memset in BOT updates in GC code")               \
                                                                             \