--- a/hotspot/src/share/vm/runtime/globals.hpp	Fri Feb 17 15:11:32 2012 -0800
+++ b/hotspot/src/share/vm/runtime/globals.hpp	Thu Feb 23 14:58:35 2012 +0100
@@ -3896,7 +3896,10 @@
   product(bool, UseVMInterruptibleIO, false,                                \
           "(Unstable, Solaris-specific) Thread interrupt before or with "   \
           "EINTR for I/O operations results in OS_INTRPT. The default value"\
-          " of this flag is true for JDK 6 and earlier")
+          " of this flag is true for JDK 6 and earlier")                    \
+                                                                            \
+  diagnostic(bool, WhiteBoxAPI, false,                                      \
+          "Enable internal testing APIs")
 
 /*
  *  Macros for factoring of globals