--- a/hotspot/src/os_cpu/linux_x86/vm/os_linux_x86.hpp	Mon Dec 26 20:36:01 2011 -0500
+++ b/hotspot/src/os_cpu/linux_x86/vm/os_linux_x86.hpp	Sun Jan 01 11:17:59 2012 -0500
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -28,6 +28,8 @@
   static void setup_fpu();
   static bool supports_sse();
 
+  static jlong rdtsc();
+
   static bool is_allocatable(size_t bytes);
 
   // Used to register dynamic code cache area with the OS