[PATCH V2] reference rt-mutex-design in rtmutex.c

[Steven Rostedt <rostedt@goodmis.org>]

[V2 - update per Ingo's request]

In order to prevent Doc Rot, this patch adds a reference to the design
document for rtmutex.c in rtmutex.c.  So when someone needs to update or
change the design of that file they will know that a document actually
exists that explains the design (helping them change it), and hopefully
that they will update the document if they too change the design.

-- Steve

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

Index: linux-2.6.18-rc2/kernel/rtmutex.c
===================================================================
--- linux-2.6.18-rc2.orig/kernel/rtmutex.c	2006-07-16 19:53:46.000000000 -0400
+++ linux-2.6.18-rc2/kernel/rtmutex.c	2006-07-26 08:24:14.000000000 -0400
@@ -7,6 +7,8 @@
  *  Copyright (C) 2005-2006 Timesys Corp., Thomas Gleixner <tglx@timesys.com>
  *  Copyright (C) 2005 Kihon Technologies Inc., Steven Rostedt
  *  Copyright (C) 2006 Esben Nielsen
+ *
+ *  See Documentation/rt-mutex-design.txt for details.
  */
 #include <linux/spinlock.h>
 #include <linux/module.h>