[PATCH] Yet another RCU documentation update

Update RCU documentation based on discussions and review of RCU-based tree
patches.  Add an introductory whatisRCU.txt file.

Signed-off-by: <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 48 insertions, 0 deletions

diff --git a/Documentation/RCU/rcu.txt b/Documentation/RCU/rcu.txt
index eb444006683e..6fa092251586 100644
--- a/Documentation/RCU/rcu.txt
+++ b/Documentation/RCU/rcu.txt
@@ -64,6 +64,54 @@ o	I hear that RCU is patented?  What is with that?
         Of these, one was allowed to lapse by the assignee, and the
         others have been contributed to the Linux kernel under GPL.
 
+o       I hear that RCU needs work in order to support realtime kernels?
+
+        Yes, work in progress.
+
 o       Where can I find more information on RCU?
 
         See the RTFP.txt file in this directory.
+        Or point your browser at http://www.rdrop.com/users/paulmck/RCU/.
+
+o       What are all these files in this directory?
+
+
+        NMI-RCU.txt
+
+                Describes how to use RCU to implement dynamic
+                NMI handlers, which can be revectored on the fly,
+                without rebooting.
+
+        RTFP.txt
+
+                List of RCU-related publications and web sites.
+
+        UP.txt
+
+                Discussion of RCU usage in UP kernels.
+
+        arrayRCU.txt
+
+                Describes how to use RCU to protect arrays, with
+                resizeable arrays whose elements reference other
+                data structures being of the most interest.
+
+        checklist.txt
+
+                Lists things to check for when inspecting code that
+                uses RCU.
+
+        listRCU.txt
+
+                Describes how to use RCU to protect linked lists.
+                This is the simplest and most common use of RCU
+                in the Linux kernel.
+
+        rcu.txt
+
+                You are reading it!
+
+        whatisRCU.txt
+
+                Overview of how the RCU implementation works.  Along
+                the way, presents a conceptual view of RCU.