documentation: Remove obsolete reference to RCU-protected indexes

Commit #1ebee8017d84 (rcu: Eliminate array-index-based RCU primitives)
eliminated the primitives supporting RCU-protected array indexes, but
failed to update Documentation/memory-barriers.txt accordingly.  This
commit therefore removes the discussion of RCU-protected array indexes.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

diff --git a/Documentation/memory-barriers.txt b/Documentation/memory-barriers.txt
index c90922b..6bee0a2 100644 (file)
--- a/Documentation/memory-barriers.txt
+++ b/Documentation/memory-barriers.txt
@@ -565,21 +565,6 @@ odd-numbered bank is idle, one can see the new value of the pointer P (&B),
 but the old value of the variable B (2).
 
 
-Another example of where data dependency barriers might be required is where a
-number is read from memory and then used to calculate the index for an array
-access:
-
-       CPU 1                 CPU 2
-       ===============       ===============
-       { M[0] == 1, M[1] == 2, M[3] = 3, P == 0, Q == 3 }
-       M[1] = 4;
-       <write barrier>
-       WRITE_ONCE(P, 1);
-                             Q = READ_ONCE(P);
-                             <data dependency barrier>
-                             D = M[Q];
-
-
 The data dependency barrier is very important to the RCU system,
 for example.  See rcu_assign_pointer() and rcu_dereference() in
 include/linux/rcupdate.h.  This permits the current target of an RCU'd