Documentation/memory-barriers.txt: Add long atomic examples to memory-barriers.txt

Although the atomic_long_t functions are quite useful, they are
a bit obscure.  This commit therefore adds the common ones
alongside their atomic_t counterparts in
Documentation/memory-barriers.txt.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Reviewed-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: <linux-arch@vger.kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/1386799151-2219-2-git-send-email-paulmck@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 13 insertions, 11 deletions

diff --git a/Documentation/memory-barriers.txt b/Documentation/memory-barriers.txt
index 1d067235b0bc..2d22da095a60 100644
--- a/Documentation/memory-barriers.txt
+++ b/Documentation/memory-barriers.txt
@@ -1728,21 +1728,23 @@ explicit lock operations, described later).  These include:
 
         xchg();
         cmpxchg();
-        atomic_xchg();
-        atomic_cmpxchg();
-        atomic_inc_return();
-        atomic_dec_return();
-        atomic_add_return();
-        atomic_sub_return();
-        atomic_inc_and_test();
-        atomic_dec_and_test();
-        atomic_sub_and_test();
-        atomic_add_negative();
-        atomic_add_unless();    /* when succeeds (returns 1) */
+        atomic_xchg();                  atomic_long_xchg();
+        atomic_cmpxchg();               atomic_long_cmpxchg();
+        atomic_inc_return();            atomic_long_inc_return();
+        atomic_dec_return();            atomic_long_dec_return();
+        atomic_add_return();            atomic_long_add_return();
+        atomic_sub_return();            atomic_long_sub_return();
+        atomic_inc_and_test();          atomic_long_inc_and_test();
+        atomic_dec_and_test();          atomic_long_dec_and_test();
+        atomic_sub_and_test();          atomic_long_sub_and_test();
+        atomic_add_negative();          atomic_long_add_negative();
         test_and_set_bit();
         test_and_clear_bit();
         test_and_change_bit();
 
+        /* when succeeds (returns 1) */
+        atomic_add_unless();            atomic_long_add_unless();
+
 These are used for such things as implementing LOCK-class and UNLOCK-class
 operations and adjusting reference counters towards object destruction, and as
 such the implicit memory barrier effects are necessary.