---

yaml --- r: 349795 b: refs/heads/master c: 7e8b1e7 h: refs/heads/master i: 349793: 532270d 349791: c3890cf v: v3
git-mirror · Jan 8, 2013 · 872ff78 · 872ff78
1 parent c474b99
commit 872ff78
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Showing 3 changed files with 4 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 52494535103986dbbf689b44d8c2c7efe2132b16
+refs/heads/master: 7e8b1e78ea028cbd32337e2aea574a8466c796bb
diff --git a/trunk/Documentation/atomic_ops.txt b/trunk/Documentation/atomic_ops.txt
@@ -253,6 +253,8 @@ This performs an atomic exchange operation on the atomic variable v, setting
 the given new value.  It returns the old value that the atomic variable v had
 just before the operation.
 
+atomic_xchg requires explicit memory barriers around the operation.
+
 	int atomic_cmpxchg(atomic_t *v, int old, int new);
 
 This performs an atomic compare exchange operation on the atomic value v,

diff --git a/trunk/Documentation/memory-barriers.txt b/trunk/Documentation/memory-barriers.txt
@@ -1685,6 +1685,7 @@ explicit lock operations, described later).  These include:
 
 	xchg();
 	cmpxchg();
+	atomic_xchg();
 	atomic_cmpxchg();
 	atomic_inc_return();
 	atomic_dec_return();