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| author | Richard Braun <rbraun@sceen.net> | 2012-12-13 11:07:32 +0100 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2013-01-08 23:14:55 +0100 |
| commit | 7e8b1e78ea028cbd32337e2aea574a8466c796bb (patch) | |
| tree | 5d1f009d9292ad680b8a7a58930bb02139d377e3 /Documentation/atomic_ops.txt | |
| parent | rcu: Reduce rcutorture tracing (diff) | |
| download | linux-7e8b1e78ea028cbd32337e2aea574a8466c796bb.tar.xz linux-7e8b1e78ea028cbd32337e2aea574a8466c796bb.zip | |
Documentation: Memory barrier semantics of atomic_xchg()
Add atomic_xchg() to documentation for atomic operations and
memory barriers.
Signed-off-by: Richard Braun <rbraun@sceen.net>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'Documentation/atomic_ops.txt')
| -rw-r--r-- | Documentation/atomic_ops.txt | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/atomic_ops.txt b/Documentation/atomic_ops.txt index 27f2b21a9d5c..d9ca5be9b471 100644 --- a/Documentation/atomic_ops.txt +++ b/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, |