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Documentation: Memory barrier semantics of atomic_xchg()

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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>
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Richard Braun 2012-12-13 11:07:32 +01:00 committed by Paul E. McKenney
parent 5249453510
commit 7e8b1e78ea
2 changed files with 3 additions and 0 deletions
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2
Documentation/atomic_ops.txt
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@ -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,

1
Documentation/memory-barriers.txt
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@ -1685,6 +1685,7 @@ explicit lock operations, described later). These include:
xchg();
cmpxchg();
atomic_xchg();
atomic_cmpxchg();
atomic_inc_return();
atomic_dec_return();