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>
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@ -253,6 +253,8 @@ This performs an atomic exchange operation on the atomic variable v, setting
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the given new value. It returns the old value that the atomic variable v had
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just before the operation.
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atomic_xchg requires explicit memory barriers around the operation.
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int atomic_cmpxchg(atomic_t *v, int old, int new);
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This performs an atomic compare exchange operation on the atomic value v,
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@ -1685,6 +1685,7 @@ explicit lock operations, described later). These include:
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xchg();
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cmpxchg();
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atomic_xchg();
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atomic_cmpxchg();
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atomic_inc_return();
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atomic_dec_return();
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