Commit 79269ee3 authored by Paul E. McKenney's avatar Paul E. McKenney

doc/atomic_ops: Clarify smp_mb__{before,after}_atomic()

This commit explicitly states that surrounding a non-value-returning
atomic read-modify atomic operations provides full ordering, just as
is provided by value-returning atomic read-modify-write operations.
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent f60cb4d4
...@@ -303,6 +303,11 @@ defined which accomplish this:: ...@@ -303,6 +303,11 @@ defined which accomplish this::
void smp_mb__before_atomic(void); void smp_mb__before_atomic(void);
void smp_mb__after_atomic(void); void smp_mb__after_atomic(void);
Preceding a non-value-returning read-modify-write atomic operation with
smp_mb__before_atomic() and following it with smp_mb__after_atomic()
provides the same full ordering that is provided by value-returning
read-modify-write atomic operations.
For example, smp_mb__before_atomic() can be used like so:: For example, smp_mb__before_atomic() can be used like so::
obj->dead = 1; obj->dead = 1;
......
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