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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: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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Paul E. McKenney 2017-04-19 14:30:37 -07:00
parent f60cb4d4c8
commit 79269ee3fa
1 changed files with 5 additions and 0 deletions
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5
Documentation/core-api/atomic_ops.rst
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@ -303,6 +303,11 @@ defined which accomplish this::
void smp_mb__before_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::
obj->dead = 1;