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-rw-r--r--Documentation/core-api/atomic_ops.rst5
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/core-api/atomic_ops.rst b/Documentation/core-api/atomic_ops.rst
index 55e43f1c80de..fce929144ccd 100644
--- a/Documentation/core-api/atomic_ops.rst
+++ b/Documentation/core-api/atomic_ops.rst
@@ -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;