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    Subject[PATCH tip/core/rcu 5/5] documentation: Add lockless_dereference()
    Date
    The recently added lockless_dereference() macro is not present in the
    Documentation/ directory, so this commit fixes that.

    Reported-by: Dmitry Vyukov <dvyukov@google.com>
    Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    ---
    Documentation/memory-barriers.txt | 11 +++++++++++
    1 file changed, 11 insertions(+)

    diff --git a/Documentation/memory-barriers.txt b/Documentation/memory-barriers.txt
    index d336e4d42029..8e7cf9ad3db1 100644
    --- a/Documentation/memory-barriers.txt
    +++ b/Documentation/memory-barriers.txt
    @@ -1710,6 +1710,17 @@ There are some more advanced barrier functions:
    operations" subsection for information on where to use these.


    + (*) lockless_dereference();
    + This can be thought of as a pointer-fetch wrapper around the
    + smp_read_barrier_depends() data-dependency barrier.
    +
    + This is also similar to rcu_dereference(), but in cases where
    + object lifetime is handled by some mechanism other than RCU, for
    + example, when the objects removed only when the system goes down.
    + In addition, lockless_dereference() is used in some data structures
    + that can be used both with and without RCU.
    +
    +
    (*) dma_wmb();
    (*) dma_rmb();

    --
    2.5.2


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