Messages in this thread Patch in this message | | | From | "Paul E. McKenney" <> | Subject | [PATCH tip/core/rcu 5/5] documentation: Add lockless_dereference() | Date | Tue, 6 Oct 2015 09:34:22 -0700 |
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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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