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documentation: Add lockless_dereference()
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> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
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@ -1710,6 +1710,17 @@ There are some more advanced barrier functions:
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operations" subsection for information on where to use these.
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(*) lockless_dereference();
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This can be thought of as a pointer-fetch wrapper around the
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smp_read_barrier_depends() data-dependency barrier.
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This is also similar to rcu_dereference(), but in cases where
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object lifetime is handled by some mechanism other than RCU, for
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example, when the objects removed only when the system goes down.
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In addition, lockless_dereference() is used in some data structures
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that can be used both with and without RCU.
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(*) dma_wmb();
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(*) dma_rmb();
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