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Subject[PATCH v2 1/9] doc: memory-barriers.txt: Document use of lockless_dereference()
Recently lockless_dereference() was added which can be used in place of
hard-coding smp_read_barrier_depends(). The following PATCH makes the change.

Signed-off-by: Pranith Kumar <>
Documentation/memory-barriers.txt | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/memory-barriers.txt b/Documentation/memory-barriers.txt
index 7ee2ae6..d33aab3 100644
--- a/Documentation/memory-barriers.txt
+++ b/Documentation/memory-barriers.txt
@@ -203,8 +203,8 @@ There are some minimal guarantees that may be expected of a CPU:
and always in that order. On most systems, smp_read_barrier_depends()
does nothing, but it is required for DEC Alpha. The ACCESS_ONCE()
is required to prevent compiler mischief. Please note that you
- should normally use something like rcu_dereference() instead of
- open-coding smp_read_barrier_depends().
+ should normally use something like rcu_dereference() or
+ lockless_dereference() instead of open-coding smp_read_barrier_depends().

(*) Overlapping loads and stores within a particular CPU will appear to be
ordered within that CPU. This means that for:

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