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Date:	Tue,  6 Oct 2015 09:34:18 -0700
From:	"Paul E. McKenney" <>
	"Paul E. McKenney" <>
Subject: [PATCH tip/core/rcu 1/5] documentation: No acquire/release for RCU readers

Documentation/memory-barriers.txt calls out RCU as one of the sets
of primitives associated with ACQUIRE and RELEASE.  There really
is an association in that rcu_assign_pointer() includes a RELEASE
operation, but a quick read can convince people that rcu_read_lock() and
rcu_read_unlock() have ACQUIRE and RELEASE semantics, which they do not.

This commit therefore removes RCU from this list in order to avoid
this confusion.

Reported-by: Boqun Feng <>
Signed-off-by: Paul E. McKenney <>
 Documentation/memory-barriers.txt | 1 -
 1 file changed, 1 deletion(-)

diff --git a/Documentation/memory-barriers.txt b/Documentation/memory-barriers.txt
index 2ba8461b0631..d336e4d42029 100644
--- a/Documentation/memory-barriers.txt
+++ b/Documentation/memory-barriers.txt
@@ -1789,7 +1789,6 @@ The Linux kernel has a number of locking constructs:
  (*) mutexes
  (*) semaphores
  (*) R/W semaphores
- (*) RCU
 In all cases there are variants on "ACQUIRE" operations and "RELEASE" operations
 for each construct.  These operations all imply certain barriers:

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