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documentation: No acquire/release for RCU readers

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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 <boqun.feng@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
This commit is contained in:
Paul E. McKenney 2015-08-01 10:45:26 -07:00
parent 19a5ecde08
commit 27566139b6
1 changed files with 0 additions and 1 deletions
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Documentation/memory-barriers.txt
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@ -1789,7 +1789,6 @@ The Linux kernel has a number of locking constructs:
(*) mutexes (*) mutexes
(*) semaphores (*) semaphores
(*) R/W semaphores (*) R/W semaphores
(*) RCU
In all cases there are variants on "ACQUIRE" operations and "RELEASE" operations In all cases there are variants on "ACQUIRE" operations and "RELEASE" operations
for each construct. These operations all imply certain barriers: for each construct. These operations all imply certain barriers: