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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 <boqun.feng@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
hifive-unleashed-5.1
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
(*) 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: