documentation: Update circular buffer for load-acquire/store-release

This commit replaces full barriers by targeted use of load-acquire and
store-release.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
[ paulmck: Restore comments as suggested by David Howells. ]
This commit is contained in:
Paul E. McKenney 2013-11-04 11:20:56 -08:00
commit 6c43c091bd