tree 8a22478ccd00541a79a16ad7045b607639d4da09
parent a4b575627e8d1a2498a921940813266d4e26ff56
author Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1444665105 -0700
committer Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1449347617 -0800

documentation: Clarify RCU memory barriers and requirements

The RCU requirements do not make it absolutely clear that the
memory-barrier requirements are not intended to replace the fundamental
requirement that all pre-existing RCU readers complete before a grace
period completes.  This commit therefore pulls the memory-barrier
requirements into a separate section and explicitly calls out the
relationship between the memory-barrier requirements and the fundamental
requirement.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>