linux-kernel - [PATCH tip/core/rcu 0/2] Enforce RCU grace-period transitivity

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Date:	Fri, 4 Dec 2015 15:41:25 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...nel.org, jiangshanlai@...il.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
	rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
	dvhart@...ux.intel.com, fweisbec@...il.com, oleg@...hat.com,
	bobby.prani@...il.com
Subject: [PATCH tip/core/rcu 0/2] Enforce RCU grace-period transitivity

Hello!

Within RCU, acquisitions of the rcu_node structure's ->lock field must
be followed by smp_mb__after_unlock_lock() in order to enforce RCU's
grace-period memory-ordering guarantees.  In theory, acquisitions for
debug purposes need not have smp_mb__after_unlock_lock(), but in practice,
anything other than fully consistent enforcement of this rule is a recipe
for disaster.  This series therefore adds smp_mb__after_unlock_lock()
for consistency:

1.	Create wrapper functions to minimize the number of these
	smp_mb__after_unlock_lock() calls, and apply these wrapper
	functions throughout.  Courtesy of Peter Zijlstra.

2.	Catch up wrapper-function application to patches that were
	in flight at the time #1 was created.

							Thanx, Paul

------------------------------------------------------------------------

 b/kernel/rcu/tree.c        |  102 ++++++++++++++++-----------------------------
 b/kernel/rcu/tree.h        |   39 +++++++++++++++++
 b/kernel/rcu/tree_plugin.h |   20 +++-----
 b/kernel/rcu/tree_trace.c  |    2 
 4 files changed, 85 insertions(+), 78 deletions(-)

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