[PATCH tip/core/rcu 0/14] Preemptible-RCU updates for 3.20

[Paul E. McKenney]

Hello!

This series fixes some problems in preemptible RCU.

1.	Protect rcu_boost() lockless accesses with ACCESS_ONCE().

2-11.	Fix a low-probability long-standing bug in preemptible RCU that
	could occur in systems with more than 16 CPUs, but only if a full
	bank of 16 CPUs (as in 0-15, 16-31, 32-47, ...) was taken offline.
	See http://paulmck.livejournal.com/37782.html for more details.

12.	Revert old commit that worked around an rt_mutex bug.  This old
	commit could cause priority inversion, and the rt_mutex bug has
	long since been fixed.  Courtesy of Lai Jiangshan.

13.	Simplify grace-period code, enabled by 2-11 above.

14.	Remove redundant RCU callback list initialization.

							Thanx, Paul

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

 b/kernel/rcu/tree.c        |  115 +++++++++++++-------------
 b/kernel/rcu/tree.h        |   24 -----
 b/kernel/rcu/tree_plugin.h |  196 ++++++++++-----------------------------------
 3 files changed, 102 insertions(+), 233 deletions(-)

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