[PATCH RFC tip/core/rcu 0/5] Consolidate RCU dyntick-idle counter manipulation

["Paul E. McKenney" <paulmck@linux.vnet.ibm.com>]

Hello!

The first four patches of this series consolidate RCU's dyntick-idle
counter manipulations into a set of access functions.  These are currently
queued for 4.12 (merge window after next).  The last patch in this series
uses the bottom bit of RCU's dyntick-idle counter to track a CPU's state,
and has been proposed to track the need to flush the local CPU's TLB.
This last patch will not be pushed until it has a use.

The patches are as follows:

1.	Abstract the dynticks momentary-idle operation.

2.	Abstract the dynticks snapshot operation.

3.	Abstract dynticks extended quiescent state enter/exit operations.

4.	Abstract extended quiescent state determination.

5.	Maintain special bits at bottom of ->dynticks counter, which
	might be used to track a given CPU's need to flush TLBs.

							Thanx, Paul

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

 include/linux/rcutiny.h  |   11 +
 kernel/rcu/tree.c        |  263 ++++++++++++++++++++++++++++++++++-------------
 kernel/rcu/tree.h        |    3 
 kernel/rcu/tree_exp.h    |   12 --
 kernel/rcu/tree_plugin.h |    2 
 kernel/rcu/tree_trace.c  |    2 
 6 files changed, 216 insertions(+), 77 deletions(-)