[PATCH tip/core/rcu 0/7] Preview of fourth set of RCU changes for 3.3

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

Hello!

This patchset adds to the earlier sets:

	https://lkml.org/lkml/2011/11/2/363
	https://lkml.org/lkml/2011/11/15/302
	https://lkml.org/lkml/2011/11/28/588

This fourth set adds more infrastructure for Frederic's user-mode nohz
work, additional improvements to RCU_FAST_NO_HZ, and a few bug fixes.
The patches are as follows:

1,2.	More support for user-mode nohz (courtesy of Frederic Weisbecker).
3.	Ignore RCU callback batch limits if the CPU is otherwise idle.
	This allows a CPU to more quickly clear a backlog of callbacks,
	and thus more quickly enter dyntick-idle mode.
4.	Adaptive dyntick-entry approach that more efficiently handles
	the various possible grace-period begin/end scenarios.
5.	Remove a redundant variable declaration.
6.	Allow rcutorture to avoid attempting to offline unhotpluggable CPUs.
7.	Fix RCU-lockdep splats involving RCU read-side critical sections
	that partially overlap irq-disable code sections (courtesy of
	Yong Zhang).

For a testing-only version of this patchset from git, please see the
following subject-to-rebase branch, based on 3.2-rc3:

git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/dev

							Thanx, Paul

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

 b/drivers/base/cpu.c      |   12 ++++++++
 b/include/linux/cpu.h     |    1 
 b/kernel/rcutorture.c     |    4 +-
 b/kernel/rcutree.c        |   18 +++++--------
 b/kernel/rcutree.h        |    1 
 b/kernel/rcutree_plugin.h |   14 ++++++++++
 kernel/rcutree.c          |   12 ++++----
 kernel/rcutree_plugin.h   |   62 ++++++++++++++++++++++++++++++++++++----------
 8 files changed, 92 insertions(+), 32 deletions(-)