[GIT PULL rcu/next] RCU commits for 4.9

[Paul E. McKenney]

Hello, Ingo,

This series contains the following changes:

1.	Documentation updates, again just some simple changes.
	Yes, I am getting behind on design-level updates.  :-/

	http://lkml.kernel.org/g/20160822151413.GA6337@xxxxxxxxxxxxxxxxxx

2.	Expedited grace-period changes, most notably avoiding having
	user threads drive expedited grace periods, using a workqueue
	instead.

	http://lkml.kernel.org/g/20160822152239.GA7153@xxxxxxxxxxxxxxxxxx

3.	Miscellaneous fixes, including a performance fix for lists
	that was sent with the lists modifications (second URL below).
	I am holding the lists debug-enhancement modifications for the
	next merge window, as there doesn't seem to be much energy
	around providing fixes, and I cannot supply that energy for
	this merge window.  (I will make time as needed during the next
	merge window.)

	http://lkml.kernel.org/g/20160822152956.GA8160@xxxxxxxxxxxxxxxxxx
	http://lkml.kernel.org/g/20160822154501.GA10364@xxxxxxxxxxxxxxxxxx

4.	CPU hotplug updates, most notably providing exact CPU-online
	tracking for RCU.  This will in turn allow removal of the
	checks supporting RCU's prior heuristic that was based on the
	assumption that CPUs would take no longer than one jiffy to
	come online.

	http://lkml.kernel.org/g/20160822153825.GA9242@xxxxxxxxxxxxxxxxxx

5.	Torture-test updates.

	http://lkml.kernel.org/g/20160822155423.GA11367@xxxxxxxxxxxxxxxxxx

All of these changes have been subjected to 0day Test Robot and -next
testing, and are available in the git repository at:

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

for you to fetch changes up to d74b62bc3241af8ebf5141f5b12e89d9d7f341e1:

  Merge branches 'doc.2016.08.22c', 'exp.2016.08.22c', 'fixes.2016.09.14a', 'hotplug.2016.08.22c' and 'torture.2016.08.22c' into HEAD (2016-09-14 12:58:49 -0700)

----------------------------------------------------------------
Chris Wilson (1):
      list: Expand list_first_entry_or_null()

Ding Tianhong (1):
      rcu: Fix soft lockup for rcu_nocb_kthread

Jisheng Zhang (1):
      rcu: Use rcu_gp_kthread_wake() to wake up grace period kthreads

Paul E. McKenney (13):
      documentation: Record reason for rcu_head two-byte alignment
      rcu: Consolidate expedited grace period machinery
      rcu: Drive expedited grace periods from workqueue
      rcu: Stop disabling expedited RCU CPU stall warnings
      rcu: Make expedited RCU CPU stall warnings respond to controls
      rcu: Exclude RCU-offline CPUs from expedited grace periods
      rcu: Use RCU's online-CPU state for expedited IPI retry
      sched: Make wake_up_nohz_cpu() handle CPUs going offline
      rcu: Avoid redundant quiescent-state chasing
      rcu: Provide exact CPU-online tracking for RCU
      torture: Convert torture_shutdown() to hrtimer
      torture: Add task state to writer-task stall printk()s
      Merge branches 'doc.2016.08.22c', 'exp.2016.08.22c', 'fixes.2016.09.14a', 'hotplug.2016.08.22c' and 'torture.2016.08.22c' into HEAD

Paul Gortmaker (1):
      rcu: Don't use modular infrastructure in non-modular code

Sebastian Andrzej Siewior (2):
      cpu/hotplug: Get rid of CPU_STARTING reference
      rcutorture: Convert to hotplug state machine

SeongJae Park (4):
      rcutorture: Remove outdated config option description
      rcutorture: Print out barrier error as document says
      rcuperf: Consistently insert space between flag and message
      torture: TOROUT_STRING(): Insert a space between flag and message

 .../RCU/Design/Requirements/Requirements.html      |  22 ++++
 Documentation/RCU/torture.txt                      |  15 ---
 include/linux/list.h                               |   7 +-
 include/linux/rcupdate.h                           |   1 +
 include/linux/torture.h                            |   2 +-
 kernel/cpu.c                                       |   1 +
 kernel/rcu/rcuperf.c                               |   7 +-
 kernel/rcu/rcutorture.c                            |  62 ++++-------
 kernel/rcu/tree.c                                  |  44 ++++++--
 kernel/rcu/tree.h                                  |   1 +
 kernel/rcu/tree_exp.h                              | 124 +++++++++++++--------
 kernel/rcu/tree_plugin.h                           |   1 +
 kernel/rcu/tree_trace.c                            |   7 +-
 kernel/rcu/update.c                                |   3 +-
 kernel/sched/core.c                                |   7 ++
 kernel/torture.c                                   |  27 +++--
 16 files changed, 193 insertions(+), 138 deletions(-)