[GIT PULL rcu/next] RCU commits for 4.4

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

Hello, Ingo,

The changes in this series include the following:

1.	Miscellaneous fixes.  These were posted to LKML at
	https://lkml.org/lkml/2015/10/6/496.

2.	Improvements to expedited grace periods.  These were posted to
	LKML at https://lkml.org/lkml/2015/10/6/541.

3.	Documentation updates.  These were posted to LKML at
	https://lkml.org/lkml/2015/10/6/560.

4.	Performance improvements to and locktorture tests for percpu-rwsem.
	These were posted to LKML at https://lkml.org/lkml/2015/10/6/576.

5.	Torture-test changes.  These were posted to LKML at
	https://lkml.org/lkml/2015/10/6/590.

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 39cd2dd39a8b92ce91c4dad95f6e979c946a3942:

  Merge branches 'doc.2015.10.06a', 'percpu-rwsem.2015.10.06a' and 'torture.2015.10.06a' into HEAD (2015-10-07 16:06:25 -0700)

----------------------------------------------------------------
Boqun Feng (3):
      rcu: Use rcu_callback_t in call_rcu*() and friends
      rcu: Use call_rcu_func_t to replace explicit type equivalents
      rcu: Don't disable preemption for Tiny and Tree RCU readers

Davidlohr Bueso (2):
      sched: Export sched_setscheduler_nocheck
      locktorture: Support rtmutex torturing

Jason A. Donenfeld (1):
      documentation: Correct doc to use rcu_dereference_protected

Oleg Nesterov (9):
      rcu: Create rcu_sync infrastructure
      rcu_sync: Simplify rcu_sync using new rcu_sync_ops structure
      rcu_sync: Add CONFIG_PROVE_RCU checks
      rcu_sync: Introduce rcu_sync_dtor()
      locking/percpu-rwsem: Make percpu_free_rwsem() after kzalloc() safe
      locking/percpu-rwsem: Make use of the rcu_sync infrastructure
      locking/percpu-rwsem: Fix the comments outdated by rcu_sync
      locking/percpu-rwsem: Clean up the lockdep annotations in percpu_down_read()
      rcu_sync: Cleanup the CONFIG_PROVE_RCU checks

Patrick Marlier (1):
      rculist: Make list_entry_rcu() use lockless_dereference()

Paul E. McKenney (38):
      rcu: Use rsp->expedited_wq instead of sync_rcu_preempt_exp_wq
      rcu: Move rcu_report_exp_rnp() to allow consolidation
      rcu: Consolidate tree setup for synchronize_rcu_expedited()
      rcu: Use single-stage IPI algorithm for RCU expedited grace period
      rcu: Move synchronize_sched_expedited() to combining tree
      rcu: Rename qs_pending to core_needs_qs
      rcu: Invert passed_quiesce and rename to cpu_no_qs
      rcu: Make ->cpu_no_qs be a union for aggregate OR
      rcu: Eliminate panic when silly boot-time fanout specified
      rcu: Add online/offline info to stall warning message
      rcu: Move preemption disabling out of __srcu_read_lock()
      rcu: Correct comment for values of ->gp_state field
      rcu: Add rcu_pointer_handoff()
      rcu: Remove deprecated rcu_lockdep_assert()
      rculist: Use WRITE_ONCE() when deleting from reader-visible list
      documentation: No acquire/release for RCU readers
      documentation: Call out slow consoles as cause of stall warnings
      documentation: Catch up list of torture_type options
      documentation: Add lockless_dereference()
      locking/percpu-rwsem: Export symbols for locktorture
      locktorture: Add torture tests for percpu_rwsem
      torture: Consolidate cond_resched_rcu_qs() into stutter_wait()
      rcutorture: Fix module unwind when bad torture_type specified
      rcutorture: Fix unused-function warning for torturing_tasks()
      torture: Forgive non-plural arguments
      locktorture: Fix module unwind when bad torture_type specified
      rcu: Switch synchronize_sched_expedited() to IPI
      rcu: Stop silencing lockdep false positive for expedited grace periods
      rcu: Stop excluding CPU hotplug in synchronize_sched_expedited()
      cpu: Remove try_get_online_cpus()
      rcu: Prepare for consolidating expedited CPU selection
      rcu: Consolidate expedited CPU selection
      rcu: Add online/offline info to expedited stall warning message
      rcu: Add tasks to expedited stall-warning messages
      rcu: Enable stall warnings for synchronize_rcu_expedited()
      rcu: Better hotplug handling for synchronize_sched_expedited()
      Merge branches 'fixes.2015.10.06a' and 'exp.2015.10.07a' into HEAD
      Merge branches 'doc.2015.10.06a', 'percpu-rwsem.2015.10.06a' and 'torture.2015.10.06a' into HEAD

Petr Mladek (1):
      rcu: Finish folding ->fqs_state into ->gp_state

 Documentation/RCU/stallwarn.txt                    |   7 +
 Documentation/RCU/torture.txt                      |  39 +-
 Documentation/RCU/trace.txt                        |  32 +-
 Documentation/RCU/whatisRCU.txt                    |   6 +-
 Documentation/kernel-parameters.txt                |   9 +-
 Documentation/locking/locktorture.txt              |   3 +
 Documentation/memory-barriers.txt                  |  12 +-
 include/linux/cpu.h                                |   2 -
 include/linux/list.h                               |   5 +-
 include/linux/list_bl.h                            |   5 +-
 include/linux/list_nulls.h                         |   3 +-
 include/linux/percpu-rwsem.h                       |   3 +-
 include/linux/rcu_sync.h                           |  86 ++++
 include/linux/rculist.h                            |   5 +-
 include/linux/rcupdate.h                           |  59 +--
 include/linux/rcutiny.h                            |   3 +-
 include/linux/rcutree.h                            |   2 +-
 include/linux/sched.h                              |  10 +-
 include/linux/srcu.h                               |   5 +-
 kernel/cpu.c                                       |  13 -
 kernel/exit.c                                      |   2 +
 kernel/locking/locktorture.c                       | 164 ++++++-
 kernel/locking/percpu-rwsem.c                      |  90 ++--
 kernel/rcu/Makefile                                |   2 +-
 kernel/rcu/rcutorture.c                            |  16 +-
 kernel/rcu/srcu.c                                  |   4 +-
 kernel/rcu/sync.c                                  | 223 +++++++++
 kernel/rcu/tiny.c                                  |   8 +-
 kernel/rcu/tree.c                                  | 512 ++++++++++++++++-----
 kernel/rcu/tree.h                                  |  69 ++-
 kernel/rcu/tree_plugin.h                           | 437 ++++++++++--------
 kernel/rcu/tree_trace.c                            |  10 +-
 kernel/rcu/update.c                                |   2 +-
 kernel/sched/core.c                                |   1 +
 kernel/torture.c                                   |   1 +
 tools/testing/selftests/rcutorture/bin/kvm.sh      |   6 +-
 .../selftests/rcutorture/configs/lock/CFLIST       |   4 +-
 .../selftests/rcutorture/configs/lock/LOCK05       |   6 +
 .../selftests/rcutorture/configs/lock/LOCK05.boot  |   1 +
 .../selftests/rcutorture/configs/lock/LOCK06       |   6 +
 .../selftests/rcutorture/configs/lock/LOCK06.boot  |   1 +
 41 files changed, 1331 insertions(+), 543 deletions(-)
 create mode 100644 include/linux/rcu_sync.h
 create mode 100644 kernel/rcu/sync.c
 create mode 100644 tools/testing/selftests/rcutorture/configs/lock/LOCK05
 create mode 100644 tools/testing/selftests/rcutorture/configs/lock/LOCK05.boot
 create mode 100644 tools/testing/selftests/rcutorture/configs/lock/LOCK06
 create mode 100644 tools/testing/selftests/rcutorture/configs/lock/LOCK06.boot