[GIT PULL rcu/next] RCU commits for 3.16

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

Hello, Ingo,

The changes in this series include:

1.	Update RCU documentation.  These were posted to LKML at
	https://lkml.org/lkml/2014/4/28/634.

2.	Miscellaneous fixes.  These were posted to LKML at
	https://lkml.org/lkml/2014/4/28/645.

3.	Torture-test changes.  These were posted to LKML at
	https://lkml.org/lkml/2014/4/28/667.

4.	Variable-name renaming cleanup, sent separately due to conflicts.
	This was posted to LKML at https://lkml.org/lkml/2014/5/13/854.

5.	Patch to suppress RCU stall warnings while sysrq requests are
	being processed.  This patch is the RCU portions of the patch
	that Rik posted to LKML at https://lkml.org/lkml/2014/4/29/457.
	The reason for pushing this patch ahead instead of waiting until
	3.17 is that the NMI-based stack traces are messing up sysrq
	output, and in some cases also messing up the system as well.

All of these have been exposed to -next testing.
These changes are available in the git repository at:

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

for you to fetch changes up to 61f38db3e3c0e4c3be0858750e2cabeadaecac0c:

  rcu: Provide API to suppress stall warnings while sysrc runs (2014-05-19 10:52:04 -0700)

							Thanx, Paul

----------------------------------------------------------------
Andreea-Cristina Bernat (3):
      rcu: Add event tracing to dyntick_save_progress_counter().
      rcu: Consolidate kfree_call_rcu() to use rcu_state pointer
      rcu: Merge rcu_sched_force_quiescent_state() with rcu_force_quiescent_state()

Christoph Lameter (1):
      rcu: Replace __this_cpu_ptr() uses with raw_cpu_ptr()

Eric Dumazet (1):
      softirq: A single rcu_bh_qs() call per softirq set is enough

Himangi Saraogi (2):
      rcu: Protect uses of ->jiffies_stall with ACCESS_ONCE()
      rcu: Replace NR_CPUS with nr_cpu_ids

Iulia Manda (4):
      rcu: Remove unused rcu_data structure field
      rcu: Protect uses of jiffies_stall field with ACCESS_ONCE()
      rcu: Remove "extern" from function declaration in include/linux/rcupdate.h
      torture: Notice if an all-zero cpumask is passed inside a critical section

Liu Ping Fan (1):
      rcu: Fix incorrect notes for code

Paul E. McKenney (50):
      documentation: Update sysfs path for rcu_cpu_stall_suppress
      documentation: Record rcu_dereference() value mishandling
      documentation: Update API documentation
      rcu: Protect ->gp_flags accesses with ACCESS_ONCE()
      rcu: Print negatives for stall-warning counter wraparound
      rcu: Update cpu_needs_another_gp() for futures from non-NOCB CPUs
      rcu: Make callers awaken grace-period kthread
      rcu: Document RCU_INIT_POINTER()'s lack of ordering guarantees
      rcu: Bind RCU grace-period kthreads if NO_HZ_FULL
      rcu: Make large and small sysidle systems use same state machine
      rcutorture: Add forward-progress checking for writer
      torture: Remove obsolete builddir options
      torture: Add batch headers "--dryrun sched"
      torture: Make parse-rcutorture.sh less RCU-specific
      torture: Rename RCU_INITRD to TORTURE_INITRD
      torture: Intensify locking test
      torture: Allow variations of "defconfig" to be specified
      torture: Rename RCU_KMAKE_ARG to TORTURE_KMAKE_ARG
      torture: Rename RCU_BOOTARGS to TORTURE_BOOTARGS
      torture: Rename RCU_BUILDONLY to TORTURE_BUILDONLY
      torture: Rename RCU_QEMU_INTERACTIVE to TORTURE_QEMU_INTERACTIVE
      torture: Rename RCU_QEMU_MAC to TORTURE_QEMU_MAC
      torture: Rename RCU_QEMU_ARG to TORTURE_QEMU_ARG
      torture: Rename RCU_QEMU_CMD to TORTURE_QEMU_CMD
      torture: Make config-fragment filtering RCU-independent
      torture: Make "--dryrun script" output self-sufficient
      torture: Make "--dryrun script" use same environment as normal run
      rcutorture: Print negatives for SRCU counter wraparound
      torture: Include "Stopping" string to torture_kthread_stopping()
      torture: Report diagnostics from qemu
      torture: Increase stutter-end intensity
      torture: Permit multi-word qemu and boot arguments
      torture: Choose bzImage location based on architecture
      torture: Add tracing-enabled variant of TREE02
      torture: Dump ftrace buffer when the RCU grace period stalls
      rcutorture: Export RCU grace-period kthread wait state to rcutorture
      percpu: Fix raw_cpu_inc_return()
      sched,rcu: Make cond_resched() report RCU quiescent states
      rcutorture: Make rcu_torture_reader() use cond_resched()
      torture: Better summary diagnostics for build failures
      rcutorture: Check for rcu_torture_fqs creation errors
      torture: Use elapsed time to detect hangs
      rcutorture: Test RCU-sched primitives in TREE_PREEMPT_RCU kernels
      rcutorture:  Add tests for get_state_synchronize_rcu()
      rcutorture: Explicitly test synchronous grace-period primitives
      rcutorture: Note diffs from git commits
      rcutorture: Run rcu_torture_writer at normal priority
      locktorture: Remove reference to nonexistent Kconfig parameter
      torture: Check for multiple concurrent torture tests
      Merge branches 'doc.2014.04.29a', 'fixes.2014.04.29a' and 'torture.2014.05.14a' into HEAD

Pranith Kumar (3):
      rcu: Remove duplicate resched_cpu() declaration
      torture: Remove __init from torture_init_begin/end
      torture: Remove unused definition

Rashika Kheria (1):
      rcutorture: Mark function as static in kernel/rcu/torture.c

Rik van Riel (1):
      rcu: Provide API to suppress stall warnings while sysrc runs

Thomas Gleixner (1):
      rcutorture: Add missing destroy_timer_on_stack()

Uma Sharma (1):
      rcu: Variable name changed in tree_plugin.h and used in tree.c

 Documentation/RCU/00-INDEX                         |   2 +
 Documentation/RCU/checklist.txt                    |  12 +-
 Documentation/RCU/rcu_dereference.txt              | 371 +++++++++++++++++++++
 Documentation/RCU/stallwarn.txt                    |   2 +-
 Documentation/RCU/whatisRCU.txt                    |  55 ++-
 include/linux/percpu.h                             |   2 +-
 include/linux/rcupdate.h                           |  72 +++-
 include/linux/rcutiny.h                            |   4 +
 include/linux/rcutree.h                            |   1 +
 include/linux/torture.h                            |   8 +-
 kernel/locking/locktorture.c                       |  10 +-
 kernel/rcu/rcutorture.c                            | 217 +++++++++---
 kernel/rcu/tiny_plugin.h                           |   8 +-
 kernel/rcu/tree.c                                  | 309 ++++++++++++-----
 kernel/rcu/tree.h                                  |  11 +-
 kernel/rcu/tree_plugin.h                           | 136 ++------
 kernel/rcu/update.c                                |  30 ++
 kernel/sched/core.c                                |   7 +-
 kernel/softirq.c                                   |   4 +-
 kernel/torture.c                                   |  40 ++-
 .../testing/selftests/rcutorture/bin/configinit.sh |   2 +-
 .../testing/selftests/rcutorture/bin/functions.sh  |  48 ++-
 .../testing/selftests/rcutorture/bin/kvm-build.sh  |   6 +-
 .../selftests/rcutorture/bin/kvm-recheck-lock.sh   |   2 +-
 .../selftests/rcutorture/bin/kvm-recheck-rcu.sh    |   2 +-
 .../selftests/rcutorture/bin/kvm-recheck.sh        |  24 +-
 .../selftests/rcutorture/bin/kvm-test-1-run.sh     |  47 ++-
 tools/testing/selftests/rcutorture/bin/kvm.sh      | 142 ++++----
 .../bin/{parse-rcutorture.sh => parse-torture.sh}  |  22 +-
 .../selftests/rcutorture/configs/rcu/TREE02-T      |  25 ++
 .../selftests/rcutorture/configs/rcu/TREE08.boot   |   1 +
 31 files changed, 1210 insertions(+), 412 deletions(-)
 create mode 100644 Documentation/RCU/rcu_dereference.txt
 rename tools/testing/selftests/rcutorture/bin/{parse-rcutorture.sh => parse-torture.sh} (79%)
 create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/TREE02-T
 create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/TREE08.boot