Re: [GIT PULL rcu/next] RCU commits for 3.20

[Ingo Molnar <mingo@kernel.org>]

* Paul E. McKenney <paulmck@linux.vnet.ibm.com> wrote:

> Hello, Ingo,
> 
> The changes in this series include:
> 
> 1.	Documentation updates.  These were posted to LKML at
> 	https://lkml.org/lkml/2015/1/7/496.
> 
> 2.	Miscellaneous fixes.  These were posted to LKML at
> 	https://lkml.org/lkml/2015/1/7/507.
> 
> 3.	Preemptible-RCU fixes, including fixing an old bug in the
> 	interaction of RCU priority boosting and CPU hotplug.  These were
> 	posted to LKML at https://lkml.org/lkml/2015/1/7/535.
> 
> 4.	SRCU updates.  These were posted to LKML at
> 	https://lkml.org/lkml/2015/1/7/555.
> 
> 5.	RCU CPU stall-warning updates.  These were posted to LKML at
> 	https://lkml.org/lkml/2015/1/7/565.
> 
> 6.	RCU torture-test updates.  These were posted to LKML at
> 	https://lkml.org/lkml/2015/1/7/591.
> 
> These changes 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 78e691f4ae2d5edea0199ca802bb505b9cdced88:
> 
>   Merge branches 'doc.2015.01.07a', 'fixes.2015.01.15a', 'preempt.2015.01.06a', 'srcu.2015.01.06a', 'stall.2015.01.16a' and 'torture.2015.01.11a' into HEAD (2015-01-15 23:34:34 -0800)
> 
> ----------------------------------------------------------------
> 
> Alexander Gordeev (1):
>       rcu: Remove redundant rcu_is_cpu_rrupt_from_idle() from tiny RCU
> 
> Calvin Owens (1):
>       ksoftirqd: Enable IRQs and call cond_resched() before poking RCU
> 
> David Hildenbrand (1):
>       hotplugcpu: Avoid deadlocks by waking active_writer
> 
> Davidlohr Bueso (1):
>       documentation: Fix smp typo in memory-barriers.txt
> 
> Lai Jiangshan (3):
>       tiny_rcu: Directly force QS when call_rcu_[bh|sched]() on idle_task
>       rcu: Remove "select IRQ_WORK" from config TREE_RCU
>       rcu: Revert "Allow post-unlock reference for rt_mutex" to avoid priority-inversion
> 
> Miroslav Benes (1):
>       rcu: Fix RCU CPU stall detection in tiny implementation
> 
> Paul E. McKenney (43):
>       rcu: Make rcu_nmi_enter() handle nesting
>       rcu: Fix invoke_rcu_callbacks() comment
>       compiler: Allow 1- and 2-byte smp_load_acquire() and smp_store_release()
>       rcu: Fix rcu_barrier() race that could result in too-short wait
>       rcu: Protect rcu_boost() lockless accesses with ACCESS_ONCE()
>       rcu: Rename "empty" to "empty_norm" in preparation for boost rework
>       rcu: Abstract rcu_cleanup_dead_rnp() from rcu_cleanup_dead_cpu()
>       rcu: Make rcu_read_unlock_special() propagate ->qsmaskinit bit clearing
>       rcu: Don't migrate blocked tasks even if all corresponding CPUs offline
>       rcu: Shorten irq-disable region in rcu_cleanup_dead_cpu()
>       rcu: Make use of rcu_preempt_has_tasks()
>       rcu: Don't spawn rcub kthreads on root rcu_node structure
>       rcu: Don't initiate RCU priority boosting on root rcu_node
>       rcu: Don't bother affinitying rcub kthreads away from offline CPUs
>       rcu: Note quiescent state when CPU goes offline
>       rcu: Don't scan root rcu_node structure for stalled tasks
>       rcu: Remove redundant callback-list initialization
>       rcu: Expand SRCU ->completed to 64 bits
>       rcu: Combine DEFINE_SRCU() and DEFINE_STATIC_SRCU()
>       rcu: Set default to RCU_CPU_STALL_INFO=y
>       rcutorture: Add checks for stall ending before dump start
>       rcu: Make RCU_CPU_STALL_INFO include number of fqs attempts
>       rcu: Improve diagnostics for spurious RCU CPU stall warnings
>       rcu: Handle gpnum/completed wrap while dyntick idle
>       documentation: Record limitations of bitfields and small variables
>       rcutorture: Issue warnings on close calls due to Reader Batch blows
>       rcu: Make _batches_completed() functions return unsigned long
>       rcutorture: Make build-output parsing correctly flag RCU's warnings
>       rcutorture: Use unsigned for Reader Batch computations
>       rcu: Provide rcu_batches_completed_sched() for TINY_RCU
>       rcutorture: Drop rcu_torture_completed() and friends
>       rcu: Remove redundant rcu_batches_completed() declaration
>       rcutorture: Check from beginning to end of grace period
>       rcutorture: Handle different mpstat versions
>       torture: Add "-enable-kvm -soundhw pcspk" to qemu command line
>       torture: Flag console.log file to prevent holdovers from earlier runs
>       rcutorture: Add more diagnostics in rcu_barrier() test failure case
>       ksoftirqd: Use new cond_resched_rcu_qs() function
>       rcu: Optionally run grace-period kthreads at real-time priority
>       rcu: Make cond_resched_rcu_qs() apply to normal RCU flavors
>       rcu: Add GP-kthread-starvation checks to CPU stall warnings
>       rcu: Initialize tiny RCU stall-warning timeouts at boot
>       Merge branches 'doc.2015.01.07a', 'fixes.2015.01.15a', 'preempt.2015.01.06a', 'srcu.2015.01.06a', 'stall.2015.01.16a' and 'torture.2015.01.11a' into HEAD
> 
> Pranith Kumar (2):
>       rcupdate: Replace smp_read_barrier_depends() with lockless_dereference()
>       rcu: Make SRCU optional by using CONFIG_SRCU
> 
> Xie XiuQi (1):
>       documentation: Update sysfs path for rcu_cpu_stall_timeout
> 
> Ying Xue (1):
>       rculist: Fix sparse warning
> 
>  Documentation/RCU/stallwarn.txt                    |  16 +-
>  Documentation/RCU/trace.txt                        |  32 +-
>  Documentation/memory-barriers.txt                  |  46 ++-
>  arch/arm/kvm/Kconfig                               |   1 +
>  arch/arm64/kvm/Kconfig                             |   1 +
>  arch/mips/kvm/Kconfig                              |   1 +
>  arch/powerpc/kvm/Kconfig                           |   1 +
>  arch/s390/kvm/Kconfig                              |   1 +
>  arch/tile/kvm/Kconfig                              |   1 +
>  arch/x86/Kconfig                                   |   1 +
>  arch/x86/kvm/Kconfig                               |   1 +
>  drivers/clk/Kconfig                                |   1 +
>  drivers/cpufreq/Kconfig                            |   1 +
>  drivers/devfreq/Kconfig                            |   1 +
>  drivers/md/Kconfig                                 |   1 +
>  drivers/net/Kconfig                                |   1 +
>  fs/btrfs/Kconfig                                   |   1 +
>  fs/notify/Kconfig                                  |   1 +
>  fs/quota/Kconfig                                   |   1 +
>  include/linux/compiler.h                           |   2 +-
>  include/linux/rculist.h                            |  16 +-
>  include/linux/rcupdate.h                           |  13 +-
>  include/linux/rcutiny.h                            |  45 ++-
>  include/linux/rcutree.h                            |  11 +-
>  include/linux/srcu.h                               |  14 +-
>  init/Kconfig                                       |  18 +-
>  kernel/cpu.c                                       |  56 ++--
>  kernel/notifier.c                                  |   3 +
>  kernel/power/Kconfig                               |   1 +
>  kernel/rcu/Makefile                                |   3 +-
>  kernel/rcu/rcu.h                                   |   6 +
>  kernel/rcu/rcutorture.c                            |  66 ++--
>  kernel/rcu/srcu.c                                  |   2 +-
>  kernel/rcu/tiny.c                                  | 113 +------
>  kernel/rcu/tiny_plugin.h                           |   9 +-
>  kernel/rcu/tree.c                                  | 355 +++++++++++++++------
>  kernel/rcu/tree.h                                  |  62 +---
>  kernel/rcu/tree_plugin.h                           | 271 +++++-----------
>  kernel/rcu/tree_trace.c                            |   8 +-
>  kernel/softirq.c                                   |   3 +-
>  lib/Kconfig.debug                                  |   3 +-
>  mm/Kconfig                                         |   1 +
>  security/tomoyo/Kconfig                            |   1 +
>  tools/testing/selftests/rcutorture/bin/cpus2use.sh |   2 +-
>  .../selftests/rcutorture/bin/kvm-recheck-rcu.sh    |  18 ++
>  .../selftests/rcutorture/bin/kvm-test-1-run.sh     |   9 +-
>  .../selftests/rcutorture/bin/parse-build.sh        |  20 +-
>  .../selftests/rcutorture/bin/parse-console.sh      |   2 +-
>  48 files changed, 657 insertions(+), 586 deletions(-)

Pulled, thanks a lot Paul!

	Ingo