Re: [GIT PULL rcu/next] RCU commits for 4.5

[Ingo Molnar <mingo@kernel.org>]

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

> Hello, Ingo,
> 
> The changes in this series include the following:
> 
> 1.	Adding transitivity uniformly to rcu_node structure ->lock
> 	acquisitions.  (This is implemented by the first two commits
> 	on top of v4.4-rc2 due to the pervasive nature of this change.)
> 
> 	http://article.gmane.org/gmane.linux.kernel/2100835
> 
> 2.	Documentation updates, including RCU requirements.
> 
> 	http://article.gmane.org/gmane.linux.kernel/2104628
> 
> 3.	Expedited grace-period changes.
> 
> 	http://article.gmane.org/gmane.linux.kernel/2104595
> 
> 4.	Miscellaneous fixes.
> 
> 	http://article.gmane.org/gmane.linux.kernel/2104612
> 
> 5.	Linked-list fixes, courtesy of KTSAN.
> 
> 	http://article.gmane.org/gmane.linux.kernel/2100875
> 
> 6.	Torture-test updates.
> 
> 	http://article.gmane.org/gmane.linux.kernel/2104652
> 
> 7.	Late-breaking fix to sysrq-generated crash.
> 
> 	http://article.gmane.org/gmane.linux.kernel/2111676
> 
> 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 984cf355aeaa8f2eda3861b50d0e8d3e3f77e83b:
> 
>   sysrq: Fix warning in sysrq generated crash. (2015-12-29 16:29:18 -0800)
> 
> ----------------------------------------------------------------
> Alexey Kardashevskiy (2):
>       rcu: Fix comment for rcu_dereference_raw_notrace
>       list: Add lockless list traversal primitives
> 
> Ani Sinha (1):
>       sysrq: Fix warning in sysrq generated crash.
> 
> Chris Metcalf (1):
>       Documentation/memory-barriers.txt: Fix ACCESS_ONCE thinko
> 
> Paul E. McKenney (41):
>       list: Use WRITE_ONCE() when adding to lists and hlists
>       list: Use READ_ONCE() when testing for empty lists
>       rcu: Add transitivity to remaining rcu_node ->lock acquisitions
>       rcu: Short-circuit synchronize_sched_expedited() if only one CPU
>       rcu: Clarify role of ->expmaskinitnext
>       rcu: Move smp_mb() from rcu_seq_snap() to rcu_exp_gp_seq_snap()
>       rcu: Invert sync_rcu_exp_select_cpus() "if" statement
>       rcu: Reduce expedited GP memory contention via per-CPU variables
>       rcu: Make expedited grace periods resolve stall-warning ties
>       rcu: Add more diagnostics to expedited stall warning messages.
>       rcu: Add rcu_normal kernel parameter to suppress expediting
>       rcu: Wire up rcu_end_inkernel_boot()
>       rcu: Allow expedited grace periods to be disabled at init
>       rcu: Move lock_class_key to local scope
>       rcu: Simplify rcu_sched_qs() control flow
>       rcu: Remove lock-acquisition loop from rcu_read_unlock_special()
>       rcu: Fix obsolete rcu_bootup_announce_oddness() comment
>       rcu: Avoid tick_nohz_active checks on NOCBs CPUs
>       rcu: Stop disabling interrupts in scheduler fastpaths
>       list: Use WRITE_ONCE() when initializing list_head structures
>       documentation: Record RCU requirements
>       Documentation: Record bottom-bit-zero guarantee for ->next
>       documentation: Cover requirements controlling stall warnings
>       documentation: Composability analogies
>       documentation: Expand on scheduler/RCU deadlock requirements
>       documentation: Clarify RCU memory barriers and requirements
>       documentation: Update RCU requirements based on expedited changes
>       rcutorture: Add batch number to script printout
>       rcutorture: Flag nonexistent RCU GP kthread
>       rcutorture:  Dump stack when GP kthread stalls
>       rcutorture: Default grace period to three minutes, allow override
>       rcutorture: Print symbolic name for rcu_torture_writer_state
>       rcutorture: Print symbolic name for ->gp_state
>       torture: Abbreviate console error dump
>       torture: Place console.log files correctly from the get-go
>       rcu: Remove TINY_RCU bloat from pointless boot parameters
>       rcu: Eliminate unused rcu_init_one() argument
>       rcu: Make cpu_needs_another_gp() be bool
>       rcu: Don't redundantly disable irqs in rcu_irq_{enter,exit}()
>       rcu: Make rcu_gp_init() be bool rather than int
>       Merge branches 'doc.2015.12.05a', 'exp.2015.12.07a', 'fixes.2015.12.07a', 'list.2015.12.04b' and 'torture.2015.12.05a' into HEAD
> 
> Paul Gortmaker (1):
>       kernel: Make rcu/tree_trace.c explicitly non-modular
> 
> Peter Zijlstra (2):
>       rcu: Create transitive rnp->lock acquisition functions
>       rcu: Move wakeup out from under rnp->lock
> 
> Petko Manolov (1):
>       list: Introduces generic list_splice_tail_init_rcu()
> 
> Yang Shi (1):
>       rcutorture: Remove CONFIG_RCU_USER_QS from rcutorture selftest doc
> 
>  .../RCU/Design/Requirements/2013-08-is-it-dead.png |  Bin 0 -> 100825 bytes
>  .../Design/Requirements/GPpartitionReaders1.svg    |  374 +++
>  .../RCU/Design/Requirements/RCUApplicability.svg   |  237 ++
>  .../Design/Requirements/ReadersPartitionGP1.svg    |  639 +++++
>  .../RCU/Design/Requirements/Requirements.html      | 2897 ++++++++++++++++++++
>  .../RCU/Design/Requirements/Requirements.htmlx     | 2741 ++++++++++++++++++
>  Documentation/RCU/Design/htmlqqz.sh                |  108 +
>  Documentation/kernel-parameters.txt                |   29 +-
>  Documentation/memory-barriers.txt                  |    8 +-
>  drivers/tty/sysrq.c                                |    6 +
>  include/linux/list.h                               |   14 +-
>  include/linux/list_bl.h                            |    2 +-
>  include/linux/list_nulls.h                         |    2 +-
>  include/linux/rculist.h                            |  105 +-
>  include/linux/rcupdate.h                           |   21 +-
>  include/linux/rcutiny.h                            |    8 +
>  include/linux/rcutree.h                            |    4 +-
>  include/linux/tracepoint.h                         |    4 +-
>  init/main.c                                        |    2 +
>  kernel/ksysfs.c                                    |   26 +-
>  kernel/rcu/rcutorture.c                            |   24 +-
>  kernel/rcu/srcu.c                                  |    2 +-
>  kernel/rcu/tree.c                                  |  313 ++-
>  kernel/rcu/tree.h                                  |   61 +-
>  kernel/rcu/tree_plugin.h                           |   66 +-
>  kernel/rcu/tree_trace.c                            |   39 +-
>  kernel/rcu/update.c                                |   22 +-
>  kernel/sched/core.c                                |    6 +-
>  lib/list_debug.c                                   |    2 +-
>  .../selftests/rcutorture/bin/kvm-test-1-run.sh     |    9 +-
>  tools/testing/selftests/rcutorture/bin/kvm.sh      |   22 +-
>  .../selftests/rcutorture/bin/parse-console.sh      |   41 +-
>  .../testing/selftests/rcutorture/doc/TINY_RCU.txt  |    1 -
>  .../selftests/rcutorture/doc/TREE_RCU-kconfig.txt  |    4 -
>  34 files changed, 7552 insertions(+), 287 deletions(-)
>  create mode 100644 Documentation/RCU/Design/Requirements/2013-08-is-it-dead.png
>  create mode 100644 Documentation/RCU/Design/Requirements/GPpartitionReaders1.svg
>  create mode 100644 Documentation/RCU/Design/Requirements/RCUApplicability.svg
>  create mode 100644 Documentation/RCU/Design/Requirements/ReadersPartitionGP1.svg
>  create mode 100644 Documentation/RCU/Design/Requirements/Requirements.html
>  create mode 100644 Documentation/RCU/Design/Requirements/Requirements.htmlx
>  create mode 100755 Documentation/RCU/Design/htmlqqz.sh

Pulled into tip:core/rcu, thanks a lot Paul!

	Ingo