[GIT PULL] RCU changes for v5.7

[Ingo Molnar]

Linus,

Please pull the latest core-rcu-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core-rcu-for-linus

   # HEAD: baf5fe761846815164753d1bd0638fd3696db8fd Merge branch 'for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu

The main changes in this cycle were:

 - Make kfree_rcu() use kfree_bulk() for added performance
 - RCU updates
 - Callback-overload handling updates
 - Tasks-RCU KCSAN and sparse updates
 - Locking torture test and RCU torture test updates
 - Documentation updates
 - Miscellaneous fixes

 Thanks,

	Ingo

------------------>
Amol Grover (1):
      rculist: Add brackets around cond argument in __list_check_rcu macro

Colin Ian King (1):
      rcu: Fix spelling mistake "leval" -> "level"

Eric Dumazet (1):
      timer: Use hlist_unhashed_lockless() in timer_pending()

Joel Fernandes (Google) (2):
      rcuperf: Measure memory footprint during kfree_rcu() test
      doc: Add some more RCU list patterns in the kernel

Jules Irenge (4):
      rcu: Add missing annotation for rcu_nocb_bypass_lock()
      rcu/nocb: Add missing annotation for rcu_nocb_bypass_unlock()
      rcu: Add missing annotation for exit_tasks_rcu_start()
      rcu: Add missing annotation for exit_tasks_rcu_finish()

Madhuparna Bhowmik (1):
      nfs: Fix nfs_access_get_cached_rcu() sparse error

Paul E. McKenney (54):
      rcu: Warn on for_each_leaf_node_cpu_mask() from non-leaf
      rcu: Fix exp_funnel_lock()/rcu_exp_wait_wake() datarace
      rcu: Provide debug symbols and line numbers in KCSAN runs
      rcu: Add WRITE_ONCE() to rcu_node ->qsmask update
      rcu: Add WRITE_ONCE to rcu_node ->exp_seq_rq store
      rcu: Add READ_ONCE() to rcu_node ->gp_seq
      rcu: Add WRITE_ONCE() to rcu_state ->gp_req_activity
      rcu: Add WRITE_ONCE() to rcu_node ->qsmaskinitnext
      locking/rtmutex: rcu: Add WRITE_ONCE() to rt_mutex ->owner
      rcu: Add READ_ONCE() to rcu_segcblist ->tails[]
      rcu: Add *_ONCE() for grace-period progress indicators
      rcu: Add READ_ONCE() to rcu_data ->gpwrap
      rcu: Add *_ONCE() to rcu_data ->rcu_forced_tick
      rcu: Add *_ONCE() to rcu_node ->boost_kthread_status
      rcu: Remove dead code from rcu_segcblist_insert_pend_cbs()
      rcu: Add WRITE_ONCE() to rcu_state ->gp_start
      rcu: Fix rcu_barrier_callback() race condition
      rcu: Don't flag non-starting GPs before GP kthread is running
      rcu: Optimize and protect atomic_cmpxchg() loop
      rcu: Tighten rcu_lockdep_assert_cblist_protected() check
      rcu: Make nocb_gp_wait() double-check unexpected-callback warning
      locktorture: Print ratio of acquisitions, not failures
      locktorture: Allow CPU-hotplug to be disabled via --bootargs
      locktorture: Use private random-number generators
      locktorture: Forgive apparent unfairness if CPU hotplug
      rcu: Clear ->core_needs_qs at GP end or self-reported QS
      rcu: React to callback overload by aggressively seeking quiescent states
      rcu: React to callback overload by boosting RCU readers
      rcu: Update __call_rcu() comments
      rcu-tasks: *_ONCE() for rcu_tasks_cbs_head
      srcu: Fix __call_srcu()/process_srcu() datarace
      srcu: Fix __call_srcu()/srcu_get_delay() datarace
      srcu: Fix process_srcu()/srcu_batches_completed() datarace
      srcu: Hold srcu_struct ->lock when updating ->srcu_gp_seq
      rcutorture: Suppress forward-progress complaints during early boot
      torture: Make results-directory date format completion-friendly
      rcutorture: Refrain from callback flooding during boot
      torture: Forgive -EBUSY from boottime CPU-hotplug operations
      rcutorture: Allow boottime stall warnings to be suppressed
      rcutorture: Suppress boottime bad-sequence warnings
      torture: Allow disabling of boottime CPU-hotplug torture operations
      rcutorture: Add 100-CPU configuration
      rcutorture: Summarize summary of build and run results
      rcutorture: Make kvm-find-errors.sh abort on bad directory
      rcutorture: Fix rcu_torture_one_read()/rcu_torture_writer() data race
      rcutorture: Fix stray access to rcu_fwd_cb_nodelay
      rcutorture: Add READ_ONCE() to rcu_torture_count and rcu_torture_batch
      rcutorture: Annotation lockless accesses to rcu_torture_current
      rcutorture: Make rcu_torture_barrier_cbs() post from corresponding CPU
      rcutorture: Manually clean up after rcu_barrier() failure
      rcutorture: Set KCSAN Kconfig options to detect more data races
      doc: Add rcutorture scripting to torture.txt
      rcu: Mark rcu_state.gp_seq to detect concurrent writes
      rcu: Make rcu_barrier() account for offline no-CBs CPUs

SeongJae Park (8):
      rcu: Fix typos in file-header comments
      doc/RCU/Design: Remove remaining HTML tags in ReST files
      doc/RCU/listRCU: Fix typos in a example code snippets
      doc/RCU/listRCU: Update example function name
      doc/RCU/rcu: Use ':ref:' for links to other docs
      doc/RCU/rcu: Use absolute paths for non-rst files
      doc/RCU/rcu: Use https instead of http if possible
      Documentation/memory-barriers: Fix typos

Uladzislau Rezki (Sony) (2):
      rcu: Support kfree_bulk() interface in kfree_rcu()
      rcu: Add a trace event for kfree_rcu() use of kfree_bulk()


 .../Memory-Ordering/Tree-RCU-Memory-Ordering.rst   |   8 +-
 Documentation/RCU/listRCU.rst                      | 281 ++++++++++---
 Documentation/RCU/rcu.rst                          |  18 +-
 Documentation/RCU/torture.txt                      | 147 ++++++-
 Documentation/admin-guide/kernel-parameters.txt    |  19 +
 Documentation/memory-barriers.txt                  |   8 +-
 fs/nfs/dir.c                                       |   2 +-
 include/linux/rculist.h                            |   4 +-
 include/linux/rcutiny.h                            |   1 +
 include/linux/rcutree.h                            |   1 +
 include/linux/timer.h                              |   2 +-
 include/trace/events/rcu.h                         |  29 ++
 kernel/locking/locktorture.c                       |  15 +-
 kernel/locking/rtmutex.c                           |   2 +-
 kernel/rcu/Makefile                                |   4 +
 kernel/rcu/rcu.h                                   |  23 +-
 kernel/rcu/rcu_segcblist.c                         |   4 +-
 kernel/rcu/rcuperf.c                               |  14 +-
 kernel/rcu/rcutorture.c                            |  67 ++-
 kernel/rcu/srcutree.c                              |  18 +-
 kernel/rcu/tree.c                                  | 452 +++++++++++++++------
 kernel/rcu/tree.h                                  |   4 +
 kernel/rcu/tree_exp.h                              |  13 +-
 kernel/rcu/tree_plugin.h                           |  25 +-
 kernel/rcu/tree_stall.h                            |  41 +-
 kernel/rcu/update.c                                |  28 +-
 kernel/time/timer.c                                |   7 +-
 kernel/torture.c                                   |  29 +-
 .../testing/selftests/rcutorture/bin/functions.sh  |   2 +-
 .../selftests/rcutorture/bin/kvm-find-errors.sh    |   2 +
 .../selftests/rcutorture/bin/kvm-recheck.sh        |  17 +-
 tools/testing/selftests/rcutorture/bin/kvm.sh      |   2 +-
 .../selftests/rcutorture/configs/rcu/CFcommon      |   2 +
 .../selftests/rcutorture/configs/rcu/TREE10        |  18 +
 34 files changed, 1015 insertions(+), 294 deletions(-)
 create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/TREE10