[GIT PULL] RCU changes for v6.8

["Neeraj Upadhyay (AMD)" <neeraj.iitr10@gmail.com>]

Hi Linus,

Please pull the latest RCU git tree from:

  https://github.com/neeraju/linux.git tags/rcu.release.v6.8

# HEAD: 7dfb03dd24d43b9e7a725e70d2e8a83bb29df294:

  Merge branches 'doc.2023.12.13a', 'torture.2023.11.23a', 'fixes.2023.12.13a', 'rcu-tasks.2023.12.12b' and 'srcu.2023.12.13a' into rcu-merge.2023.12.13a (2023-12-14 01:21:31 +0530)

----------------------------------------------------------------
RCU pull request for v6.8

This pull request contains the following branches:

doc.2023.12.13a: Documentation and comment updates.

torture.2023.11.23a: RCU torture, locktorture updates that include
        cleanups; nolibc init build support for mips, ppc and rv64;
        testing of mid stall duration scenario and fixing fqs task
        creation conditions.

fixes.2023.12.13a: Misc fixes, most notably restricting usage of
        RCU CPU stall notifiers, to confine their usage primarily
        to debug kernels.

rcu-tasks.2023.12.12b: RCU tasks minor fixes.

srcu.2023.12.13a: lockdep annotation fix for NMI-safe accesses,
        callback advancing/acceleration cleanup and documentation
        improvements.

----------------------------------------------------------------
Charles Han (1):
      Documentation: RCU: Remove repeated word in comments

Frederic Weisbecker (3):
      srcu: Remove superfluous callbacks advancing from srcu_gp_start()
      srcu: No need to advance/accelerate if no callback enqueued
      srcu: Explain why callbacks invocations can't run concurrently

Neeraj Upadhyay (AMD) (1):
      Merge branches 'doc.2023.12.13a', 'torture.2023.11.23a', 'fixes.2023.12.13a', 'rcu-tasks.2023.12.12b' and 'srcu.2023.12.13a' into rcu-merge.2023.12.13a

Paul E. McKenney (7):
      locktorture: Increase Hamming distance between call_rcu_chain and rcu_call_chains
      rcutorture: Add mid-sized stall to TREE07
      rcu-tasks: Mark RCU Tasks accesses to current->rcu_tasks_idle_cpu
      rcu: Restrict access to RCU CPU stall notifiers
      doc: Clarify RCU Tasks reader/updater checklist
      doc: Mention address and data dependencies in rcu_dereference.rst
      doc: Clarify historical disclaimers in memory-barriers.txt

Pedro Falcato (1):
      rcu: Remove unused macros from rcupdate.h

Philipp Stanner (1):
      rculist.h: docs: Fix wrong function summary

Sebastian Andrzej Siewior (1):
      srcu: Use try-lock lockdep annotation for NMI-safe access.

Thomas Weißschuh (1):
      rcutorture: add nolibc init support for mips, ppc and rv64

Zqiang (2):
      rcutorture: Add fqs_holdoff check before fqs_task is created
      rcu: Force quiescent states only for ongoing grace period

 Documentation/RCU/checklist.rst                            | 25 ++++++++++++++++---------
 Documentation/RCU/rcu_dereference.rst                      | 27 ++++++++++++++++++++-------
 Documentation/RCU/torture.rst                              |  2 +-
 Documentation/admin-guide/kernel-parameters.txt            |  6 ++++++
 Documentation/memory-barriers.txt                          | 17 ++++++++++-------
 include/linux/rcu_notifier.h                               |  6 +++---
 include/linux/rculist.h                                    |  2 +-
 include/linux/rcupdate.h                                   |  9 ++++++---
 include/linux/srcu.h                                       |  2 +-
 kernel/locking/locktorture.c                               | 18 +++++++++---------
 kernel/rcu/Kconfig.debug                                   | 25 +++++++++++++++++++++++++
 kernel/rcu/rcu.h                                           |  8 +++++---
 kernel/rcu/rcutorture.c                                    | 16 ++++++++++------
 kernel/rcu/srcutree.c                                      | 24 +++++++++++-------------
 kernel/rcu/tasks.h                                         |  4 ++--
 kernel/rcu/tree.c                                          |  2 ++
 kernel/rcu/tree_stall.h                                    | 11 ++++++++++-
 kernel/rcu/update.c                                        |  6 ++++++
 tools/testing/selftests/rcutorture/bin/mkinitrd.sh         |  5 ++++-
 tools/testing/selftests/rcutorture/configs/rcu/TREE07.boot |  3 +++
 20 files changed, 151 insertions(+), 67 deletions(-)