[GIT PULL] RCU changes for v7.1

[GIT PULL] RCU changes for v7.1

[Joel Fernandes]

Hi Linus,

Once the merge window opens, please pull the following RCU changes for v7.1.

The following changes since commit 7aaa8047eafd0bd628065b15757d9b48c5f9c07d:

  Linux 7.0-rc6 (2026-03-29 15:40:00 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux.git tags/rcu.2026.03.31a

for you to fetch changes up to 95c7d025cc8c3c6c41206e2a18332eb04878b7ef:

  rcutorture: Test call_srcu() with preemption disabled and not (2026-03-30 15:48:14 -0400)

----------------------------------------------------------------
RCU changes for v7.1

NOCB CPU management:

- Consolidate rcu_nocb_cpu_offload() and rcu_nocb_cpu_deoffload() to reduce
  code duplication.
- Extract nocb_bypass_needs_flush() helper to reduce duplication in NOCB
  bypass path.

rcutorture/torture infrastructure:

- Add NOCB01 config for RCU_LAZY torture testing.
- Add NOCB02 config for NOCB poll mode testing.
- Add TRIVIAL-PREEMPT config for textbook-style preemptible RCU torture.
- Test call_srcu() with preemption both disabled and enabled.
- Remove kvm-check-branches.sh in favor of kvm-series.sh.
- Make hangs more visible in torture.sh output.
- Add informative message for tests without a recheck file.
- Fix numeric test comparison in srcu_lockdep.sh.
- Use torture_shutdown_init() in refscale and rcuscale instead of open-coded
  shutdown functions.
- Fix modulo-zero error in torture_hrtimeout_ns().

SRCU:

- Fix SRCU read flavor macro comments.
- Fix s/they disables/they disable/ typo in srcu_read_unlock_fast().

RCU Tasks:

- Document that RCU Tasks Trace grace periods now imply RCU grace periods.
- Remove unnecessary smp_store_release() in cblist_init_generic().

RCU stall:

- Add BOOTPARAM_RCU_STALL_PANIC Kconfig option to allow triggering a kernel
  panic on RCU stall via kernel boot parameter.

----------------------------------------------------------------
Gustavo Luiz Duarte (1):
      rcu: Add BOOTPARAM_RCU_STALL_PANIC Kconfig option

Joel Fernandes (4):
      rcutorture: Add NOCB01 config for RCU_LAZY torture testing
      rcutorture: Add NOCB02 config for nocb poll mode testing
      rcu/nocb: Consolidate rcu_nocb_cpu_offload/deoffload functions
      rcu/nocb: Extract nocb_bypass_needs_flush() to reduce duplication

Paul E. McKenney (12):
      rcutorture: Add a textbook-style trivial preemptible RCU
      kvm-check-branches.sh: Remove in favor of kvm-series.sh
      torture: Make hangs more visible in torture.sh output
      torture: Print informative message for test without recheck file
      rcutorture: Fix numeric "test" comparison in srcu_lockdep.sh
      refscale: Ditch ref_scale_shutdown in favor of torture_shutdown_init()
      rcuscale: Ditch rcu_scale_shutdown in favor of torture_shutdown_init()
      srcu: Fix SRCU read flavor macro comments
      srcu: Fix s/they disables/they disable/ typo in srcu_read_unlock_fast()
      rcu-tasks: Document that RCU Tasks Trace grace periods now imply RCU grace periods
      torture: Avoid modulo-zero error in torture_hrtimeout_ns()
      rcutorture: Test call_srcu() with preemption disabled and not

Zqiang (1):
      rcu-tasks: Remove unnecessary smp_store_release() in cblist_init_generic()

 .../RCU/Design/Requirements/Requirements.rst       |   7 ++
 include/linux/rcupdate.h                           |   9 +-
 include/linux/sched.h                              |   4 +
 include/linux/srcu.h                               |   4 +-
 include/linux/srcutree.h                           |   2 +-
 kernel/rcu/Kconfig.debug                           |  35 ++++++
 kernel/rcu/rcu.h                                   |   4 +
 kernel/rcu/rcuscale.c                              |  78 ++++--------
 kernel/rcu/rcutorture.c                            |  64 +++++++++-
 kernel/rcu/refscale.c                              |  51 +++-----
 kernel/rcu/tasks.h                                 |   6 +-
 kernel/rcu/tree_nocb.h                             | 137 ++++++++++++---------
 kernel/rcu/tree_stall.h                            |   2 +-
 kernel/rcu/update.c                                |  22 ++++
 kernel/torture.c                                   |   2 +-
 .../selftests/rcutorture/bin/kvm-check-branches.sh | 102 ---------------
 .../selftests/rcutorture/bin/kvm-recheck.sh        |   9 +-
 .../selftests/rcutorture/bin/parse-console.sh      |   1 -
 .../selftests/rcutorture/bin/srcu_lockdep.sh       |   6 +-
 .../selftests/rcutorture/configs/rcu/NOCB01        |  21 ++++
 .../selftests/rcutorture/configs/rcu/NOCB01.boot   |   2 +
 .../selftests/rcutorture/configs/rcu/NOCB02        |  20 +++
 .../selftests/rcutorture/configs/rcu/NOCB02.boot   |   3 +
 .../rcutorture/configs/rcu/TRIVIAL-PREEMPT         |  12 ++
 .../rcutorture/configs/rcu/TRIVIAL-PREEMPT.boot    |   3 +
 .../rcutorture/configs/rcuscale/ver_functions.sh   |   2 +-
 .../rcutorture/configs/refscale/ver_functions.sh   |   2 +-
 27 files changed, 334 insertions(+), 276 deletions(-)
 delete mode 100755 tools/testing/selftests/rcutorture/bin/kvm-check-branches.sh
 create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/NOCB01
 create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/NOCB01.boot
 create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/NOCB02
 create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/NOCB02.boot
 create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/TRIVIAL-PREEMPT
 create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/TRIVIAL-PREEMPT.boot

-- 
Joel Fernandes