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[GIT,PULL] RCU changes for v6.15

Message ID Z99wJFZC1XlvA4vC@Mac.home (mailing list archive)
State New
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Series [GIT,PULL] RCU changes for v6.15 | expand

Pull-request

git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux.git tags/rcu-next-v6.15

Message

Boqun Feng March 23, 2025, 2:21 a.m. UTC 
Hi Linus,

When the merge window opens, please pull the RCU update:

The following changes since commit 2014c95afecee3e76ca4a56956a936e23283f05b:

  Linux 6.14-rc1 (2025-02-02 15:39:26 -0800)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux.git tags/rcu-next-v6.15

for you to fetch changes up to 467c890f2d1ad6de9fd1dbd196fdc8f3ee63190a:

  Merge branches 'docs.2025.02.04a', 'lazypreempt.2025.03.04a', 'misc.2025.03.04a', 'srcu.2025.02.05a' and 'torture.2025.02.05a' (2025-03-04 18:47:32 -0800)


There is a small conflict with slab tree:

	https://lore.kernel.org/all/20250212150941.5e4fa1c9@canb.auug.org.au/

and Stephen's resolution looks good to me. I also made an example of my own resolution
at:

	git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux.git merge/rcu-vs-slab.2025.03.21a

Regards,
Boqun

----------------------------------------------------------------
RCU pull request for v6.15

This pull request contains the following branches:

docs.2025.02.04a:
 - Add broken-timing possibility to stallwarn.rst.
 - Improve discussion of this_cpu_ptr(), add raw_cpu_ptr().
 - Document self-propagating callbacks.
 - Point call_srcu() to call_rcu() for detailed memory ordering.
 - Add CONFIG_RCU_LAZY delays to call_rcu() kernel-doc header.
 - Clarify RCU_LAZY and RCU_LAZY_DEFAULT_OFF help text.
 - Remove references to old grace-period-wait primitives.

srcu.2025.02.05a:
 - Introduce srcu_read_{un,}lock_fast(), which is similar to
   srcu_read_{un,}lock_lite(): avoid smp_mb()s in lock and unlock at the
   cost of calling synchronize_rcu() in synchronize_srcu(). Moreover, by
   returning the percpu offset of the counter at srcu_read_lock_fast()
   time, srcu_read_unlock_fast() can save extra pointer dereferencing,
   which makes it faster than srcu_read_{un,}lock_lite().
   srcu_read_{un,}lock_fast() are intended to replace
   rcu_read_{un,}lock_trace() if possible.

torture.2025.02.05a:
 - Add get_torture_init_jiffies() to return the start time of the test.
 - Add a test_boost_holdoff module parameter to allow delaying boosting
   tests when building rcutorture as built-in.
 - Add grace period sequence number logging at the beginning and end of
   failure/close-call results.
 - Switch to hexadecimal for the expedited grace period sequence number
   in the rcu_exp_grace_period trace point.
 - Make cur_ops->format_gp_seqs take buffer length.
 - Move RCU_TORTURE_TEST_{CHK_RDR_STATE,LOG_CPU} to bool.
 - Complain when invalid SRCU reader_flavor is specified.
 - Add FORCE_NEED_SRCU_NMI_SAFE Kconfig for testing, which forces SRCU
   uses atomics even when percpu ops are NMI safe, and use the Kconfig
   for SRCU lockdep testing.

misc.2025.03.04a:
 - Split rcu_report_exp_cpu_mult() mask parameter and use for tracing.
 - Remove READ_ONCE() for rdp->gpwrap access in __note_gp_changes().
 - Fix get_state_synchronize_rcu_full() GP-start detection.
 - Move RCU Tasks self-tests to core_initcall().
 - Print segment lengths in show_rcu_nocb_gp_state().
 - Make RCU watch ct_kernel_exit_state() warning.
 - Flush console log from kernel_power_off().
 - rcutorture: Allow a negative value for nfakewriters.
 - rcu: Update TREE05.boot to test normal synchronize_rcu().
 - rcu: Use _full() API to debug synchronize_rcu().

lazypreempt.2025.03.04a: Make RCU handle PREEMPT_LAZY better:
 - Fix header guard for rcu_all_qs().
 - rcu: Rename PREEMPT_AUTO to PREEMPT_LAZY.
 - Update __cond_resched comment about RCU quiescent states.
 - Handle unstable rdp in rcu_read_unlock_strict().
 - Handle quiescent states for PREEMPT_RCU=n, PREEMPT_COUNT=y.
 - osnoise: Provide quiescent states.
 - Adjust rcutorture with possible PREEMPT_RCU=n && PREEMPT_COUNT=y
   combination.
 - Limit PREEMPT_RCU configurations.
 - Make rcutorture senario TREE07 and senario TREE10 use PREEMPT_LAZY=y.

----------------------------------------------------------------
Ankur Arora (7):
      rcu: fix header guard for rcu_all_qs()
      rcu: rename PREEMPT_AUTO to PREEMPT_LAZY
      sched: update __cond_resched comment about RCU quiescent states
      rcu: handle unstable rdp in rcu_read_unlock_strict()
      rcu: handle quiescent states for PREEMPT_RCU=n, PREEMPT_COUNT=y
      osnoise: provide quiescent states
      rcu: limit PREEMPT_RCU configurations

Boqun Feng (2):
      rcutorture: Update ->extendables check for lazy preemption
      Merge branches 'docs.2025.02.04a', 'lazypreempt.2025.03.04a', 'misc.2025.03.04a', 'srcu.2025.02.05a' and 'torture.2025.02.05a'

Paul E. McKenney (47):
      doc: Add broken-timing possibility to stallwarn.rst
      docs: Improve discussion of this_cpu_ptr(), add raw_cpu_ptr()
      rcu: Document self-propagating callbacks
      srcu: Point call_srcu() to call_rcu() for detailed memory ordering
      rcu: Add CONFIG_RCU_LAZY delays to call_rcu() kernel-doc header
      rcu: Clarify RCU_LAZY and RCU_LAZY_DEFAULT_OFF help text
      rcu: Remove references to old grace-period-wait primitives
      rcu: Split rcu_report_exp_cpu_mult() mask parameter and use for tracing
      srcu: Make Tiny SRCU able to operate in preemptible kernels
      srcu: Define SRCU_READ_FLAVOR_ALL in terms of symbols
      srcu: Use ->srcu_gp_seq for rcutorture reader batch
      srcu: Pull ->srcu_{un,}lock_count into a new srcu_ctr structure
      srcu: Make SRCU readers use ->srcu_ctrs for counter selection
      srcu: Make Tree SRCU updates independent of ->srcu_idx
      srcu: Force synchronization for srcu_get_delay()
      srcu: Rename srcu_check_read_flavor_lite() to srcu_check_read_flavor_force()
      srcu: Add SRCU_READ_FLAVOR_SLOWGP to flag need for synchronize_rcu()
      srcu: Pull pointer-to-integer conversion into __srcu_ptr_to_ctr()
      srcu: Pull integer-to-pointer conversion into __srcu_ctr_to_ptr()
      srcu: Move SRCU Tree/Tiny definitions from srcu.h
      srcu: Add SRCU-fast readers
      rcutorture: Add ability to test srcu_read_{,un}lock_fast()
      refscale: Add srcu_read_lock_fast() support using "srcu-fast"
      rcutorture:  Make scenario SRCU-P use srcu_read_lock_fast()
      srcu: Fix srcu_read_unlock_{lite,nmisafe}() kernel-doc
      srcu: Document that srcu_{read_lock,down_read}() can share srcu_struct
      srcu: Add srcu_down_read_fast() and srcu_up_read_fast()
      srcu: Make SRCU-fast also be NMI-safe
      torture: Add get_torture_init_jiffies() for test-start time
      rcutorture: Add a test_boost_holdoff module parameter
      rcutorture: Include grace-period sequence numbers in failure/close-call
      rcutorture: Expand failure/close-call grace-period output
      rcu: Trace expedited grace-period numbers in hexadecimal
      rcutorture: Add ftrace-compatible timestamp to GP# failure/close-call output
      rcutorture: Make cur_ops->format_gp_seqs take buffer length
      rcutorture: Move RCU_TORTURE_TEST_{CHK_RDR_STATE,LOG_CPU} to bool
      rcutorture: Complain when invalid SRCU reader_flavor is specified
      srcu: Add FORCE_NEED_SRCU_NMI_SAFE Kconfig for testing
      torture: Make SRCU lockdep testing use srcu_read_lock_nmisafe()
      rcu: Fix get_state_synchronize_rcu_full() GP-start detection
      rcu-tasks: Move RCU Tasks self-tests to core_initcall()
      rcu/nocb: Print segment lengths in show_rcu_nocb_gp_state()
      context_tracking: Make RCU watch ct_kernel_exit_state() warning
      Flush console log from kernel_power_off()
      rcutorture: Update rcutorture_one_extend_check() for lazy preemption
      rcutorture: Make scenario TREE10 build CONFIG_PREEMPT_LAZY=y
      rcutorture: Make scenario TREE07 build CONFIG_PREEMPT_LAZY=y

Uladzislau Rezki (Sony) (3):
      rcutorture: Allow a negative value for nfakewriters
      rcu: Update TREE05.boot to test normal synchronize_rcu()
      rcu: Use _full() API to debug synchronize_rcu()

Zilin Guan (1):
      rcu: Remove READ_ONCE() for rdp->gpwrap access in __note_gp_changes()

 Documentation/RCU/rcubarrier.rst                   |   5 +-
 Documentation/RCU/stallwarn.rst                    |   7 +
 Documentation/admin-guide/kernel-parameters.txt    |   5 +
 Documentation/core-api/this_cpu_ops.rst            |  22 ++-
 include/linux/printk.h                             |   6 +
 include/linux/rcupdate.h                           |  25 +--
 include/linux/rcupdate_wait.h                      |   3 +
 include/linux/rcutree.h                            |   2 +-
 include/linux/srcu.h                               | 102 ++++++++--
 include/linux/srcutiny.h                           |  29 ++-
 include/linux/srcutree.h                           |  98 ++++++++--
 include/linux/torture.h                            |   1 +
 include/trace/events/rcu.h                         |   2 +-
 init/main.c                                        |   1 -
 kernel/context_tracking.c                          |   9 +-
 kernel/printk/printk.c                             |   4 +-
 kernel/rcu/Kconfig                                 |  35 +++-
 kernel/rcu/Kconfig.debug                           |  18 +-
 kernel/rcu/rcu.h                                   |  13 +-
 kernel/rcu/rcutorture.c                            | 124 ++++++++++--
 kernel/rcu/refscale.c                              |  32 +++-
 kernel/rcu/srcutiny.c                              |  20 +-
 kernel/rcu/srcutree.c                              | 207 +++++++++++----------
 kernel/rcu/tasks.h                                 |   5 +-
 kernel/rcu/tiny.c                                  |  14 ++
 kernel/rcu/tree.c                                  |  64 +++++--
 kernel/rcu/tree_exp.h                              |   6 +-
 kernel/rcu/tree_nocb.h                             |  20 +-
 kernel/rcu/tree_plugin.h                           |  22 ++-
 kernel/reboot.c                                    |   1 +
 kernel/sched/core.c                                |   4 +-
 kernel/torture.c                                   |  12 ++
 kernel/trace/trace_osnoise.c                       |  32 ++--
 .../selftests/rcutorture/bin/srcu_lockdep.sh       |   2 +-
 .../selftests/rcutorture/configs/rcu/SRCU-P.boot   |   1 +
 .../selftests/rcutorture/configs/rcu/TREE05.boot   |   6 +
 .../selftests/rcutorture/configs/rcu/TREE07        |   3 +-
 .../selftests/rcutorture/configs/rcu/TREE10        |   3 +-
 38 files changed, 718 insertions(+), 247 deletions(-)

Comments

pr-tracker-bot@kernel.org March 25, 2025, 3:53 a.m. UTC | #1 
The pull request you sent on Sat, 22 Mar 2025 19:21:24 -0700:

> git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux.git tags/rcu-next-v6.15

has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/3ba7dfb8da62c43ea02bc278863367c2b0427cc1

Thank you!