[GIT PULL] RCU changes for v6.2

From: Paul E. McKenney
Date: Fri Dec 02 2022 - 20:11:55 EST

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Hello, Linus,

Once the merge window opens, please pull the latest RCU git tree from:

git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git tags/rcu.2022.12.02a
# HEAD: 87492c06e68d802852c7ba76b4d3fde50807d72a Merge branches 'doc.2022.10.20a', 'fixes.2022.10.21a', 'lazy.2022.11.30a', 'srcunmisafe.2022.11.09a', 'torture.2022.10.18c' and 'torturescript.2022.10.20a' into HEAD (2022-11-30 13:20:05 -0800)

----------------------------------------------------------------
RCU pull request for v6.2

This pull request contains the following branches:

doc.2022.10.20a: Documentation updates. This is the second
in a series from an ongoing review of the RCU documentation.

fixes.2022.10.21a: Miscellaneous fixes.

lazy.2022.11.30a: Introduces a default-off Kconfig option that depends
on RCU_NOCB_CPU that, on CPUs mentioned in the nohz_full or
rcu_nocbs boot-argument CPU lists, causes call_rcu() to introduce
delays. These delays result in significant power savings on
nearly idle Android and ChromeOS systems. These savings range
from a few percent to more than ten percent.

This series also includes several commits that change call_rcu()
to a new call_rcu_hurry() function that avoids these delays in
a few cases, for example, where timely wakeups are required.
Several of these are outside of RCU and thus have acks and
reviews from the relevant maintainers.

srcunmisafe.2022.11.09a: Creates an srcu_read_lock_nmisafe() and an
srcu_read_unlock_nmisafe() for architectures that support NMIs,
but which do not provide NMI-safe this_cpu_inc(). These NMI-safe
SRCU functions are required by the upcoming lockless printk()
work by John Ogness et al.

That printk() series depends on these commits, so if you pull
the printk() series before this one, you will have already
pulled in this branch, plus two more SRCU commits:

0cd7e350abc4 ("rcu: Make SRCU mandatory")
51f5f78a4f80 ("srcu: Make Tiny synchronize_srcu() check for readers")

These two commits appear to work well, but do not have
sufficient testing exposure over a long enough time for me to
feel comfortable pushing them unless something in mainline is
definitely going to use them immediately, and currently only
the new printk() work uses them.

torture.2022.10.18c: Changes providing minor but important increases
in test coverage for the new RCU polled-grace-period APIs.

torturescript.2022.10.20a: Changes that avoid redundant kernel builds,
thus providing about a 30% speedup for the torture.sh acceptance
test.

----------------------------------------------------------------
Eric Dumazet (1):
net: devinet: Reduce refcount before grace period

Frederic Weisbecker (4):
rcu: Fix missing nocb gp wake on rcu_barrier()
srcu: Warn when NMI-unsafe API is used in NMI
srcu: Explain the reason behind the read side critical section on GP start
srcu: Debug NMI safety even on archs that don't require it

Joel Fernandes (Google) (10):
rcu: Use READ_ONCE() for lockless read of rnp->qsmask
rcu: Fix late wakeup when flush of bypass cblist happens
rcu: Make call_rcu() lazy to save power
rcu: Refactor code a bit in rcu_nocb_do_flush_bypass()
rcuscale: Add laziness and kfree tests
rcu/sync: Use call_rcu_hurry() instead of call_rcu
rcu/rcuscale: Use call_rcu_hurry() for async reader test
rcu/rcutorture: Use call_rcu_hurry() where needed
percpu-refcount: Use call_rcu_hurry() for atomic switch
net: Use call_rcu_hurry() for dst_release()

John Ogness (1):
rcu: Implement lockdep_rcu_enabled for !CONFIG_DEBUG_LOCK_ALLOC

Paul E. McKenney (25):
srcu: Convert ->srcu_lock_count and ->srcu_unlock_count to atomic
doc: Remove arrayRCU.rst
doc: Update checklist.txt
rcutorture: Verify NUM_ACTIVE_RCU_POLL_FULL_OLDSTATE
rcutorture: Verify NUM_ACTIVE_RCU_POLL_OLDSTATE
rcutorture: Add --bootargs parameter to kvm-again.sh
torture: Use mktemp instead of guessing at unique names
rcutorture: Make kvm-test-1-run-qemu.sh check for alternative output
rcutorture: Make kvm-recheck.sh export TORTURE_SUITE
rcutorture: Add --datestamp parameter to kvm-again.sh
rcutorture: Avoid redundant builds for rcuscale and refscale in torture.sh
doc: Update listRCU.rst
doc: Update RCU's lockdep.rst
srcu: Create an srcu_read_lock_nmisafe() and srcu_read_unlock_nmisafe()
srcu: Check for consistent per-CPU per-srcu_struct NMI safety
srcu: Check for consistent global per-srcu_struct NMI safety
arch/x86: Add ARCH_HAS_NMI_SAFE_THIS_CPU_OPS Kconfig option
arch/arm64: Add ARCH_HAS_NMI_SAFE_THIS_CPU_OPS Kconfig option
rcutorture: Avoid torture.sh compressing identical files
torture: Make torture.sh create a properly formatted log file
slab: Explain why SLAB_TYPESAFE_BY_RCU reference before locking
rcu-tasks: Make grace-period-age message human-readable
arch/loongarch: Add ARCH_HAS_NMI_SAFE_THIS_CPU_OPS Kconfig option
arch/s390: Add ARCH_HAS_NMI_SAFE_THIS_CPU_OPS Kconfig option
Merge branches 'doc.2022.10.20a', 'fixes.2022.10.21a', 'lazy.2022.11.30a', 'srcunmisafe.2022.11.09a', 'torture.2022.10.18c' and 'torturescript.2022.10.20a' into HEAD

Pingfan Liu (1):
rcu: Synchronize ->qsmaskinitnext in rcu_boost_kthread_setaffinity()

Uladzislau Rezki (2):
scsi/scsi_error: Use call_rcu_hurry() instead of call_rcu()
workqueue: Make queue_rcu_work() use call_rcu_hurry()

Vineeth Pillai (1):
rcu: Shrinker for lazy rcu

Yipeng Zou (1):
rcu: Remove rcu_is_idle_cpu()

Zeng Heng (1):
rcu: Remove unused 'cpu' in rcu_virt_note_context_switch()

Zhen Lei (1):
rcu: Simplify rcu_init_nohz() cpumask handling

Zqiang (2):
rcu: Remove duplicate RCU exp QS report from rcu_report_dead()
rcu: Fix __this_cpu_read() lockdep warning in rcu_force_quiescent_state()

Documentation/RCU/arrayRCU.rst | 165 -------------
Documentation/RCU/checklist.rst | 244 +++++++++++--------
Documentation/RCU/index.rst | 1 -
Documentation/RCU/listRCU.rst | 174 ++++++++------
Documentation/RCU/lockdep.rst | 4 +
arch/Kconfig | 3 +
arch/arm64/Kconfig | 1 +
arch/loongarch/Kconfig | 1 +
arch/s390/Kconfig | 1 +
arch/x86/Kconfig | 1 +
drivers/scsi/scsi_error.c | 2 +-
include/linux/kvm_host.h | 2 +-
include/linux/rcupdate.h | 14 ++
include/linux/rcutiny.h | 4 +-
include/linux/rcutree.h | 4 +-
include/linux/slab.h | 11 +
include/linux/srcu.h | 63 +++++
include/linux/srcutree.h | 5 +-
kernel/rcu/Kconfig | 11 +
kernel/rcu/rcu.h | 8 +
kernel/rcu/rcuscale.c | 69 +++++-
kernel/rcu/rcutorture.c | 72 ++++--
kernel/rcu/srcutree.c | 100 ++++++--
kernel/rcu/sync.c | 2 +-
kernel/rcu/tasks.h | 2 +-
kernel/rcu/tiny.c | 2 +-
kernel/rcu/tree.c | 152 +++++++-----
kernel/rcu/tree.h | 12 +-
kernel/rcu/tree_exp.h | 2 +-
kernel/rcu/tree_nocb.h | 259 ++++++++++++++++-----
kernel/rcu/tree_plugin.h | 5 +-
kernel/workqueue.c | 2 +-
lib/percpu-refcount.c | 3 +-
net/core/dst.c | 2 +-
net/ipv4/devinet.c | 19 +-
.../testing/selftests/rcutorture/bin/config2csv.sh | 3 +-
.../selftests/rcutorture/bin/config_override.sh | 3 +-
.../selftests/rcutorture/bin/configcheck.sh | 3 +-
.../testing/selftests/rcutorture/bin/configinit.sh | 3 +-
.../testing/selftests/rcutorture/bin/kvm-again.sh | 49 +++-
.../selftests/rcutorture/bin/kvm-assign-cpus.sh | 3 +-
.../testing/selftests/rcutorture/bin/kvm-build.sh | 3 +-
.../selftests/rcutorture/bin/kvm-end-run-stats.sh | 3 +-
.../selftests/rcutorture/bin/kvm-recheck.sh | 2 +-
.../testing/selftests/rcutorture/bin/kvm-remote.sh | 13 +-
.../rcutorture/bin/kvm-test-1-run-batch.sh | 3 +-
.../rcutorture/bin/kvm-test-1-run-qemu.sh | 5 +-
.../selftests/rcutorture/bin/kvm-test-1-run.sh | 3 +-
.../selftests/rcutorture/bin/kvm-transform.sh | 68 +++++-
tools/testing/selftests/rcutorture/bin/kvm.sh | 3 +-
.../selftests/rcutorture/bin/parse-build.sh | 3 +-
tools/testing/selftests/rcutorture/bin/torture.sh | 145 ++++++++++--
52 files changed, 1159 insertions(+), 578 deletions(-)
delete mode 100644 Documentation/RCU/arrayRCU.rst

Next message: Dan Williams: "Re: [PATCH V2 03/11] cxl/mem: Implement Clear Event Records command"
Previous message: Mina Almasry: "[PATCH v1] [mm-unstable] mm: Fix memcg reclaim on memory tiered systems"
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