RCU changes for v5.20 (or whatever)

From: Paul E. McKenney
Date: Sun Jul 31 2022 - 12:53:15 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.2022.07.26a
# HEAD: 34bc7b454dc31f75a0be7ee8ab378135523d7c51: Merge branch 'ctxt.2022.07.05a' into HEAD (2022-07-21 17:46:18 -0700)

There are really six more branches for a total of seven, but the other
six had to be merged separately as the parent of the above commit here:

d38c8fe48354 ("Merge branches 'doc.2022.06.21a', 'fixes.2022.07.19a', 'nocb.2022.07.19a', 'poll.2022.07.21a', 'rcu-tasks.2022.06.21a' and 'torture.2022.06.21a' into HEAD

Stephen Rothwell located a conflict with these two commits, the latter
already in mainline:

24a9c54182b3 ("context_tracking: Split user tracking Kconfig")
7fd6ef61a5d6 ("LoongArch: Drop these obsolete selects in Kconfig")

The branch resolution.2022.07.26a in -rcu provides a sample merge using
Stephen's suggested merge-conflict fix:

https://lore.kernel.org/all/20220708141246.43111241@xxxxxxxxxxxxxxxx/

----------------------------------------------------------------
RCU pull request for v5.20 (or whatever)

This pull request contains the following branches:

doc.2022.06.21a: Documentation updates.

fixes.2022.07.19a: Miscellaneous fixes.

nocb.2022.07.19a: Callback-offload updates, perhaps most notably a new
RCU_NOCB_CPU_DEFAULT_ALL Kconfig option that causes all CPUs to
be offloaded at boot time, regardless of kernel boot parameters.
This is useful to battery-powered systems such as ChromeOS
and Android. In addition, a new RCU_NOCB_CPU_CB_BOOST kernel
boot parameter prevents offloaded callbacks from interfering
with real-time workloads and with energy-efficiency mechanisms.

poll.2022.07.21a: Polled grace-period updates, perhaps most notably
making these APIs account for both normal and expedited grace
periods.

rcu-tasks.2022.06.21a: Tasks RCU updates, perhaps most notably reducing
the CPU overhead of RCU tasks trace grace periods by more than
a factor of two on a system with 15,000 tasks. The reduction
is expected to increase with the number of tasks, so it seems
reasonable to hypothesize that a system with 150,000 tasks might
see a 20-fold reduction in CPU overhead.

torture.2022.06.21a: Torture-test updates.

ctxt.2022.07.05a: Updates that merge RCU's dyntick-idle tracking into
context tracking, thus reducing the overhead of transitioning to
kernel mode from either idle or nohz_full userspace execution
for kernels that track context independently of RCU. This is
expected to be helpful primarily for kernels built with
CONFIG_NO_HZ_FULL=y.

----------------------------------------------------------------
Anna-Maria Behnsen (1):
rcu/torture: Change order of warning and trace dump

Chen Zhongjin (1):
locking/csd_lock: Change csdlock_debug from early_param to __setup

Frederic Weisbecker (21):
context_tracking: Remove unused context_tracking_in_user()
context_tracking: Add a note about noinstr VS unsafe context tracking functions
rcutorture: Fix ksoftirqd boosting timing and iteration
context_tracking: Rename __context_tracking_enter/exit() to __ct_user_enter/exit()
context_tracking: Rename context_tracking_user_enter/exit() to user_enter/exit_callable()
context_tracking: Rename context_tracking_enter/exit() to ct_user_enter/exit()
context_tracking: Rename context_tracking_cpu_set() to ct_cpu_track_user()
context_tracking: Split user tracking Kconfig
context_tracking: Take idle eqs entrypoints over RCU
context_tracking: Take IRQ eqs entrypoints over RCU
context_tracking: Take NMI eqs entrypoints over RCU
rcu/context-tracking: Remove rcu_irq_enter/exit()
rcu/context_tracking: Move dynticks counter to context tracking
rcu/context_tracking: Move dynticks_nesting to context tracking
rcu/context_tracking: Move dynticks_nmi_nesting to context tracking
rcu/context-tracking: Move deferred nocb resched to context tracking
rcu/context-tracking: Move RCU-dynticks internal functions to context_tracking
rcu/context-tracking: Remove unused and/or unecessary middle functions
context_tracking: Convert state to atomic_t
MAINTAINERS: Add Paul as context tracking maintainer
rcu/nocb: Add/del rdp to iterate from rcuog itself

Joel Fernandes (1):
rcu/nocb: Add an option to offload all CPUs on boot

Joel Fernandes (Google) (1):
rcu/kvfree: Remove useless monitor_todo flag

Johannes Berg (1):
rcu: tiny: Record kvfree_call_rcu() call stack for KASAN

Li Qiong (1):
rcutorture: Handle failure of memory allocation functions

Neeraj Upadhyay (2):
srcu: Make expedited RCU grace periods block even less frequently
rcu/tree: Add comment to describe GP-done condition in fqs loop

Patrick Wang (1):
rcu: Avoid tracing a few functions executed in stop machine

Paul E. McKenney (57):
rcu: Make normal polling GP be more precise about sequence numbers
rcu: Provide a get_completed_synchronize_rcu() function
rcutorture: Validate get_completed_synchronize_rcu()
rcu-tasks: Check for abandoned callbacks
rcu-tasks: Split rcu_tasks_one_gp() from rcu_tasks_kthread()
rcu-tasks: Move synchronize_rcu_tasks_generic() down
rcu-tasks: Drive synchronous grace periods from calling task
rcu-tasks: Merge state into .b.need_qs and atomically update
rcu-tasks: Remove rcu_tasks_trace_postgp() wait for counter
rcu-tasks: Make trc_read_check_handler() fetch ->trc_reader_nesting only once
rcu-tasks: Idle tasks on offline CPUs are in quiescent states
rcu-tasks: Handle idle tasks for recently offlined CPUs
rcu-tasks: RCU Tasks Trace grace-period kthread has implicit QS
rcu-tasks: Make rcu_note_context_switch() unconditionally call rcu_tasks_qs()
rcu-tasks: Simplify trc_inspect_reader() QS logic
rcu-tasks: Add slow-IPI indicator to RCU Tasks Trace stall warnings
rcu-tasks: Flag offline CPUs in RCU Tasks Trace stall warnings
rcu-tasks: Make RCU Tasks Trace stall warnings print full .b.need_qs field
rcu-tasks: Make RCU Tasks Trace stall warning handle idle offline tasks
rcu-tasks: Add data structures for lightweight grace periods
rcu-tasks: Track blocked RCU Tasks Trace readers
rcu-tasks: Untrack blocked RCU Tasks Trace at reader end
rcu-tasks: Add blocked-task indicator to RCU Tasks Trace stall warnings
rcu-tasks: Move rcu_tasks_trace_pertask() before rcu_tasks_trace_pregp_step()
rcu-tasks: Avoid rcu_tasks_trace_pertask() duplicate list additions
rcu-tasks: Scan running tasks for RCU Tasks Trace readers
rcu-tasks: Pull in tasks blocked within RCU Tasks Trace readers
rcu-tasks: Stop RCU Tasks Trace from scanning idle tasks
torture: Make kvm-remote.sh announce which system is being waited on
rcu: Apply noinstr to rcu_idle_enter() and rcu_idle_exit()
rcutorture: Update rcutorture.fwd_progress help text
doc: Document the rcutree.rcu_divisor kernel boot parameter
doc: Document rcutree.nocb_nobypass_lim_per_jiffy kernel parameter
rcu-tasks: Stop RCU Tasks Trace from scanning full tasks list
rcu-tasks: Maintain a count of tasks blocking RCU Tasks Trace grace period
rcu-tasks: Eliminate RCU Tasks Trace IPIs to online CPUs
rcu-tasks: Disable and enable CPU hotplug in same function
rcu-tasks: Update comments
rcu-tasks: Be more patient for RCU Tasks boot-time testing
rcutorture: Simplify rcu_torture_read_exit_child() loop
torture: Adjust to again produce debugging information
rcutorture: Make failure indication note reader-batch overflow
torture: Create kvm-check-branches.sh output in proper location
context_tracking: Use arch_atomic_read() in __ct_state for KASAN
srcu: Block less aggressively for expedited grace periods
rcu: Decrease FQS scan wait time in case of callback overloading
rcu: Forbid RCU_STRICT_GRACE_PERIOD in TINY_RCU kernels
rcu: Initialize first_gp_fqs at declaration in rcu_gp_fqs()
rcu: Switch polled grace-period APIs to ->gp_seq_polled
rcu: Make polled grace-period API account for expedited grace periods
rcu: Make Tiny RCU grace periods visible to polled APIs
rcutorture: Verify that polled GP API sees synchronous grace periods
rcu: Add polled expedited grace-period primitives
rcutorture: Test polled expedited grace-period primitives
rcu: Diagnose extended sync_rcu_do_polled_gp() loops
Merge branches 'doc.2022.06.21a', 'fixes.2022.07.19a', 'nocb.2022.07.19a', 'poll.2022.07.21a', 'rcu-tasks.2022.06.21a' and 'torture.2022.06.21a' into HEAD
Merge branch 'ctxt.2022.07.05a' into HEAD

Uladzislau Rezki (Sony) (1):
rcu/nocb: Add option to opt rcuo kthreads out of RT priority

Waiman Long (1):
rcu-tasks: Use delayed_work to delay rcu_tasks_verify_self_tests()

Zqiang (13):
rcu: Dump rcuc kthread status for CPUs not reporting quiescent state
rcutorture: Fix memory leak in rcu_test_debug_objects()
rcuscale: Fix smp_processor_id()-in-preemptible warnings
refscale: Convert test_lock spinlock to raw_spinlock
rcu: Add rnp->cbovldmask check in rcutree_migrate_callbacks()
rcu: Immediately boost preempted readers for strict grace periods
rcu: Cleanup RCU urgency state for offline CPU
rcu/nocb: Invert rcu_state.barrier_mutex VS hotplug lock locking order
rcu/nocb: Fix NOCB kthreads spawn failure with rcu_nocb_rdp_deoffload() direct call
rcu: Add nocb_cb_kthread check to rcu_is_callbacks_kthread()
rcu/nocb: Avoid polling when my_rdp->nocb_head_rdp list is empty
rcu: Put panic_on_rcu_stall() after expedited RCU CPU stall warnings
rcu: Add irqs-disabled indicator to expedited RCU CPU stall warnings

.../RCU/Design/Requirements/Requirements.rst | 10 +-
Documentation/RCU/stallwarn.rst | 6 +-
Documentation/admin-guide/kernel-parameters.txt | 52 ++
.../time/context-tracking/arch-support.txt | 6 +-
MAINTAINERS | 1 +
arch/Kconfig | 8 +-
arch/arm/Kconfig | 2 +-
arch/arm/kernel/entry-common.S | 4 +-
arch/arm/kernel/entry-header.S | 12 +-
arch/arm/mach-imx/cpuidle-imx6q.c | 5 +-
arch/arm64/Kconfig | 2 +-
arch/arm64/kernel/entry-common.c | 14 +-
arch/csky/Kconfig | 2 +-
arch/csky/kernel/entry.S | 8 +-
arch/loongarch/Kconfig | 2 +-
arch/mips/Kconfig | 2 +-
arch/powerpc/Kconfig | 2 +-
arch/powerpc/include/asm/context_tracking.h | 2 +-
arch/riscv/Kconfig | 2 +-
arch/riscv/kernel/entry.S | 12 +-
arch/sparc/Kconfig | 2 +-
arch/sparc/kernel/rtrap_64.S | 2 +-
arch/x86/Kconfig | 4 +-
arch/x86/mm/fault.c | 2 +-
arch/xtensa/Kconfig | 2 +-
arch/xtensa/kernel/entry.S | 8 +-
drivers/acpi/processor_idle.c | 5 +-
drivers/cpuidle/cpuidle-psci.c | 8 +-
drivers/cpuidle/cpuidle-riscv-sbi.c | 8 +-
drivers/cpuidle/cpuidle.c | 9 +-
include/linux/context_tracking.h | 95 +--
include/linux/context_tracking_irq.h | 21 +
include/linux/context_tracking_state.h | 113 +++-
include/linux/entry-common.h | 10 +-
include/linux/hardirq.h | 12 +-
include/linux/rcupdate.h | 45 +-
include/linux/rcupdate_trace.h | 2 +-
include/linux/rcutiny.h | 27 +-
include/linux/rcutree.h | 11 +-
include/linux/sched.h | 4 +-
include/linux/tracepoint.h | 4 +-
init/Kconfig | 4 +-
init/init_task.c | 1 +
kernel/cfi.c | 4 +-
kernel/context_tracking.c | 617 +++++++++++++++++--
kernel/cpu_pm.c | 8 +-
kernel/entry/common.c | 16 +-
kernel/extable.c | 4 +-
kernel/fork.c | 1 +
kernel/locking/lockdep.c | 2 +-
kernel/rcu/Kconfig | 31 +
kernel/rcu/Kconfig.debug | 2 +-
kernel/rcu/rcu.h | 19 +-
kernel/rcu/rcuscale.c | 1 +
kernel/rcu/rcutorture.c | 247 +++++---
kernel/rcu/refscale.c | 18 +-
kernel/rcu/srcutree.c | 98 ++-
kernel/rcu/tasks.h | 541 ++++++++++-------
kernel/rcu/tiny.c | 25 +-
kernel/rcu/tree.c | 660 ++++++---------------
kernel/rcu/tree.h | 21 +-
kernel/rcu/tree_exp.h | 115 +++-
kernel/rcu/tree_nocb.h | 266 ++++++---
kernel/rcu/tree_plugin.h | 82 +--
kernel/rcu/tree_stall.h | 55 +-
kernel/rcu/update.c | 15 +-
kernel/sched/core.c | 34 +-
kernel/sched/idle.c | 10 +-
kernel/sched/sched.h | 1 +
kernel/smp.c | 4 +-
kernel/softirq.c | 4 +-
kernel/time/Kconfig | 37 +-
kernel/time/tick-sched.c | 2 +-
kernel/trace/trace.c | 8 +-
.../selftests/rcutorture/bin/kvm-check-branches.sh | 11 +-
.../testing/selftests/rcutorture/bin/kvm-remote.sh | 1 +
tools/testing/selftests/rcutorture/bin/kvm.sh | 6 +-
77 files changed, 2216 insertions(+), 1303 deletions(-)
create mode 100644 include/linux/context_tracking_irq.h

Next message: pr-tracker-bot: "Re: [GIT PULL] clk fixes for v5.19-rc8"
Previous message: Linus Torvalds: "Re: [PATCH v2] make buffer_locked provide an acquire semantics"
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