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Message-ID: <20230412143512.GA1697547@google.com>
Date: Wed, 12 Apr 2023 14:35:12 +0000
From: Joel Fernandes <joel@...lfernandes.org>
To: torvalds@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org, kernel-team@...a.com,
mingo@...nel.org, tglx@...utronix.de, rcu@...r.kernel.org,
joel@...lfernandes.org, boqun.feng@...il.com, frederic@...nel.org,
quic_neeraju@...cinc.com, urezki@...il.com, qiang1.zhang@...el.com,
rostedt@...dmis.org
Subject: [GIT PULL] RCU changes for v6.4
Hello, Linus,
The following changes since commit fe15c26ee26efa11741a7b632e9f23b01aca4cc6:
Linux 6.3-rc1 (2023-03-05 14:52:03 -0800)
are available in the Git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git tags/rcu.6.4.april5.2023.3
for you to fetch changes up to 8ae99857748bece993962dd8d04e096f9e76731f:
Merge branches 'rcu/staging-core', 'rcu/staging-docs' and 'rcu/staging-kfree', remote-tracking branches 'paul/srcu-cf.2023.04.04a', 'fbq/rcu/lockdep.2023.03.27a' and 'fbq/rcu/rcutorture.2023.03.20a' into rcu/staging (2023-04-05 13:50:37 +0000)
Highlights of RCU changes for 6.4 include:
1. Updates and additions to MAINTAINERS files, with Boqun being added to the
RCU entry and Zqiang being added as an RCU reviewer. I have also
transitioned from reviewer to maintainer; however, Paul will be taking
over sending RCU pull-requests for the next merge window.
2. Resolution of hotplug warning in nohz code, achieved by fixing
cpu_is_hotpluggable() through interaction with the nohz subsystem.
Tick dependency modifications by Zqiang, focusing on fixing usage of the
TICK_DEP_BIT_RCU_EXP bitmask.
3. Avoid needless calls to the rcu-lazy shrinker for CONFIG_RCU_LAZY=n kernels,
fixed by Zqiang.
4. Improvements to rcu-tasks stall reporting by Neeraj.
5. Initial renaming of k[v]free_rcu() to k[v]free_rcu_mightsleep() for
increased robustness, affecting several components like mac802154, drbd,
vmw_vmci, tracing, and more. A report [1] by Eric Dumazet showed that the
API could be unknowingly used in an atomic context, so we'd rather make
sure they know what they're asking for by being explicit:
[1] https://lore.kernel.org/all/20221202052847.2623997-1-edumazet@google.com/
6. Documentation updates, including corrections to spelling, clarifications
in comments, and improvements to the srcu_size_state comments.
7. Better srcu_struct cache locality for readers, by adjusting the size of
srcu_struct in support of SRCU usage by Christoph Hellwig.
8. Teach lockdep to detect deadlocks between srcu_read_lock() vs
synchronize_srcu() contributed by Boqun. Previously lockdep could not
detect such deadlocks, now it can.
9. Integration of rcutorture and rcu-related tools, targeted for v6.4 from
Boqun's tree, featuring new SRCU deadlock scenarios, test_nmis module
parameter, and more.
10. Miscellaneous changes, various code cleanups and comment improvements.
Thank you for considering these RCU updates for the 6.4 release.
----------------------------------------------------------------
Bhaskar Chowdhury (1):
tools: rcu: Add usage function and check for argument
Boqun Feng (5):
locking/lockdep: Introduce lock_sync()
rcu: Annotate SRCU's update-side lockdep dependencies
locking: Reduce the number of locks in ww_mutex stress tests
locking/lockdep: Improve the deadlock scenario print for sync and read lock
MAINTAINERS: Add Boqun to RCU entry
Frederic Weisbecker (1):
rcu: Further comment and explain the state space of GP sequences
Joel Fernandes (Google) (7):
srcu: Clarify comments on memory barrier "E"
MAINTAINERS: Change Joel Fernandes from R: to M:
MAINTAINERS: Add Zqiang as a RCU reviewer
tick/nohz: Fix cpu_is_hotpluggable() by checking with nohz subsystem
mac802154: Rename kfree_rcu() to kvfree_rcu_mightsleep()
checkpatch: Error out if deprecated RCU API used
Merge branches 'rcu/staging-core', 'rcu/staging-docs' and 'rcu/staging-kfree', remote-tracking branches 'paul/srcu-cf.2023.04.04a', 'fbq/rcu/lockdep.2023.03.27a' and 'fbq/rcu/rcutorture.2023.03.20a' into rcu/staging
Neeraj Upadhyay (1):
rcu-tasks: Report stalls during synchronize_srcu() in rcu_tasks_postscan()
Paul E. McKenney (35):
rcutorture: Add test_nmis module parameter
rcutorture: Set CONFIG_BOOTPARAM_HOTPLUG_CPU0 to offline CPU 0
rcutorture: Make scenario TREE04 enable lazy call_rcu()
torture: Permit kvm-again.sh --duration to default to previous run
torture: Enable clocksource watchdog with "tsc=watchdog"
rcuscale: Move shutdown from wait_event() to wait_event_idle()
refscale: Move shutdown from wait_event() to wait_event_idle()
rcutorture: Add SRCU deadlock scenarios
rcutorture: Add RCU Tasks Trace and SRCU deadlock scenarios
rcutorture: Add srcu_lockdep.sh
rcu-tasks: Fix warning for unused tasks_rcu_exit_srcu
srcu: Add whitespace to __SRCU_STRUCT_INIT() & __DEFINE_SRCU()
srcu: Use static init for statically allocated in-module srcu_struct
srcu: Begin offloading srcu_struct fields to srcu_update
srcu: Move ->level from srcu_struct to srcu_usage
srcu: Move ->srcu_size_state from srcu_struct to srcu_usage
srcu: Move ->srcu_cb_mutex from srcu_struct to srcu_usage
srcu: Move ->lock initialization after srcu_usage allocation
srcu: Move ->lock from srcu_struct to srcu_usage
srcu: Move ->srcu_gp_mutex from srcu_struct to srcu_usage
srcu: Move grace-period fields from srcu_struct to srcu_usage
srcu: Move heuristics fields from srcu_struct to srcu_usage
srcu: Move ->sda_is_static from srcu_struct to srcu_usage
srcu: Move srcu_barrier() fields from srcu_struct to srcu_usage
srcu: Move work-scheduling fields from srcu_struct to srcu_usage
srcu: Check for readers at module-exit time
srcu: Fix long lines in srcu_get_delay()
srcu: Fix long lines in cleanup_srcu_struct()
srcu: Fix long lines in srcu_gp_end()
srcu: Fix long lines in srcu_funnel_gp_start()
rcu: Add comment to rcu_do_batch() identifying rcuoc code path
rcu: Remove CONFIG_SRCU
mm: Remove "select SRCU"
kvm: Remove "select SRCU"
arch/x86: Remove "select SRCU"
Pingfan Liu (1):
srcu: Add comments for srcu_size_state
Qiuxu Zhuo (1):
Documentation/RCU: s/not/note/ in checklist.rst
Randy Dunlap (1):
Documentation: RCU: Correct spelling
Uladzislau Rezki (Sony) (9):
doc: Update whatisRCU.rst
drbd: Rename kvfree_rcu() to kvfree_rcu_mightsleep()
misc: vmw_vmci: Rename kvfree_rcu() to kvfree_rcu_mightsleep()
tracing: Rename kvfree_rcu() to kvfree_rcu_mightsleep()
lib/test_vmalloc.c: Rename kvfree_rcu() to kvfree_rcu_mightsleep()
net/sysctl: Rename kvfree_rcu() to kvfree_rcu_mightsleep()
net/mlx5: Rename kfree_rcu() to kfree_rcu_mightsleep()
ext4/super: Rename kfree_rcu() to kfree_rcu_mightsleep()
rcuscale: Rename kfree_rcu() to kfree_rcu_mightsleep()
Xu Panda (1):
rcu/trace: use strscpy() to instead of strncpy()
Yue Hu (1):
rcutorture: Eliminate variable n_rcu_torture_boost_rterror
Zheng Yejian (1):
rcu: Avoid stack overflow due to __rcu_irq_enter_check_tick() being kprobe-ed
Zqiang (7):
rcutorture: Create nocb kthreads only when testing rcu in CONFIG_RCU_NOCB_CPU=y kernels
rcu: Fix set/clear TICK_DEP_BIT_RCU_EXP bitmask race
rcu: Fix missing TICK_DEP_MASK_RCU_EXP dependency check
rcu: Register rcu-lazy shrinker only for CONFIG_RCU_LAZY=y kernels
rcu: Remove never-set needwake assignment from rcu_report_qs_rdp()
rcu: Permit start_poll_synchronize_rcu_expedited() to be invoked early
rcu: Protect rcu_print_task_exp_stall() ->exp_tasks access
.../Expedited-Grace-Periods.rst | 6 +-
.../Memory-Ordering/Tree-RCU-Memory-Ordering.rst | 2 +-
Documentation/RCU/RTFP.txt | 10 +-
Documentation/RCU/UP.rst | 4 +-
Documentation/RCU/checklist.rst | 2 +-
Documentation/RCU/lockdep.rst | 2 +-
Documentation/RCU/torture.rst | 4 +-
Documentation/RCU/whatisRCU.rst | 6 +-
MAINTAINERS | 4 +-
arch/arm64/kvm/Kconfig | 1 -
arch/mips/kvm/Kconfig | 1 -
arch/powerpc/kvm/Kconfig | 1 -
arch/riscv/kvm/Kconfig | 1 -
arch/s390/kvm/Kconfig | 1 -
arch/x86/Kconfig | 2 -
arch/x86/kvm/Kconfig | 1 -
drivers/base/cpu.c | 3 +-
drivers/block/drbd/drbd_nl.c | 6 +-
drivers/block/drbd/drbd_receiver.c | 4 +-
drivers/block/drbd/drbd_state.c | 2 +-
drivers/misc/vmw_vmci/vmci_context.c | 2 +-
drivers/misc/vmw_vmci/vmci_event.c | 2 +-
.../ethernet/mellanox/mlx5/core/en/tc/int_port.c | 2 +-
.../ethernet/mellanox/mlx5/core/en_accel/macsec.c | 4 +-
fs/ext4/super.c | 2 +-
include/linux/lockdep.h | 8 +-
include/linux/notifier.h | 5 +-
include/linux/srcu.h | 34 +-
include/linux/srcutiny.h | 6 +-
include/linux/srcutree.h | 94 +++--
include/linux/tick.h | 2 +
include/trace/events/rcu.h | 4 +-
include/trace/events/timer.h | 3 +-
kernel/locking/lockdep.c | 64 ++-
kernel/locking/test-ww_mutex.c | 2 +-
kernel/rcu/Kconfig | 3 -
kernel/rcu/rcu.h | 43 +-
kernel/rcu/rcuscale.c | 9 +-
kernel/rcu/rcutorture.c | 234 ++++++++++-
kernel/rcu/refscale.c | 2 +-
kernel/rcu/srcutiny.c | 2 +
kernel/rcu/srcutree.c | 438 ++++++++++++---------
kernel/rcu/tasks.h | 33 ++
kernel/rcu/tree.c | 18 +-
kernel/rcu/tree_exp.h | 16 +-
kernel/rcu/tree_nocb.h | 4 +
kernel/time/tick-sched.c | 16 +-
kernel/trace/trace_osnoise.c | 2 +-
kernel/trace/trace_probe.c | 2 +-
lib/test_vmalloc.c | 2 +-
mm/Kconfig | 1 -
net/core/sysctl_net_core.c | 4 +-
net/mac802154/scan.c | 4 +-
scripts/checkpatch.pl | 9 +
tools/rcu/extract-stall.sh | 26 +-
.../testing/selftests/rcutorture/bin/kvm-again.sh | 2 +-
.../selftests/rcutorture/bin/srcu_lockdep.sh | 78 ++++
tools/testing/selftests/rcutorture/bin/torture.sh | 6 +-
.../selftests/rcutorture/configs/rcu/TREE01 | 1 +
.../selftests/rcutorture/configs/rcu/TREE04 | 1 +
.../selftests/rcutorture/doc/TREE_RCU-kconfig.txt | 4 -
61 files changed, 915 insertions(+), 342 deletions(-)
mode change 100644 => 100755 tools/rcu/extract-stall.sh
create mode 100755 tools/testing/selftests/rcutorture/bin/srcu_lockdep.sh
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