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Message-ID: <20250519203540.GA3639139@joelnvbox>
Date: Mon, 19 May 2025 16:35:40 -0400
From: Joel Fernandes <joelagnelf@...dia.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: "Paul E. McKenney" <paulmck@...nel.org>,
Frederic Weisbecker <frederic@...nel.org>,
Neeraj Upadhyay <neeraj.upadhyay@...nel.org>,
Joel Fernandes <joel@...lfernandes.org>,
Boqun Feng <boqun.feng@...il.com>,
Uladzislau Rezki <urezki@...il.com>, linux-kernel@...r.kernel.org,
rcu@...r.kernel.org, qiang.zhang1211@...il.com
Subject: RCU changes for v6.16
Hi Linus,
When the merge window opens, please pull the RCU changes for v6.16:
The following changes since commit 0af2f6be1b4281385b618cb86ad946eded089ac8:
Linux 6.15-rc1 (2025-04-06 13:11:33 -0700)
are available in the Git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux.git tags/next.2025.05.17a
for you to fetch changes up to 9c80e443379861a6b374db3c5bb830167cbe0676:
Merge branches 'rcu/misc-for-6.16', 'rcu/seq-counters-for-6.16' and
'rcu/torture-for-6.16' into rcu/for-next (2025-05-16 11:18:16 -0400)
We in the RCU maintainers crew have done rigorous testing of these patches on
both x86 and ARM, big and small machines, to ensure high quality so I am
confident this will go smoothly. Thanks!
----------------------------------------------------------------
RCU pull request for v6.16
Summary of changes:
- Removed swake_up_one_online() workaround
- Reverted an incorrect rcuog wake-up fix from offline softirq
- Rust RCU Guard methods marked as inline
- Updated MAINTAINERS with Joel’s and Zqiang's new email address
- Replaced magic constant in rcu_seq_done_exact() with named constant
- Added warning mechanism to validate rcu_seq_done_exact()
- Switched SRCU polling API to use rcu_seq_done_exact()
- Commented on redundant delta check in rcu_seq_done_exact()
- Made ->gpwrap tests in rcutorture more frequent
- Fixed reuse of ARM64 images in rcutorture
- rcutorture improved to check Kconfig and reader conflict handling
- Extracted logic from rcu_torture_one_read() for clarity
- Updated LWN RCU API documentation links
- Enabled --do-rt in torture.sh for CONFIG_PREEMPT_RT
- Added tests for SRCU up/down reader primitives
- Added comments and delays checks in rcutorture
- Deprecated srcu_read_lock_lite() and srcu_read_unlock_lite() via checkpatch
- Added --do-normal and --do-no-normal to torture.sh
- Added RCU Rust binding tests to torture.sh
- Reduced CPU overcommit and removed MAXSMP/CPUMASK_OFFSTACK in TREE01
- Replaced kmalloc() with kcalloc() in rcuscale
- Refined listRCU example code for stale data elimination
- Fixed hardirq count bug for x86 in cpu_stall_cputime
- Added safety checks in rcu/nocb for offloaded rdp access
- Other miscellaneous changes
----------------------------------------------------------------
Frederic Weisbecker (3):
rcu: Comment on the extraneous delta test on rcu_seq_done_exact()
rcu: Remove swake_up_one_online() bandaid
Revert "rcu/nocb: Fix rcuog wake-up from offline softirq"
I Hsin Cheng (1):
rust: sync: rcu: Mark Guard methods as inline
Joel Fernandes (7):
MAINTAINERS: Update Joel's email address
rcu: Replace magic number with meaningful constant in rcu_seq_done_exact()
rcu: Add warning to ensure rcu_seq_done_exact() is working
srcu: Use rcu_seq_done_exact() for polling API
rcutorture: Perform more frequent testing of ->gpwrap
rcutorture: Fix issue with re-using old images on ARM64
Merge branches 'rcu/misc-for-6.16', 'rcu/seq-counters-for-6.16' and 'rcu/torture-for-6.16' into rcu/for-next
Paul E. McKenney (12):
rcutorture: Make srcu_lockdep.sh check kernel Kconfig
rcutorture: Make srcu_lockdep.sh check reader-conflict handling
rcutorture: Split out beginning and end from rcu_torture_one_read()
rcutorture: Make torture.sh --do-rt use CONFIG_PREEMPT_RT
doc: Update LWN RCU API links in whatisRCU.rst
rcutorture: Comment invocations of tick_dep_set_task()
checkpatch: Deprecate srcu_read_lock_lite() and srcu_read_unlock_lite()
torture: Add --do-{,no-}normal to torture.sh
torture: Add testing of RCU's Rust bindings to torture.sh
torture: Check for "Call trace:" as well as "Call Trace:"
rcutorture: Reduce TREE01 CPU overcommit
rcutorture: Remove MAXSMP and CPUMASK_OFFSTACK from TREE01
Su Hui (1):
rcuscale: using kcalloc() to relpace kmalloc()
Wei Yang (1):
doc/RCU/listRCU: refine example code for eliminating stale data
Yongliang Gao (1):
rcu/cpu_stall_cputime: fix the hardirq count for x86 architecture
Zqiang (2):
MAINTAINERS: Update Zqiang's email address
rcu/nocb: Add Safe checks for access offloaded rdp
Documentation/RCU/listRCU.rst | 10 +-
Documentation/RCU/whatisRCU.rst | 3 +
Documentation/admin-guide/kernel-parameters.txt | 25 +++
MAINTAINERS | 8 +-
kernel/rcu/rcu.h | 18 +-
kernel/rcu/rcuscale.c | 2 +-
kernel/rcu/rcutorture.c | 206 ++++++++++++++++-----
kernel/rcu/srcutree.c | 2 +-
kernel/rcu/tree.c | 84 +++++----
kernel/rcu/tree.h | 3 +-
kernel/rcu/tree_exp.h | 2 +-
kernel/rcu/tree_nocb.h | 10 +-
kernel/rcu/tree_plugin.h | 2 +-
kernel/rcu/tree_stall.h | 4 +-
rust/kernel/sync/rcu.rs | 5 +
scripts/checkpatch.pl | 2 +
.../selftests/rcutorture/bin/console-badness.sh | 2 +-
.../selftests/rcutorture/bin/kvm-test-1-run.sh | 2 +-
.../selftests/rcutorture/bin/parse-console.sh | 2 +-
.../selftests/rcutorture/bin/srcu_lockdep.sh | 42 ++++-
tools/testing/selftests/rcutorture/bin/torture.sh | 89 ++++++++-
.../selftests/rcutorture/configs/rcu/TREE01 | 2 -
.../selftests/rcutorture/configs/rcu/TREE01.boot | 2 +-
23 files changed, 403 insertions(+), 124 deletions(-)
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