Hello Linus,
The following changes since commit f7345ccc62a4b880cf76458db5f320725f28e400:
rcu/nocb: Fix rcuog wake-up from offline softirq (2024-10-10 22:18:19 +0530)
are available in the Git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux.git tags/rcu.release.v6.13
for you to fetch changes up to d8dfba2c606ac9fa763ce3c51dcbf7335544b815:
Merge branches 'rcu/fixes', 'rcu/nocb', 'rcu/torture', 'rcu/stall' and 'rcu/srcu' into rcu/dev (2024-11-15 22:38:53 +0100)
----------------------------------------------------------------
RCU pull request for v6.13
SRCU:
- Introduction of the new SRCU-lite flavour with a new pair of
srcu_read_[un]lock_lite() APIs. In practice the read side using
this flavour becomes lighter by removing a full memory barrier on
LOCK and a full memory barrier on UNLOCK. This comes at the
expense of a higher latency write side with two (in the best case
of a snaphot of unused read-sides) or more RCU grace periods on
the update side which now assumes by itself the whole full
ordering guarantee against the LOCK/UNLOCK counters on both
indexes, along with the accesses performed inside.
Uretprobes is a known potential user.
Note this doesn't replace the default normal flavour of SRCU which
still behaves the same as usual.
- Add testing of SRCU-lite through rcutorture and rcuscale
- Various cleanups on the way.
FIXES:
- Allow short-circuiting RCU-TASKS-RUDE grace periods on architectures
that have sane noinstr boundaries forbidding tracing on low-level
idle and kernel entry code. RCU-TASKS is enough on such configurations
because it involves an RCU grace period that waits for all idle
tasks to either schedule out voluntarily or enter into RCU
unwatched noinstr code.
- Allow and test start_poll_synchronize_rcu() with IRQs disabled.
- Mention rcuog kthreads in relevant documentation and Kconfig help
- Various fixes and consolidations
RCUTORTURE:
- Add --no-affinity on tools to leave the affinity setting of guests
up to the user.
- Add guest_os_delay parameter to rcuscale for better warm-up
control.
- Fix and improve some rcuscale error handling.
- Various cleanups and fixes
STALL:
- Remove dead code
- Stop dumping tasks if a stalled grace period eventually ended
midway as that only produces confusing output.
- Optimize detection of stalling CPUs and avoid useless node
locking otherwise.
NOCB:
- Fix rcu_barrier() hang due to a race against callbacks
deoffloading. This is not yet used, except by rcutorture, and
waits for its promised cpusets interface.
- Remove leftover function declaration
----------------------------------------------------------------
Baruch Siach (1):
doc: rcu: update printed dynticks counter bits
Frederic Weisbecker (1):
Merge branches 'rcu/fixes', 'rcu/nocb', 'rcu/torture', 'rcu/stall' and 'rcu/srcu' into rcu/dev
Hongbo Li (1):
rcu: Use bitwise instead of arithmetic operator for flags
Jinjie Ruan (1):
rcu: Use the BITS_PER_LONG macro
Michal Schmidt (1):
rcu/srcutiny: don't return before reenabling preemption
Paul E. McKenney (32):
rcu: Delete unused rcu_gp_might_be_stalled() function
rcu: Stop stall warning from dumping stacks if grace period ends
srcu: Rename srcu_might_be_idle() to srcu_should_expedite()
srcu: Introduce srcu_gp_is_expedited() helper function
rcu: Finer-grained grace-period-end checks in rcu_dump_cpu_stacks()
srcu: Renaming in preparation for additional reader flavor
srcu: Bit manipulation changes for additional reader flavor
srcu: Standardize srcu_data pointers to "sdp" and similar
srcu: Improve srcu_read_lock{,_nmisafe}() comments
srcu: Create CPP macros for normal and NMI-safe SRCU readers
srcu: Add srcu_read_lock_lite() and srcu_read_unlock_lite()
srcu: Allow inlining of __srcu_read_{,un}lock_lite()
rcutorture: Expand RCUTORTURE_RDR_MASK_[12] to eight bits
rcutorture: Add reader_flavor parameter for SRCU readers
rcutorture: Add srcu_read_lock_lite() support to rcutorture.reader_flavor
rcutorture: Add light-weight SRCU scenario
refscale: Add srcu_read_lock_lite() support using "srcu-lite"
srcu: Improve srcu_read_lock_lite() kernel-doc comment
rcu: Add rcuog kthreads to RCU_NOCB_CPU help text
doc: Add rcuog kthreads to kernel-per-CPU-kthreads.rst
rcu: Allow short-circuiting of synchronize_rcu_tasks_rude()
rcu: Permit start_poll_synchronize_rcu*() with interrupts disabled
rcutorture: Test start-poll primitives with interrupts disabled
doc: Remove kernel-parameters.txt entry for rcutorture.read_exit
rcu-tasks: Remove open-coded one-byte cmpxchg() emulation
torture: Add --no-affinity parameter to kvm.sh
refscale: Correct affinity check
rcuscale: Add guest_os_delay module parameter
rcutorture: Avoid printing cpu=-1 for no-fault RCU boost failure
srcu: Remove smp_mb() from srcu_read_unlock_lite()
srcu: Check for srcu_read_lock_lite() across all CPUs
srcu: Unconditionally record srcu_read_lock_lite() in ->srcu_reader_flavor
Uladzislau Rezki (Sony) (3):
rcu/kvfree: Fix data-race in __mod_timer / kvfree_call_rcu
rcuscale: Do a proper cleanup if kfree_scale_init() fails
rcuscale: Remove redundant WARN_ON_ONCE() splat
Yue Haibing (1):
rcu: Remove unused declaration rcu_segcblist_offload()
Zhen Lei (1):
srcu: Replace WARN_ON_ONCE() with BUILD_BUG_ON() if possible
Zqiang (1):
rcu/nocb: Fix missed RCU barrier on deoffloading
Documentation/RCU/stallwarn.rst | 2 +-
Documentation/admin-guide/kernel-parameters.txt | 13 +-
.../admin-guide/kernel-per-CPU-kthreads.rst | 2 +-
include/linux/rcutiny.h | 1 -
include/linux/rcutree.h | 1 -
include/linux/srcu.h | 92 ++++++++++----
include/linux/srcutiny.h | 3 +
include/linux/srcutree.h | 67 ++++++++++-
kernel/rcu/Kconfig | 28 +++--
kernel/rcu/rcu_segcblist.h | 1 -
kernel/rcu/rcuscale.c | 8 +-
kernel/rcu/rcutorture.c | 84 +++++++++----
kernel/rcu/refscale.c | 56 ++++++++-
kernel/rcu/srcutiny.c | 2 +-
kernel/rcu/srcutree.c | 133 +++++++++++++--------
kernel/rcu/tasks.h | 20 +---
kernel/rcu/tree.c | 24 ++--
kernel/rcu/tree_nocb.h | 13 +-
kernel/rcu/tree_plugin.h | 22 ++--
kernel/rcu/tree_stall.h | 57 +++------
.../rcutorture/bin/kvm-test-1-run-batch.sh | 43 +++----
tools/testing/selftests/rcutorture/bin/kvm.sh | 6 +
.../selftests/rcutorture/configs/rcu/CFLIST | 1 +
.../selftests/rcutorture/configs/rcu/SRCU-L | 10 ++
.../selftests/rcutorture/configs/rcu/SRCU-L.boot | 3 +
.../selftests/rcutorture/configs/rcu/SRCU-N.boot | 1 +
.../selftests/rcutorture/configs/rcu/TREE10 | 2 +-
27 files changed, 468 insertions(+), 227 deletions(-)
create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/SRCU-L
create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/SRCU-L.boot
