mirror of
https://github.com/torvalds/linux.git
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a7f2bc8787
Execution contexts and call_rcu() and call_srcu():
* Make call_rcu() and call_srcu invocable from NMI handlers and while
holding scheduler locks (using irq-work handlers).
* Add rcutorture and BPF tests calling these functions from these
contexts.
* Disable rcutorture overload testing for RCU readers that are "fragile",
that is, that do not either disable preemption or have some form of
RCU priority boosting.
SRCU updates:
* Add an atomic SRCU where readers run with preemption disabled and
grace periods can be invoked from atomic contexts. David Woodhouse
has a patch series exploiting this for GPC.
* Add torture and lockdep tests for atomic SRCU.
* Add numerous optimizations for atomic SRCU based on the fact that it
does not have callbacks, for example, eliminating any transition to
"big" srcu_struct structures even on systems that configure these to
happen at initialization time.
Additional torture-test updates:
* Fix a divide-by-zero bug in forward-progress testing.
* Synchronously wait for all IRQ-queued callbacks to complete.
* Allow alternative "ssh" commands to be specified for use by
kvm-remote.sh.
* Fix kvm-again.sh re-run failure on PowerPC.
* Add additional lockdep testing for atomic SRCU.
* Fix error double-counting in srcu_lockdep.sh.
* Add atomic SRCU cross-CPU IRQ context mismatch testing, with the
* trick being that the atomic SRCU readers context must be at least as
strict as that of the atomic SRCU grace-period wait. So for example,
if the readers have IRQs disabled, so must the grace-period wait.
Miscellaneous updates:
* Update stallwarn.rst documentation for the re-implementation of RCU
Tasks Trace in terms of SRCU.
* Fix the lazy-callback shrink scanner budget computation so that it
honors the reclaim budget.
* Avoid panicking on RCU CPU stalls that end before the warning can
be printed.
* Add "running" and "boosted" indications to the RCU task stall warning
output.
* People have been (incorrectly) relying on rcu_barrier() to wait for
kfree_rcu() callbacks and processing. But it turns out to be easier to
fix rcu_barrier() to meet their expectations than to fix their code to
live within the earlier rcu_barrier() specification. So rcu_barrier()
now waits on kfree_rcu() callbacks and processing.
* Disable RCU Tasks console output that track when this RCU flavor
switches between per-CPU and global callback queuing. New use cases
appeared that generated enough console traffic to cause trouble, and
no one seemed to care about these messages. For those needing those
messages, there is a new rcupdate.rcu_task_collapse_debug kernel boot
parameter.
* Fix __rcu pointer attribute handling to eliminate false positives.
* Fix typos and drop redundant #include directives.
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Merge tag 'rcu.2026.10.12b' of git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux
Pull RCU updates from Paul McKenney:
"Execution contexts and call_rcu() and call_srcu():
- Make call_rcu() and call_srcu invocable from NMI handlers and while
holding scheduler locks (using irq-work handlers)
- Add rcutorture and BPF tests calling these functions from these
contexts
- Disable rcutorture overload testing for RCU readers that are
"fragile", that is, that do not either disable preemption or have
some form of RCU priority boosting
SRCU updates:
- Add an atomic SRCU where readers run with preemption disabled and
grace periods can be invoked from atomic contexts. David Woodhouse
has a patch series exploiting this for GPC
- Add torture and lockdep tests for atomic SRCU
- Add numerous optimizations for atomic SRCU based on the fact that
it does not have callbacks, for example, eliminating any transition
to "big" srcu_struct structures even on systems that configure
these to happen at initialization time
Additional torture-test updates:
- Fix a divide-by-zero bug in forward-progress testing
- Synchronously wait for all IRQ-queued callbacks to complete
- Allow alternative "ssh" commands to be specified for use by
kvm-remote.sh
- Fix kvm-again.sh re-run failure on PowerPC
- Add additional lockdep testing for atomic SRCU
- Fix error double-counting in srcu_lockdep.sh
- Add atomic SRCU cross-CPU IRQ context mismatch testing, with the
- trick being that the atomic SRCU readers context must be at least
as strict as that of the atomic SRCU grace-period wait. So for
example, if the readers have IRQs disabled, so must the
grace-period wait
Miscellaneous updates:
- Update stallwarn.rst documentation for the re-implementation of RCU
Tasks Trace in terms of SRCU
- Fix the lazy-callback shrink scanner budget computation so that it
honors the reclaim budget
- Avoid panicking on RCU CPU stalls that end before the warning can
be printed
- Add "running" and "boosted" indications to the RCU task stall
warning output
- People have been (incorrectly) relying on rcu_barrier() to wait for
kfree_rcu() callbacks and processing. But it turns out to be easier
to fix rcu_barrier() to meet their expectations than to fix their
code to live within the earlier rcu_barrier() specification. So
rcu_barrier() now waits on kfree_rcu() callbacks and processing
- Disable RCU Tasks console output that track when this RCU flavor
switches between per-CPU and global callback queuing. New use cases
appeared that generated enough console traffic to cause trouble,
and no one seemed to care about these messages. For those needing
those messages, there is a new rcupdate.rcu_task_collapse_debug
kernel boot parameter
- Fix __rcu pointer attribute handling to eliminate false positives
- Fix typos and drop redundant #include directives"
* tag 'rcu.2026.10.12b' of git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux: (46 commits)
rcutorture: Add atomic SRCU cross-CPU IRQ context mismatch test
selftests/rcutorture: Fix double nerrs count in srcu_lockdep.sh
selftests/rcutorture: Wire atomic SRCU into srcu_lockdep.sh
rcutorture: Add atomic SRCU lockdep support
rcutorture: Fix kvm-again.sh re-run failure on ppc64
torture: Allow specifying alternative ssh command to kvm-remote.sh
rcutorture: Synchronously wait for all rcu_torture_irq() callbacks to complete
rcutorture: Fix divide-by-zero with fwd_progress_div=1
srcutree: Preserve IRQ state in synchronize_srcu_atomic() callchain
srcutiny: Add lockdep and early-boot checks to synchronize_srcu_atomic()
srcutree: Add lockdep and early-boot checks to synchronize_srcu_atomic()
srcutree: Skip torture to-big transition for atomic SRCU
srcutree: Don't transition atomic SRCU to big in srcu_gp_end()
srcutree: Make init_srcu_struct_atomic() prevent transition to big
srcu: Restrict atomic-SRCU non_block annotation to task context
srcutree: Remove srcu_barrier() sleep for atomic SRCU
srcutree: Skip callback scheduling for atomic SRCU grace periods
srcutree: Add reader-free fastpath to synchronize_srcu_atomic()
rcutorture: Add atomic-SRCU support to torture.sh
srcutree: Explicitly note DEFINE_SRCU() needs for srcu_barrier()
...
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| Kbuild | ||