[PATCH v4 00/17] Refcounted interrupt disable and SpinLockIrq for Rust

[Boqun Feng]

Hi Peter & Ingo,

Please take a look at this updated series for SpinLockIrq.

Changes since the PR attempt [1]:

* Removed the preempt_count check in local_interrupt_enable() per Peter.
* Simplified the local_interrupt_disable_state struct to avoid
  unnecessary wrapper (Thanks Peter).
* Adjusted the user side changes in do_sched_cfs_*_timer().
* Improved the documentation on the preempt_count layout regarding
  HAS_SEPARATE_PREEMPT_RESCHED_BITS
* Updated the asm block comment for s390 (Thanks Heiko!).
* SoB chain/typo/format fixes.

(Lyude, I dropped the Link tags of your original patchset, since I did
some significant changes and let's just use the new links).

[1]: https://lore.kernel.org/rust-for-linux/20260731203031.13679-1-boqun@xxxxxxxxxx/

Thanks!

Regards,
Boqun

Boqun Feng (9):
  preempt: Introduce HARDIRQ_DISABLE_BITS
  preempt: Introduce __preempt_count_{sub,add}_return()
  irq & spin_lock: Add counted interrupt disabling/enabling
  locking: Switch to _irq_{disable,enable}() variants in cleanup guards
  sched: Remove the unused preempt_offset parameter of __cant_sleep()
  sched: Avoid signed comparison of preempt_count() in __cant_migrate()
  preempt: Introduce HAS_SEPARATE_PREEMPT_RESCHED_BITS
  arm64: sched/preempt: Enable HAS_SEPARATE_PREEMPT_RESCHED_BITS
  rust: helper: Add spin_{un,}lock_irq_{enable,disable}() helpers

Heiko Carstens (1):
  s390/preempt: Enable HAS_SEPARATE_PREEMPT_RESCHED_BITS

Joel Fernandes (1):
  preempt: Track NMI nesting to separate per-CPU counter

Lyude Paul (6):
  openrisc: Include <linux/cpumask.h> in smp.h
  irq: Add KUnit test for refcounted interrupt enable/disable
  rust: Introduce interrupt module
  rust: sync: Use super::* in spinlock.rs
  rust: sync: Add SpinLockIrq
  rust: sync: Introduce SpinLockIrq::lock_with() and friends

 arch/arm64/Kconfig                            |   1 +
 arch/arm64/include/asm/preempt.h              |  20 ++
 arch/openrisc/include/asm/smp.h               |   2 +
 arch/s390/Kconfig                             |   1 +
 arch/s390/include/asm/lowcore.h               |  13 +-
 arch/s390/include/asm/preempt.h               |  51 +--
 arch/x86/Kconfig                              |   1 +
 arch/x86/include/asm/preempt.h                |  61 +++-
 arch/x86/kernel/cpu/common.c                  |   2 +-
 include/asm-generic/preempt.h                 |  14 +
 include/linux/hardirq.h                       |  40 ++-
 include/linux/interrupt_rc.h                  |  82 +++++
 include/linux/kernel.h                        |   4 +-
 include/linux/preempt.h                       |  44 ++-
 include/linux/spinlock.h                      |  49 ++-
 include/linux/spinlock_api_smp.h              |  43 +++
 include/linux/spinlock_api_up.h               |  15 +
 include/linux/spinlock_rt.h                   |  18 +
 kernel/Kconfig.preempt                        |   4 +
 kernel/irq/Makefile                           |   1 +
 kernel/irq/refcount_interrupt_test.c          | 109 ++++++
 kernel/locking/spinlock.c                     |  31 ++
 kernel/sched/core.c                           |  18 +-
 kernel/sched/fair.c                           |  12 +-
 kernel/softirq.c                              |  36 +-
 lib/locking-selftest.c                        |   2 +-
 rust/helpers/helpers.c                        |   1 +
 rust/helpers/interrupt.c                      |  18 +
 rust/helpers/spinlock.c                       |  15 +
 rust/helpers/sync.c                           |   5 +
 rust/kernel/interrupt.rs                      |  89 +++++
 rust/kernel/lib.rs                            |   1 +
 rust/kernel/sync.rs                           |   9 +-
 rust/kernel/sync/lock/global.rs               |   3 +
 rust/kernel/sync/lock/spinlock.rs             | 329 +++++++++++++++++-
 .../testing/selftests/bpf/bpf_experimental.h  |   7 +-
 36 files changed, 1060 insertions(+), 91 deletions(-)
 create mode 100644 include/linux/interrupt_rc.h
 create mode 100644 kernel/irq/refcount_interrupt_test.c
 create mode 100644 rust/helpers/interrupt.c
 create mode 100644 rust/kernel/interrupt.rs

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