Hi Peter,

Please take a look at the v3 of refcounted interrupt disabling.

Changes since v2:

- Fix NMI_OFFSET underflow issue reported by sashiko. See patch #1
  (__nmi_ext()) and #10 (__preempt_count_nmi_exit()) for details: we
  have to replace preempt_count_sub() with preempt_count_set().
- Add WARN_ON_ONCE(in_nmi()) in local_interrupt_disable() per Peter.
- Remove the use of should_resched() in local_interrupt_enable(), see
  patch #13.
- Remove my gmail in SoB.


v1: https://lore.kernel.org/rust-for-linux/20260508042111.24358-1-boqun@kernel.org/
v2: 

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
  irq: Optimize reschedule check in local_interrupt_enable()

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 (2):
  openrisc: Include <linux/cpumask.h> in smp.h
  irq: Add KUnit test for refcounted interrupt enable/disable

 arch/arm64/Kconfig                            |   1 +
 arch/arm64/include/asm/preempt.h              |  18 +++
 arch/openrisc/include/asm/smp.h               |   2 +
 arch/s390/Kconfig                             |   1 +
 arch/s390/include/asm/lowcore.h               |  13 ++-
 arch/s390/include/asm/preempt.h               |  49 ++++----
 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                       |  41 ++++++-
 include/linux/interrupt_rc.h                  |  76 ++++++++++++
 include/linux/kernel.h                        |   4 +-
 include/linux/preempt.h                       |  35 ++++--
 include/linux/spinlock.h                      |  49 +++++---
 include/linux/spinlock_api_smp.h              |  41 +++++++
 include/linux/spinlock_api_up.h               |  16 +++
 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                     |  29 +++++
 kernel/sched/core.c                           |  18 ++-
 kernel/softirq.c                              |  22 +++-
 lib/locking-selftest.c                        |   2 +-
 .../testing/selftests/bpf/bpf_experimental.h  |   7 +-
 26 files changed, 554 insertions(+), 80 deletions(-)
 create mode 100644 include/linux/interrupt_rc.h
 create mode 100644 kernel/irq/refcount_interrupt_test.c

-- 
2.51.0