[PATCH v12 00/15] Refcounted interrupts, SpinLockIrq for rust

[Lyude Paul <lyude@redhat.com>]

This is the latest patch series for adding rust bindings for controlling
local processor interrupts, adding support for spinlocks in rust that
are acquired with local processor interrupts disabled, and implementing
local interrupt controls through refcounting in the kernel.

The previous version of this patch series can be found here:

https://lkml.org/lkml/2025/5/27/1219

This patch series applies on top of the rust-next branch.

(The main difference from V11 is that I mistakenly squashed a patch that
shouldn't have been squashed in V11, so it has been unsquashed in V12.
Nothing else has changed since V11)

Boqun Feng (6):
  preempt: Introduce HARDIRQ_DISABLE_BITS
  preempt: Introduce __preempt_count_{sub, add}_return()
  irq & spin_lock: Add counted interrupt disabling/enabling
  rust: helper: Add spin_{un,}lock_irq_{enable,disable}() helpers
  rust: sync: lock: Add `Backend::BackendInContext`
  locking: Switch to _irq_{disable,enable}() variants in cleanup guards

Lyude Paul (9):
  irq: Add KUnit test for refcounted interrupt enable/disable
  rust: Introduce interrupt module
  rust: sync: Add SpinLockIrq
  rust: sync: Introduce lock::Backend::Context
  rust: sync: lock/global: Rename B to G in trait bounds
  rust: sync: Add a lifetime parameter to lock::global::GlobalGuard
  rust: sync: Expose lock::Backend
  rust: sync: lock/global: Add Backend parameter to GlobalGuard
  rust: sync: lock/global: Add BackendInContext support to GlobalLock

 arch/arm64/include/asm/preempt.h     |  18 ++
 arch/s390/include/asm/preempt.h      |  10 +
 arch/x86/include/asm/preempt.h       |  10 +
 include/asm-generic/preempt.h        |  14 ++
 include/linux/irqflags_types.h       |   6 +
 include/linux/preempt.h              |  20 +-
 include/linux/spinlock.h             |  88 +++++++--
 include/linux/spinlock_api_smp.h     |  27 +++
 include/linux/spinlock_api_up.h      |   8 +
 include/linux/spinlock_rt.h          |  15 ++
 kernel/irq/Makefile                  |   1 +
 kernel/irq/refcount_interrupt_test.c | 108 +++++++++++
 kernel/locking/spinlock.c            |  29 +++
 kernel/softirq.c                     |   3 +
 rust/helpers/helpers.c               |   1 +
 rust/helpers/interrupt.c             |  18 ++
 rust/helpers/spinlock.c              |  15 ++
 rust/helpers/sync.c                  |   5 +
 rust/kernel/interrupt.rs             |  86 +++++++++
 rust/kernel/lib.rs                   |   1 +
 rust/kernel/sync.rs                  |   5 +-
 rust/kernel/sync/lock.rs             |  69 ++++++-
 rust/kernel/sync/lock/global.rs      |  91 ++++++---
 rust/kernel/sync/lock/mutex.rs       |   2 +
 rust/kernel/sync/lock/spinlock.rs    | 272 +++++++++++++++++++++++++++
 25 files changed, 871 insertions(+), 51 deletions(-)
 create mode 100644 kernel/irq/refcount_interrupt_test.c
 create mode 100644 rust/helpers/interrupt.c
 create mode 100644 rust/kernel/interrupt.rs


base-commit: 23b128bba76776541dc09efaf3acf6242917e1f0
-- 
2.50.0