This adds a token for annotating contexts where IRQs may be disabled on
non-PREEMPT_RT kernels, a way to use these tokens with Lock types, and
introduces bindings for spin_lock_irqsave() and
spin_unlock_irqrestore().

This patch series depends on the NotThreadSafe type from Alice:

https://lore.kernel.org/rust-for-linux/20240808-alice-file-v9-1-2cb7b934e0e1@google.com/

(Please re-review, since there's been some changes here!)

Lyude Paul (3):
  rust: Introduce local_irq module
  rust: sync: Introduce lock::Backend::Context and
    lock::BackendWithContext
  rust: sync: Add SpinLockIrq

 rust/helpers/helpers.c            |   1 +
 rust/helpers/irq.c                |   8 ++
 rust/helpers/spinlock.c           |  14 +++
 rust/kernel/lib.rs                |   1 +
 rust/kernel/local_irq.rs          |  56 +++++++++++
 rust/kernel/sync.rs               |   2 +-
 rust/kernel/sync/lock.rs          | 118 ++++++++++++++++++++++-
 rust/kernel/sync/lock/mutex.rs    |   1 +
 rust/kernel/sync/lock/spinlock.rs | 150 ++++++++++++++++++++++++++++++
 9 files changed, 345 insertions(+), 6 deletions(-)
 create mode 100644 rust/helpers/irq.c
 create mode 100644 rust/kernel/local_irq.rs


base-commit: 6ce162a002657910104c7a07fb50017681bc476c
prerequisite-patch-id: 4e3cfb97c9dc94e99912e67f383497848ac6f81d
-- 
2.47.0