DROP EVENTUALLY: rust: sync: Add SpinLockIrqGuard type alias

same for irq spinlocks. This will get dropped in the future since it's no
longer the solution that we're going to be going for upstream, but it is
taking forever for simple patches to be merged :(.

Signed-off-by: Lyude Paul <lyude@redhat.com>

rust/kernel/sync.rs

@@ -17,7 +17,14 @@ pub use arc::{Arc, ArcBorrow, UniqueArc};
 pub use condvar::{new_condvar, CondVar, CondVarTimeoutResult};
 pub use lock::global::{global_lock, GlobalGuard, GlobalLock, GlobalLockBackend, GlobalLockedBy};
 pub use lock::mutex::{new_mutex, Mutex, MutexGuard};
-pub use lock::spinlock::{new_spinlock, new_spinlock_irq, SpinLock, SpinLockGuard, SpinLockIrq};
+pub use lock::spinlock::{
+    new_spinlock,
+    new_spinlock_irq,
+    SpinLock,
+    SpinLockGuard,
+    SpinLockIrq,
+    SpinLockIrqGuard,
+};
 pub use locked_by::LockedBy;
 
 /// Represents a lockdep class. It's a wrapper around C's `lock_class_key`.

rust/kernel/sync/lock/spinlock.rs

@@ -216,6 +216,14 @@ pub use new_spinlock_irq;
 /// ```
 pub type SpinLockIrq<T> = super::Lock<T, SpinLockIrqBackend>;
 
+/// A [`Guard`] acquired from locking a [`SpinLockIrq`].
+///
+/// This is simply a type alias for a [`Guard`] returned from locking a [`SpinLockIrq`]. It will
+/// unlock the [`SpinLockIrq`] upon being dropped.
+///
+/// [`Guard`]: super::Guard
+pub type SpinLockIrqGuard<'a, T: ?Sized> = super::Guard<'a, T, SpinLockIrqBackend>;
+
 /// A kernel `spinlock_t` lock backend that is acquired in no-irq contexts.
 pub struct SpinLockIrqBackend;