linux-kernel - [RFC 4/5] rust: sync: Add MutexGuard type alias

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Message-Id: <20241128054022.19586-5-boqun.feng@gmail.com>
Date: Wed, 27 Nov 2024 21:40:21 -0800
From: Boqun Feng <boqun.feng@...il.com>
To: Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Miguel Ojeda <ojeda@...nel.org>
Cc: Will Deacon <will@...nel.org>,
	Waiman Long <longman@...hat.com>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <benno.lossin@...ton.me>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Lyude Paul <lyude@...hat.com>,
	Filipe Xavier <felipe_life@...e.com>,
	Boqun Feng <boqun.feng@...il.com>
Subject: [RFC 4/5] rust: sync: Add MutexGuard type alias

From: Lyude Paul <lyude@...hat.com>

A simple helper alias for code that needs to deal with Guard types returned
from Mutexes.

Signed-off-by: Lyude Paul <lyude@...hat.com>
Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>
Signed-off-by: Boqun Feng <boqun.feng@...il.com>
Link: https://lore.kernel.org/r/20241120222742.2490495-2-lyude@redhat.com
---
 rust/kernel/sync.rs            | 2 +-
 rust/kernel/sync/lock/mutex.rs | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/rust/kernel/sync.rs b/rust/kernel/sync.rs
index 1eab7ebf25fd..2721b5c8deda 100644
--- a/rust/kernel/sync.rs
+++ b/rust/kernel/sync.rs
@@ -16,7 +16,7 @@
 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};
+pub use lock::mutex::{new_mutex, Mutex, MutexGuard};
 pub use lock::spinlock::{new_spinlock, SpinLock};
 pub use locked_by::LockedBy;
 
diff --git a/rust/kernel/sync/lock/mutex.rs b/rust/kernel/sync/lock/mutex.rs
index 0e946ebefce1..10a70c07268d 100644
--- a/rust/kernel/sync/lock/mutex.rs
+++ b/rust/kernel/sync/lock/mutex.rs
@@ -86,6 +86,14 @@ macro_rules! new_mutex {
 /// [`struct mutex`]: srctree/include/linux/mutex.h
 pub type Mutex<T> = super::Lock<T, MutexBackend>;
 
+/// A [`Guard`] acquired from locking a [`Mutex`].
+///
+/// This is simply a type alias for a [`Guard`] returned from locking a [`Mutex`]. It will unlock
+/// the [`Mutex`] upon being dropped.
+///
+/// [`Guard`]: super::Guard
+pub type MutexGuard<'a, T> = super::Guard<'a, T, MutexBackend>;
+
 /// A kernel `struct mutex` lock backend.
 pub struct MutexBackend;
 
-- 
2.39.5 (Apple Git-154)