linux-kernel - [RFC RESEND v10 11/14] rust: sync: Expose lock::Backend

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Message-ID: <20250527222254.565881-12-lyude@redhat.com>
Date: Tue, 27 May 2025 18:21:52 -0400
From: Lyude Paul <lyude@...hat.com>
To: rust-for-linux@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Boqun Feng <boqun.feng@...il.com>,
	linux-kernel@...r.kernel.org,
	Daniel Almeida <daniel.almeida@...labora.com>
Cc: Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Mitchell Levy <levymitchell0@...il.com>,
	Wedson Almeida Filho <wedsonaf@...il.com>
Subject: [RFC RESEND v10 11/14] rust: sync: Expose lock::Backend

Due to the addition of sync::lock::Backend::Context, lock guards can be
returned with a different Backend than their respective lock. Since we'll
be adding a trait bound for Backend to GlobalGuard in order to support
this, users will need to be able to directly refer to Backend so that they
can use it in trait bounds.

So, let's make this easier for users and expose Backend in sync.

Signed-off-by: Lyude Paul <lyude@...hat.com>
---
 rust/kernel/sync.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/rust/kernel/sync.rs b/rust/kernel/sync.rs
index 07e83992490d5..0d9c3353c8d69 100644
--- a/rust/kernel/sync.rs
+++ b/rust/kernel/sync.rs
@@ -23,6 +23,7 @@
 pub use lock::spinlock::{
     new_spinlock, new_spinlock_irq, SpinLock, SpinLockGuard, SpinLockIrq, SpinLockIrqGuard,
 };
+pub use lock::Backend;
 pub use locked_by::LockedBy;
 
 /// Represents a lockdep class. It's a wrapper around C's `lock_class_key`.
-- 
2.49.0