linux-kernel - [RFC RESEND v10 13/14] rust: sync: lock/global: Add BackendInContext support to GlobalLock

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Message-ID: <20250527222254.565881-14-lyude@redhat.com>
Date: Tue, 27 May 2025 18:21:54 -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: Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Will Deacon <will@...nel.org>,
	Waiman Long <longman@...hat.com>,
	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>
Subject: [RFC RESEND v10 13/14] rust: sync: lock/global: Add BackendInContext support to GlobalLock

Now that we have the ability to provide an explicit lifetime for a
GlobalGuard and an explicit Backend for a GlobalGuard, we can finally
implement lock_with() and try_lock_with().

Signed-off-by: Lyude Paul <lyude@...hat.com>
---
 rust/kernel/sync/lock/global.rs | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/rust/kernel/sync/lock/global.rs b/rust/kernel/sync/lock/global.rs
index 1678655faae32..108b15f4466f5 100644
--- a/rust/kernel/sync/lock/global.rs
+++ b/rust/kernel/sync/lock/global.rs
@@ -89,6 +89,34 @@ pub fn try_lock(&'static self) -> Option<GlobalGuard<'static, G, G::Backend>> {
             inner: self.inner.try_lock()?,
         })
     }
+
+    /// Lock this global lock with the provided `context`.
+    pub fn lock_with<B>(
+        &'static self,
+        context: <G::Backend as Backend>::Context<'a>,
+    ) -> GlobalGuard<'a, G, B>
+    where
+        G::Backend: Backend<BackendInContext = B>,
+        B: Backend,
+    {
+        GlobalGuard {
+            inner: self.inner.lock_with(context),
+        }
+    }
+
+    /// Try to lock this global lock with the provided `context`.
+    pub fn try_lock_with<B>(
+        &'static self,
+        context: <G::Backend as Backend>::Context<'a>,
+    ) -> Option<GlobalGuard<'a, G, B>>
+    where
+        G::Backend: Backend<BackendInContext = B>,
+        B: Backend,
+    {
+        Some(GlobalGuard {
+            inner: self.inner.try_lock_with(context)?,
+        })
+    }
 }
 
 /// A guard for a [`GlobalLock`].
-- 
2.49.0