linux-kernel - [PATCH v17 15/16] rust: sync: lock/global: Add ContextualBackend support to GlobalLock

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Message-ID: <20260121223933.1568682-16-lyude@redhat.com>
Date: Wed, 21 Jan 2026 17:39:18 -0500
From: Lyude Paul <lyude@...hat.com>
To: rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Cc: Boqun Feng <boqun.feng@...il.com>,
	Daniel Almeida <daniel.almeida@...labora.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>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Will Deacon <will@...nel.org>,
	Waiman Long <longman@...hat.com>
Subject: [PATCH v17 15/16] rust: sync: lock/global: Add ContextualBackend 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 | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/rust/kernel/sync/lock/global.rs b/rust/kernel/sync/lock/global.rs
index 94f6b3b21324f..cfc71af7482ed 100644
--- a/rust/kernel/sync/lock/global.rs
+++ b/rust/kernel/sync/lock/global.rs
@@ -6,7 +6,7 @@
 
 use crate::{
     str::{CStr, CStrExt as _},
-    sync::lock::{Backend, Guard, Lock},
+    sync::lock::{Backend, BackendWithContext, Guard, Lock},
     sync::{LockClassKey, LockedBy},
     types::Opaque,
 };
@@ -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<'a, B>(
+        &'static self,
+        context: <G::Backend as BackendWithContext>::Context<'a>,
+    ) -> GlobalGuard<'a, G, B>
+    where
+        G::Backend: BackendWithContext<ContextualBackend = 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<'a, B>(
+        &'static self,
+        context: <G::Backend as BackendWithContext>::Context<'a>,
+    ) -> Option<GlobalGuard<'a, G, B>>
+    where
+        G::Backend: BackendWithContext<ContextualBackend = B>,
+        B: Backend,
+    {
+        Some(GlobalGuard {
+            inner: self.inner.try_lock_with(context)?,
+        })
+    }
 }
 
 /// A guard for a [`GlobalLock`].
-- 
2.52.0