linux-kernel - [PATCH 1/2] rust: sync: add Arc::DATA

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Message-ID: <20251203-binder-trace1-v1-1-22d3ffddb44e@google.com>
Date: Wed, 03 Dec 2025 14:48:08 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Carlos Llamas <cmllamas@...gle.com>, 
	Steven Rostedt <rostedt@...dmis.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, 
	Miguel Ojeda <ojeda@...nel.org>, Boqun Feng <boqun.feng@...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>, Trevor Gross <tmgross@...ch.edu>, 
	Danilo Krummrich <dakr@...nel.org>, "Arve Hjønnevåg" <arve@...roid.com>, Todd Kjos <tkjos@...roid.com>, 
	Martijn Coenen <maco@...roid.com>, Joel Fernandes <joelagnelf@...dia.com>, 
	Christian Brauner <brauner@...nel.org>, Suren Baghdasaryan <surenb@...gle.com>, rust-for-linux@...r.kernel.org, 
	linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Alice Ryhl <aliceryhl@...gle.com>
Subject: [PATCH 1/2] rust: sync: add Arc::DATA_OFFSET

This constant will be used to expose some offset constants from the Rust
Binder driver to tracepoints which are implemented in C. The constant is
usually equal to sizeof(refcount_t), but may be larger if T has a large
alignment.

Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>
---
 rust/kernel/sync/arc.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/rust/kernel/sync/arc.rs b/rust/kernel/sync/arc.rs
index 289f77abf415a2a52e039a2c0291413eda01217c..921e19333b895f0d971591c4753047d0248a3029 100644
--- a/rust/kernel/sync/arc.rs
+++ b/rust/kernel/sync/arc.rs
@@ -240,6 +240,9 @@ pub fn new(contents: T, flags: Flags) -> Result<Self, AllocError> {
         // `Arc` object.
         Ok(unsafe { Self::from_inner(inner) })
     }
+
+    /// The offset that the value is stored at.
+    pub const DATA_OFFSET: usize = core::mem::offset_of!(ArcInner<T>, data);
 }
 
 impl<T: ?Sized> Arc<T> {

-- 
2.52.0.158.g65b55ccf14-goog