linux-kernel - [PATCH v2 1/5] rust: macros: allow conversion from `&T` to `TokenStream`

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Message-Id: <e349e0146bb4085b04245253e5e17c6275e14e31.1755235180.git.y.j3ms.n@gmail.com>
Date: Fri, 15 Aug 2025 05:32:11 +0000
From: Jesung Yang <y.j3ms.n@...il.com>
To: Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	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>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>,
	Alexandre Courbot <acourbot@...dia.com>
Cc: linux-kernel@...r.kernel.org,
	rust-for-linux@...r.kernel.org,
	nouveau@...ts.freedesktop.org,
	Jesung Yang <y.j3ms.n@...il.com>
Subject: [PATCH v2 1/5] rust: macros: allow conversion from `&T` to `TokenStream`

Implement the `ToTokens` trait for `&T` where `T` implements `ToTokens`.
This allows users to use the `quote!()` macro with references directly,
avoiding the need to clone values.

Tested-by: Alexandre Courbot <acourbot@...dia.com>
Signed-off-by: Jesung Yang <y.j3ms.n@...il.com>
---
 rust/macros/quote.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/rust/macros/quote.rs b/rust/macros/quote.rs
index 92cacc4067c9..8a89f0b1e785 100644
--- a/rust/macros/quote.rs
+++ b/rust/macros/quote.rs
@@ -7,6 +7,12 @@ pub(crate) trait ToTokens {
     fn to_tokens(&self, tokens: &mut TokenStream);
 }
 
+impl<T: ToTokens> ToTokens for &T {
+    fn to_tokens(&self, tokens: &mut TokenStream) {
+        (*self).to_tokens(tokens);
+    }
+}
+
 impl<T: ToTokens> ToTokens for Option<T> {
     fn to_tokens(&self, tokens: &mut TokenStream) {
         if let Some(v) = self {
-- 
2.39.5