linux-kernel - [PATCH RFC 4/7] rust: pin-init: allow `dead

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Message-Id: <20251216-nova-unload-v1-4-6a5d823be19d@nvidia.com>
Date: Tue, 16 Dec 2025 14:13:30 +0900
From: Alexandre Courbot <acourbot@...dia.com>
To: Danilo Krummrich <dakr@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Bjorn Helgaas <bhelgaas@...gle.com>, 
 Krzysztof Wilczyński <kwilczynski@...nel.org>, 
 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>
Cc: John Hubbard <jhubbard@...dia.com>, 
 Alistair Popple <apopple@...dia.com>, 
 Joel Fernandes <joelagnelf@...dia.com>, Timur Tabi <ttabi@...dia.com>, 
 Edwin Peer <epeer@...dia.com>, Eliot Courtney <ecourtney@...dia.com>, 
 nouveau@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, 
 linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org, 
 rust-for-linux@...r.kernel.org, Alexandre Courbot <acourbot@...dia.com>
Subject: [PATCH RFC 4/7] rust: pin-init: allow `dead_code` on projection
 structure

Projection structures are not necessarily (and often not) used in their
entirety. At the moment partial uses result in warnings about the unused
members.

Discard them by allowing `dead_code` on the projection structure

To: Benno Lossin <lossin@...nel.org>
Signed-off-by: Alexandre Courbot <acourbot@...dia.com>

---
Benno, please let me know if this looks good to you and I will send you
a Github PR for this.
---
 rust/pin-init/src/macros.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/rust/pin-init/src/macros.rs b/rust/pin-init/src/macros.rs
index 682c61a587a0..fe60e570c729 100644
--- a/rust/pin-init/src/macros.rs
+++ b/rust/pin-init/src/macros.rs
@@ -1004,6 +1004,7 @@ fn drop(&mut self) {
         @not_pinned($($(#[$($attr:tt)*])* $fvis:vis $field:ident : $type:ty),* $(,)?),
     ) => {
         $crate::macros::paste! {
+            #[allow(dead_code)]
             #[doc(hidden)]
             $vis struct [< $name Projection >] <'__pin, $($decl_generics)*> {
                 $($(#[$($p_attr)*])* $pvis $p_field : ::core::pin::Pin<&'__pin mut $p_type>,)*

-- 
2.52.0