linux-kernel - [PATCH 3/8] rust: pin-init: Implement `Wrapper` for `UnsafePinned` behind feature flag.

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Message-ID: <20250421221728.528089-4-benno.lossin@proton.me>
Date: Mon, 21 Apr 2025 22:18:06 +0000
From: Benno Lossin <benno.lossin@...ton.me>
To: Benno Lossin <benno.lossin@...ton.me>, 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>, Andreas Hindborg <a.hindborg@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, Danilo Krummrich <dakr@...nel.org>, Fiona Behrens <me@...enk.dev>, Christian Schrefl <chrisi.schrefl@...il.com>
Cc: rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/8] rust: pin-init: Implement `Wrapper` for `UnsafePinned` behind feature flag.

From: Christian Schrefl <chrisi.schrefl@...il.com>

Add the `unsafe-pinned` feature which gates the `Wrapper`
implementation of the `core::pin::UnsafePinned` struct.

For now this is just a cargo feature, but once `core::pin::UnsafePinned`
is stable a config flag can be added to allow the usage of this
implementation in the linux kernel.

Signed-off-by: Christian Schrefl <chrisi.schrefl@...il.com>
Link: https://github.com/Rust-for-Linux/pin-init/pull/37/commits/99cb1934425357e780ea5b0628f66633123847b8
[ Fixed commit authorship. - Benno ]
Signed-off-by: Benno Lossin <benno.lossin@...ton.me>
---
 rust/pin-init/src/lib.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/rust/pin-init/src/lib.rs b/rust/pin-init/src/lib.rs
index 467ccc8bd616..745cf534d239 100644
--- a/rust/pin-init/src/lib.rs
+++ b/rust/pin-init/src/lib.rs
@@ -269,6 +269,10 @@
 #![forbid(missing_docs, unsafe_op_in_unsafe_fn)]
 #![cfg_attr(not(feature = "std"), no_std)]
 #![cfg_attr(feature = "alloc", feature(allocator_api))]
+#![cfg_attr(
+    all(feature = "unsafe-pinned", CONFIG_RUSTC_HAS_UNSAFE_PINNED),
+    feature(unsafe_pinned)
+)]

 use core::{
     cell::UnsafeCell,
@@ -1557,3 +1561,11 @@ fn pin_init<E>(value_init: impl PinInit<T, E>) -> impl PinInit<Self, E> {
         unsafe { cast_pin_init(value_init) }
     }
 }
+
+#[cfg(all(feature = "unsafe-pinned", CONFIG_RUSTC_HAS_UNSAFE_PINNED))]
+impl<T> Wrapper<T> for core::pin::UnsafePinned<T> {
+    fn pin_init<E>(init: impl PinInit<T, E>) -> impl PinInit<Self, E> {
+        // SAFETY: `UnsafePinned<T>` has a compatible layout to `T`.
+        unsafe { cast_pin_init(init) }
+    }
+}
-- 
2.48.1