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rust: pin-init: Implement Wrapper for UnsafePinned behind feature flag.

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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@gmail.com>
Link: 99cb193442
[ Fixed commit authorship. - Benno ]
Signed-off-by: Benno Lossin <benno.lossin@proton.me>
This commit is contained in:
Christian Schrefl
2025-04-21 22:18:06 +00:00
committed by Benno Lossin
parent 2f7c73825f
commit b862aac8fd
1 changed files with 12 additions and 0 deletions
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12
rust/pin-init/src/lib.rs
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@@ -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) }
}
}