linux-kernel - [PATCH v2 09/12] rust: init: implement Zeroable for Opaque<T>

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Message-ID: <20230719141918.543938-10-benno.lossin@proton.me>
Date:   Wed, 19 Jul 2023 14:21:06 +0000
From:   Benno Lossin <benno.lossin@...ton.me>
To:     Miguel Ojeda <ojeda@...nel.org>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Alex Gaynor <alex.gaynor@...il.com>
Cc:     Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Benno Lossin <benno.lossin@...ton.me>,
        Alice Ryhl <aliceryhl@...gle.com>,
        Andreas Hindborg <nmi@...aspace.dk>,
        rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 09/12] rust: init: implement Zeroable for Opaque<T>

Since `Opaque<T>` contains a `MaybeUninit<T>`, all bytes zero is a valid
bit pattern for that type.

Signed-off-by: Benno Lossin <benno.lossin@...ton.me>
---
 rust/kernel/types.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/rust/kernel/types.rs b/rust/kernel/types.rs
index d849e1979ac7..f0f540578d0f 100644
--- a/rust/kernel/types.rs
+++ b/rust/kernel/types.rs
@@ -11,6 +11,7 @@
     ops::{Deref, DerefMut},
     ptr::NonNull,
 };
+use macros::Zeroable;
 
 /// Used to transfer ownership to and from foreign (non-Rust) languages.
 ///
@@ -251,6 +252,7 @@ fn drop(&mut self) {
 ///
 /// This is meant to be used with FFI objects that are never interpreted by Rust code.
 #[repr(transparent)]
+#[derive(Zeroable)]
 pub struct Opaque<T> {
     value: UnsafeCell<MaybeUninit<T>>,
     _pin: PhantomPinned,
-- 
2.41.0