linux-kernel - Re: [PATCH] rust: make `UnsafeCell` the outer type in `Opaque`

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Message-ID: <CANiq72kVzySOqeWpK0+wn3gn-wOHUhm0TcSxdsr71eFsN3bnnA@mail.gmail.com>
Date:   Thu, 10 Aug 2023 01:21:33 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Alice Ryhl <aliceryhl@...gle.com>
Cc:     rust-for-linux@...r.kernel.org, Miguel Ojeda <ojeda@...nel.org>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        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 <benno.lossin@...ton.me>,
        linux-kernel@...r.kernel.org, patches@...ts.linux.dev
Subject: Re: [PATCH] rust: make `UnsafeCell` the outer type in `Opaque`

On Wed, Jun 14, 2023 at 1:53 PM Alice Ryhl <aliceryhl@...gle.com> wrote:
>
> When combining `UnsafeCell` with `MaybeUninit`, it is idiomatic to use
> `UnsafeCell` as the outer type. Intuitively, this is because a
> `MaybeUninit<T>` might not contain a `T`, but we always want the effect
> of the `UnsafeCell`, even if the inner value is uninitialized.
>
> Now, strictly speaking, this doesn't really make a difference. The
> compiler will always apply the `UnsafeCell` effect even if the inner
> value is uninitialized. But I think we should follow the convention
> here.
>
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>

Applied to `rust-next`, thanks everyone!

Cheers,
Miguel