linux-kernel - Re: [PATCH 3/9] rust: list: add struct with prev/next pointers

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Date: Fri, 05 Apr 2024 09:47:28 +0000
From: Benno Lossin <benno.lossin@...ton.me>
To: Alice Ryhl <aliceryhl@...gle.com>, Miguel Ojeda <ojeda@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>
Cc: Alex Gaynor <alex.gaynor@...il.com>, Wedson Almeida Filho <wedsonaf@...il.com>, Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, Björn Roy Baron <bjorn3_gh@...tonmail.com>, Andreas Hindborg <a.hindborg@...sung.com>, Marco Elver <elver@...gle.com>, Kees Cook <keescook@...omium.org>, Coly Li <colyli@...e.de>, Paolo Abeni <pabeni@...hat.com>, Pierre Gondois <pierre.gondois@....com>, Ingo Molnar <mingo@...nel.org>, Jakub Kicinski <kuba@...nel.org>, Wei Yang <richard.weiyang@...il.com>, Matthew Wilcox <willy@...radead.org>, linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org
Subject: Re: [PATCH 3/9] rust: list: add struct with prev/next pointers

On 02.04.24 14:17, Alice Ryhl wrote:
> +impl<const ID: u64> ListLinks<ID> {
> +    /// Creates a new initializer for this type.
> +    pub fn new() -> impl PinInit<Self> {
> +        // INVARIANT: Pin-init initializers can't be used on an existing `Arc`, so this value will
> +        // not be constructed in an `Arc` that already has a `ListArc`.
> +        ListLinks {
> +            inner: Opaque::new(ListLinksFields {
> +                prev: ptr::null_mut(),
> +                next: ptr::null_mut(),
> +            }),

You might want to implement `Zeroable` (using the derive macro) for this
struct, since then you could just return `init::zeroed()`.
You can also use that for the `ListLinksSelfPtr` in the other patch.

-- 
Cheers,
Benno

> +        }
> +    }
> +}
> 
> --
> 2.44.0.478.gd926399ef9-goog
>