linux-kernel - Re: [PATCH RFC 01/11] rust: types: Add Opaque::zeroed()

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Date:   Sat, 15 Jul 2023 15:27:12 +0100
From:   Gary Guo <gary@...yguo.net>
To:     Asahi Lina <lina@...hilina.net>
Cc:     Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Benno Lossin <benno.lossin@...ton.me>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>, Tom Rix <trix@...hat.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Hector Martin <marcan@...can.st>,
        Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        asahi@...ts.linux.dev, rust-for-linux@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH RFC 01/11] rust: types: Add Opaque::zeroed()

On Fri, 14 Jul 2023 18:13:53 +0900
Asahi Lina <lina@...hilina.net> wrote:

> Opaque types are internally MaybeUninit, so it's safe to actually
> zero-initialize them as long as we don't claim they are initialized.
> This is useful for many FFI types that are expected to be zero-inited by
> the user.
> 
> Signed-off-by: Asahi Lina <lina@...hilina.net>

Reviewed-by: Gary Guo <gary@...yguo.net>

I agree with Alice that this patch can accepted on its own.

> ---
>  rust/kernel/types.rs | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/rust/kernel/types.rs b/rust/kernel/types.rs
> index 1e5380b16ed5..185d3493857e 100644
> --- a/rust/kernel/types.rs
> +++ b/rust/kernel/types.rs
> @@ -237,6 +237,11 @@ pub const fn uninit() -> Self {
>          Self(MaybeUninit::uninit())
>      }
>  
> +    /// Creates a zeroed value.
> +    pub fn zeroed() -> Self {
> +        Self(MaybeUninit::zeroed())
> +    }
> +
>      /// Creates a pin-initializer from the given initializer closure.
>      ///
>      /// The returned initializer calls the given closure with the pointer to the inner `T` of this
>