linux-kernel - Re: [PATCH] rust: types: Make Opaque::get const

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Date: Tue, 02 Apr 2024 12:49:58 +0000
From: Benno Lossin <benno.lossin@...ton.me>
To: Boqun Feng <boqun.feng@...il.com>, rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, Wedson Almeida Filho <wedsonaf@...il.com>, Gary Guo <gary@...yguo.net>, Björn Roy Baron <bjorn3_gh@...tonmail.com>, Andreas Hindborg <a.hindborg@...sung.com>, Alice Ryhl <aliceryhl@...gle.com>, Martin Rodriguez Reboredo <yakoyoku@...il.com>, Obei Sideg <linux@...i.io>
Subject: Re: [PATCH] rust: types: Make Opaque::get const

On 01.04.24 23:45, Boqun Feng wrote:
> To support a potential usage:
> 
>      static foo: Opaque<Foo> = ..; // Or defined in an extern block.
> 
>      ...
> 
>      fn bar() {
>          let ptr = foo.get();
>      }
> 
> `Opaque::get` need to be `const`, otherwise compiler will complain
> because calls on statics are limited to const functions.
> 
> Also `Opaque::get` should be naturally `const` since it's a composition
> of two `const` functions: `UnsafeCell::get` and `ptr::cast`.
> 
> Signed-off-by: Boqun Feng <boqun.feng@...il.com>
> ---
>   rust/kernel/types.rs | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Benno Lossin <benno.lossin@...ton.me>

-- 
Cheers,
Benno