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References: <20230224-rust-new_uninit-v1-1-c951443d9e26@asahilina.net>
In-Reply-To: <20230224-rust-new_uninit-v1-1-c951443d9e26@asahilina.net>
From:   Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Date:   Mon, 10 Apr 2023 04:54:02 +0200
Message-ID: <CANiq72ma7p9q8Usos6=Opv+YwzOXKgLXj6EEBUsfY2OY7KniGg@mail.gmail.com>
Subject: Re: [PATCH] rust: Enable the new_uninit feature for kernel and driver crates
To:     Asahi Lina <lina@asahilina.net>
Cc:     Miguel Ojeda <ojeda@kernel.org>,
        Alex Gaynor <alex.gaynor@gmail.com>,
        Wedson Almeida Filho <wedsonaf@gmail.com>,
        Boqun Feng <boqun.feng@gmail.com>, Gary Guo <gary@garyguo.net>,
        =?UTF-8?Q?Bj=C3=B6rn_Roy_Baron?= <bjorn3_gh@protonmail.com>,
        Masahiro Yamada <masahiroy@kernel.org>,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Nicolas Schier <nicolas@fjasle.eu>,
        rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-kbuild@vger.kernel.org, asahi@lists.linux.dev
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On Fri, Feb 24, 2023 at 9:10=E2=80=AFAM Asahi Lina <lina@asahilina.net> wro=
te:
>
> The unstable new_uninit feature enables various library APIs to create
> uninitialized containers, such as `Box::assume_init()`. This is
> necessary to build abstractions that directly initialize memory at the
> target location, instead of doing copies through the stack.
>
> Will be used by the DRM scheduler abstraction in the kernel crate, and
> by field-wise initialization (e.g. using `place!()` or a future
> replacement macro which may itself live in `kernel`) in driver crates.
>
> See [1] [2] [3] for background information.
>
> [1] https://github.com/Rust-for-Linux/linux/issues/879
> [2] https://github.com/Rust-for-Linux/linux/issues/2
> [3] https://github.com/rust-lang/rust/issues/63291

Applied to `rust-next` (reworded to use `Link` tags). Thanks!

Cheers,
Miguel