linux-kernel - Re: [PATCH] rust: init: remove impl Zeroable for Infallible

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Message-ID: <CAH5fLgjMkWxqTxZKt_w+V6X1qfUzosTbwMxDVXUmw_qTdzYP_A@mail.gmail.com>
Date: Thu, 14 Mar 2024 10:14:57 +0100
From: Alice Ryhl <aliceryhl@...gle.com>
To: Benno Lossin <benno.lossin@...ton.me>, Laine Taffin Altman <alexanderaltman@...com>
Cc: Miguel Ojeda <ojeda@...nel.org>, 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>, Martin Rodriguez Reboredo <yakoyoku@...il.com>, stable@...r.kernel.org, 
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rust: init: remove impl Zeroable for Infallible

On Thu, Mar 14, 2024 at 12:09 AM Benno Lossin <benno.lossin@...ton.me> wrote:
>
> From: Laine Taffin Altman <alexanderaltman@...com>
>
> It is not enough for a type to be a ZST to guarantee that zeroed memory
> is a valid value for it; it must also be inhabited. Creating a value of
> an uninhabited type, ZST or no, is immediate UB.
> Thus remove the implementation of `Zeroable` for `Infallible`, since
> that type is not inhabited.
>
> Cc: stable@...r.kernel.org
> Fixes: 38cde0bd7b67 ("rust: init: add `Zeroable` trait and `init::zeroed` function")
> Closes: https://github.com/Rust-for-Linux/pinned-init/pull/13
> Signed-off-by: Laine Taffin Altman <alexanderaltman@...com>
> Signed-off-by: Benno Lossin <benno.lossin@...ton.me>

Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>