linux-kernel - Re: [PATCH 3/3] rust: add WMI abstractions

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Message-ID: <CAKBF=psOiiakGigJj0Kee3Z5rym41eksSZTgzsO3H1gzUP6DjA@mail.gmail.com>
Date: Thu, 8 Jan 2026 22:48:12 +0200
From: Kari Argillander <kari.argillander@...il.com>
To: Gladyshev Ilya <foxido@...ido.dev>
Cc: "foxido @ foxido . dev-cc= Rafael J. Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>, Miguel Ojeda <ojeda@...nel.org>, 
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	Benno Lossin <lossin@...nel.org>, Andreas Hindborg <a.hindborg@...nel.org>, 
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, 
	Danilo Krummrich <dakr@...nel.org>, Tamir Duberstein <tamird@...il.com>, Armin Wolf <W_Armin@....de>, 
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org, 
	rust-for-linux@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH 3/3] rust: add WMI abstractions

On Wed, 7 Jan 2026 at 22:56, Gladyshev Ilya <foxido@...ido.dev> wrote:
<snip>

> +impl DeviceId {
> +    /// Constructs new DeviceId from GUID string.
> +    pub const fn new(guid: &[u8; bindings::UUID_STRING_LEN as usize]) -> Self {
> +        // SAFETY: FFI type is valid to be zero-initialized.
> +        let mut inner: bindings::wmi_device_id = unsafe { MaybeUninit::zeroed().assume_init() };
> +
> +        build_assert!(inner.guid_string.len() == bindings::UUID_STRING_LEN as usize + 1);
> +
> +        // SAFETY: It's safe to copy UUID_STRING_LEN, because we validated lengths.
> +        // Also we leave last byte zeroed, so guid_string is valid C string.
> +        unsafe {
> +            ::core::ptr::copy_nonoverlapping(
> +                guid.as_ptr(),
> +                &raw mut inner.guid_string[0],
> +                bindings::UUID_STRING_LEN as usize,
> +            );
> +        }

Just use while here so no unsafe is needed at all. Then probably patch
1/3 is not needed.

> +
> +        Self(inner)
> +    }
> +}