linux-kernel - Re: [PATCH v8 4/9] rust: acpi: add `acpi::DeviceId` abstraction

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <c5d750fd-ffcf-4d07-bfff-ebe206faa41a@kernel.org>
Date: Thu, 26 Jun 2025 17:25:29 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: Igor Korotin <igor.korotin.linux@...il.com>
Cc: "Rafael J . Wysocki" <rafael@...nel.org>,
 Alex Gaynor <alex.gaynor@...il.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Miguel Ojeda <ojeda@...nel.org>, Rob Herring <robh@...nel.org>,
 Saravana Kannan <saravanak@...gle.com>, Alex Hung <alex.hung@....com>,
 Andrew Morton <akpm@...ux-foundation.org>, Jakub Kicinski <kuba@...nel.org>,
 Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
 Remo Senekowitsch <remo@...nzli.dev>, Tamir Duberstein <tamird@...il.com>,
 Viresh Kumar <viresh.kumar@...aro.org>,
 Wedson Almeida Filho <wedsonaf@...il.com>,
 Xiangfei Ding <dingxiangfei2009@...il.com>, devicetree@...r.kernel.org,
 linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
 rust-for-linux@...r.kernel.org, Björn Roy Baron
 <bjorn3_gh@...tonmail.com>, Alice Ryhl <aliceryhl@...gle.com>,
 Andreas Hindborg <a.hindborg@...nel.org>, Benno Lossin <lossin@...nel.org>,
 Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
 Len Brown <lenb@...nel.org>, Trevor Gross <tmgross@...ch.edu>
Subject: Re: [PATCH v8 4/9] rust: acpi: add `acpi::DeviceId` abstraction

On 6/20/25 5:24 PM, Igor Korotin wrote:
> +impl DeviceId {
> +    const ACPI_ID_LEN: usize = 16;
> +
> +    /// Create a new device id from an ACPI 'id' string.
> +    pub const fn new<const N: usize>(id: &[u8; N]) -> Self {

Didn't notice before, but why was this silently changed from &CStr to &[u8; N]
from v6 to v7?

> +        build_assert!(N <= Self::ACPI_ID_LEN, "ID exceeds 16 bytes");
> +        // Replace with `bindings::acpi_device_id::default()` once stabilized for `const`.
> +        // SAFETY: FFI type is valid to be zero-initialized.
> +        let mut acpi: bindings::acpi_device_id = unsafe { core::mem::zeroed() };
> +        let mut i = 0;
> +        while i < N {
> +            acpi.id[i] = id[i];
> +            i += 1;
> +        }
> +
> +        Self(acpi)
> +    }
> +}