Re: [PATCH v6 1/6] rust: acpi: add `acpi::DeviceId` abstraction

[Danilo Krummrich <dakr@kernel.org>]

On Fri, Jun 13, 2025 at 02:38:42PM +0100, 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(id: &'static CStr) -> Self {
> +        assert!(id.len() <= Self::ACPI_ID_LEN, "ID exceeds 16 bytes");

Please use build_assert!() for this check.

> +        let src = id.as_bytes_with_nul();
> +        // 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 < src.len() {
> +            acpi.id[i] = src[i];
> +            i += 1;
> +        }
> +
> +        Self(acpi)
> +    }
> +}