linux-kernel - Re: [PATCH -next v7 1/2] rust: clist: Add support to interface with C linked lists

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Message-ID: <7ed85eca-2a5e-4e8f-8356-e7fbbf7d3a8f@nvidia.com>
Date: Fri, 6 Feb 2026 15:51:08 -0500
From: Joel Fernandes <joelagnelf@...dia.com>
To: Daniel Almeida <daniel.almeida@...labora.com>
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Subject: Re: [PATCH -next v7 1/2] rust: clist: Add support to interface with C
 linked lists

Hi Daniel,
Hope you do not mind me replying piecemeal as I can reply more quickly. Thank
you for all the comments.

On 2/6/2026 12:49 PM, Daniel Almeida wrote:
>> +use crate::{
>> +    bindings,
>> +    types::Opaque, //
>> +};
>> +
>> +use pin_init::PinInit;
>> +
>> +/// Wraps a `list_head` object for use in intrusive linked lists.
>> +///
>> +/// # Invariants
>> +///
>> +/// - [`CListHead`] represents an allocated and valid `list_head` structure.
>> +/// - Once a [`CListHead`] is created in Rust, it will not be modified by non-Rust code.
>> +/// - All `list_head` for individual items are not modified for the lifetime of [`CListHead`].
>
> Can you expand on the two points above?

This is basically saying that a C `list_head` that is wrapped by a `CListHead`
is read-only for the lifetime of `ClistHead`. modifying the pointers anymore.
That is the invariant.

Or did I miss something?

-- 
Joel Fernandes