linux-kernel - Re: [PATCH -next v8 1/3] rust: clist: Add support to interface with C linked lists

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Message-ID: <20260211210952.GA3632639@joelbox2>
Date: Wed, 11 Feb 2026 16:09:52 -0500
From: Joel Fernandes <joelagnelf@...dia.com>
To: Danilo Krummrich <dakr@...nel.org>
Cc: linux-kernel@...r.kernel.org,
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Subject: Re: [PATCH -next v8 1/3] rust: clist: Add support to interface with
 C linked lists

On Tue, Feb 10, 2026 at 11:07:37AM +0100, Danilo Krummrich wrote:
> On Mon Feb 9, 2026 at 10:42 PM CET, Joel Fernandes wrote:
> >  rust/kernel/clist.rs   | 320 +++++++++++++++++++++++++++++++++++++++++
> 
> I think we should move this under rust/kernel/ffi/ to make it obvious that this
> is FFI infrastructure.
> 
> > diff --git a/rust/kernel/clist.rs b/rust/kernel/clist.rs
> > new file mode 100644
> > index 000000000000..8aa72b5d54be
> > --- /dev/null
> > +++ b/rust/kernel/clist.rs
> > @@ -0,0 +1,320 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +
> > +//! A C doubly circular intrusive linked list interface for rust code.
> 
> Here and in the struct documentation, I'd suggest to clearly point out the
> use-cases, i.e. that this infrastructure is for FFI use-cases only and should
> not be used otherwise in drivers, etc

I am curious why we would not want to have drivers be able to use CList. I
thought that was the point of making it pub at the module/item level as well.
I think it is possible a rust driver may have a reference to a CList in the
future.

But I will update the current usecase above, as you suggested, good point.

thanks,

 - Joel