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Date: Mon, 13 Jul 2026 22:55:14 +0200
Message-Id: <DJXQR57LG8IY.2FG6YY420VFYG@kernel.org>
Subject: Re: [PATCH] rust: device: make lifetime on `Core` and
 `CoreInternal` invariant
Cc: "Alice Ryhl" <aliceryhl@google.com>, "Alexandre Courbot"
 <acourbot@nvidia.com>, "David Airlie" <airlied@gmail.com>, "Simona Vetter"
 <simona@ffwll.ch>, "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
 "Rafael J. Wysocki" <rafael@kernel.org>, "Miguel Ojeda" <ojeda@kernel.org>,
 "Boqun Feng" <boqun@kernel.org>, =?utf-8?q?Bj=C3=B6rn_Roy_Baron?=
 <bjorn3_gh@protonmail.com>, "Benno Lossin" <lossin@kernel.org>, "Andreas
 Hindborg" <a.hindborg@kernel.org>, "Trevor Gross" <tmgross@umich.edu>,
 "Daniel Almeida" <daniel.almeida@collabora.com>, "Tamir Duberstein"
 <tamird@kernel.org>, =?utf-8?q?Onur_=C3=96zkan?= <work@onurozkan.dev>,
 "Eliot Courtney" <ecourtney@nvidia.com>, <nova-gpu@lists.linux.dev>,
 <dri-devel@lists.freedesktop.org>, <linux-kernel@vger.kernel.org>,
 <driver-core@lists.linux.dev>, <rust-for-linux@vger.kernel.org>
To: "Gary Guo" <gary@garyguo.net>
From: "Danilo Krummrich" <dakr@kernel.org>
References: <20260713201455.640151-1-gary@kernel.org>
 <DJXQ32PBP5Z8.2ADOOIWKYOLP5@garyguo.net>
In-Reply-To: <DJXQ32PBP5Z8.2ADOOIWKYOLP5@garyguo.net>

On Mon Jul 13, 2026 at 10:23 PM CEST, Gary Guo wrote:
> Actually, a more proper fix is to make `Device` invariant over their
> context. It would require touching all `Device`, though.
>
> Danilo, let me know if you'd prefer that approach instead.

The bigger change is not a concern, but requiring every bus device implemen=
tor
to consider this is a bit of a concern. If we can enforce it in the driver =
core
code I'd prefer that.