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Date: Tue, 28 Apr 2026 15:14:15 +0200
Message-Id: <DI4TCSCZ215E.16ZCXW7RSXBF@kernel.org>
Subject: Re: [PATCH 03/24] rust: devres: add ForLt support to Devres
Cc: <driver-core@lists.linux.dev>, <linux-kernel@vger.kernel.org>,
 <nova-gpu@lists.linux.dev>, <dri-devel@lists.freedesktop.org>,
 <linux-pm@vger.kernel.org>, <linux-pwm@vger.kernel.org>,
 <linux-pci@vger.kernel.org>, <rust-for-linux@vger.kernel.org>, "Danilo
 Krummrich" <dakr@kernel.org>
To: <gregkh@linuxfoundation.org>, <rafael@kernel.org>,
 <acourbot@nvidia.com>, <aliceryhl@google.com>, <david.m.ertman@intel.com>,
 <ira.weiny@intel.com>, <leon@kernel.org>, <viresh.kumar@linaro.org>,
 <m.wilczynski@samsung.com>, <ukleinek@kernel.org>, <bhelgaas@google.com>,
 <kwilczynski@kernel.org>, <abdiel.janulgue@gmail.com>,
 <robin.murphy@arm.com>, <markus.probst@posteo.de>, <ojeda@kernel.org>,
 <boqun@kernel.org>, <gary@garyguo.net>, <bjorn3_gh@protonmail.com>,
 <lossin@kernel.org>, <a.hindborg@kernel.org>, <tmgross@umich.edu>
From: "Danilo Krummrich" <dakr@kernel.org>
References: <20260427221155.2144848-1-dakr@kernel.org>
 <20260427221155.2144848-4-dakr@kernel.org>
In-Reply-To: <20260427221155.2144848-4-dakr@kernel.org>

On Tue Apr 28, 2026 at 12:11 AM CEST, Danilo Krummrich wrote:
> Use ForLt::cast_ref() in Devres access methods, enabling lifetime
> shortening for types that are covariant over their lifetime parameter.
>
> This is a no-op for 'static types, but prepares Devres for use with
> lifetime-parameterized types such as pci::Bar<'_, SIZE>.
>
> Add DevresGuard as a wrapper around RevocableGuard that applies
> ForLt::cast_ref() on deref().
>
> Signed-off-by: Danilo Krummrich <dakr@kernel.org>

Please disregard this patch, it does nothing for this patch series.

It sneaked in from a subsequent series I work on which makes device resourc=
e
types, such as pci::Bar, ForLt!() types themselves.

One difficulty is that ForLt!(Bar<'_, SIZE>) fails when SIZE is a generic c=
onst
parameter, as it would require generic_const_exprs.