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Date: Wed, 12 Aug 2026 20:47:37 +0200
Message-Id: <DKN6TRRJ2OY3.2U6M6TQDNSM27@kernel.org>
To: "Gary Guo" <gary@garyguo.net>
From: "Danilo Krummrich" <dakr@kernel.org>
Subject: Re: [PATCH v2 1/5] rust: pci: convert IrqVectorRegistration to a
 lifetime-managed owning type
Cc: <bhelgaas@google.com>, <kwilczynski@kernel.org>, <aliceryhl@google.com>,
 <daniel.almeida@collabora.com>, <ojeda@kernel.org>, <boqun@kernel.org>,
 <bjorn3_gh@protonmail.com>, <lossin@kernel.org>, <a.hindborg@kernel.org>,
 <tmgross@umich.edu>, <tamird@kernel.org>, <acourbot@nvidia.com>,
 <work@onurozkan.dev>, <jhubbard@nvidia.com>, <ttabi@nvidia.com>,
 <apopple@nvidia.com>, <ecourtney@nvidia.com>, <shashanks@nvidia.com>,
 <zhiw@nvidia.com>, <driver-core@lists.linux.dev>,
 <linux-pci@vger.kernel.org>, <rust-for-linux@vger.kernel.org>,
 <linux-kernel@vger.kernel.org>
References: <20260811233952.3000968-1-dakr@kernel.org>
 <20260811233952.3000968-2-dakr@kernel.org>
 <DKN3U000UGRL.2MOXT25O11UE0@garyguo.net>
 <DKN5C359PZP3.2BPH5HLM9H0HY@kernel.org>
 <DKN6203R3WD1.1NLN19VVBZJO9@garyguo.net>
In-Reply-To: <DKN6203R3WD1.1NLN19VVBZJO9@garyguo.net>

On Wed Aug 12, 2026 at 8:11 PM CEST, Gary Guo wrote:
> Well, I'd expect some drivers want to do `.vector(v).expect()` rather tha=
n just
> propagating the error if `v` is a constant that is less than `min_vecs`..

This is nothing we want drivers to do; this API is only ever called from a
fallible context anyway and propagating costs nothing, but on the other han=
d, if
the driver gets it wrong, we'd BUG() the whole kernel for no value.