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Date: Thu, 30 Apr 2026 15:36:11 +0200
Message-Id: <DI6J2O3THBON.30TCZ9GDGHJO1@kernel.org>
Subject: Re: [PATCH 00/24] rust: device: Higher-Ranked Lifetime Types for
 device drivers
Cc: <gregkh@linuxfoundation.org>, <rafael@kernel.org>,
 <acourbot@nvidia.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>,
 <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>
To: "Alice Ryhl" <aliceryhl@google.com>
From: "Danilo Krummrich" <dakr@kernel.org>
References: <20260427221155.2144848-1-dakr@kernel.org>
 <afMdfs0segrRBx34@google.com>
In-Reply-To: <afMdfs0segrRBx34@google.com>

On Thu Apr 30, 2026 at 11:14 AM CEST, Alice Ryhl wrote:
> Super cool to see this!
>
> On Tue, Apr 28, 2026 at 12:10:58AM +0200, Danilo Krummrich wrote:
>> Before:
>>=20
>> 	struct MyDriver {
>> 	    pdev: ARef<pci::Device>,
>> 	    bar: Devres<pci::Bar<BAR_SIZE>>,
>> 	}
>>=20
>> 	let io =3D self.bar.access(dev)?;
>> 	io.read32(OFFSET);
>>=20
>> After:
>>=20
>> 	struct MyDriver<'a> {
>> 	    pdev: &'a pci::Device,
>> 	    bar: pci::Bar<'a, BAR_SIZE>,
>> 	}
>>=20
>> 	self.bar.read32(OFFSET);
>
> I think we should establish a convention for how to name the lifetime
> early. Using just the generic name 'a is probably not ideal.
>
> How about using 'dev for lifetimes that correspond to the lifetime of
> the device being bound?

I'd rather not go for 'dev, as it could be confused with the lifetime of th=
e
struct device itself, which is reference counted and independent from the d=
evice
/ driver binding lifecycle.

People already confuse this all the time, so I'd rather go for 'bound, whic=
h is
more precise, but could be a bit long on the other hand.