linux-kernel - Re: [PATCH v2 3/6] rust: device: Support testing devices for equality

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Message-Id: <DG5GWC5MR1ZC.3VFVRL0G0NMUW@kernel.org>
Date: Tue, 03 Feb 2026 17:29:16 +0100
From: "Danilo Krummrich" <dakr@...nel.org>
To: "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Cc: "Matthew Maurer" <mmaurer@...gle.com>, "Bjorn Andersson"
 <andersson@...nel.org>, "Konrad Dybcio" <konradybcio@...nel.org>, "Satya
 Durga Srinivasu Prabhala" <satyap@...cinc.com>, "Miguel Ojeda"
 <ojeda@...nel.org>, "Boqun Feng" <boqun.feng@...il.com>, "Gary Guo"
 <gary@...yguo.net>, Björn Roy Baron
 <bjorn3_gh@...tonmail.com>, "Benno Lossin" <lossin@...nel.org>, "Andreas
 Hindborg" <a.hindborg@...nel.org>, "Alice Ryhl" <aliceryhl@...gle.com>,
 "Trevor Gross" <tmgross@...ch.edu>, "Daniel Almeida"
 <daniel.almeida@...labora.com>, "Rafael J. Wysocki" <rafael@...nel.org>,
 "David Airlie" <airlied@...il.com>, "Simona Vetter" <simona@...ll.ch>,
 "Michal Wilczynski" <m.wilczynski@...sung.com>, "Dave Ertman"
 <david.m.ertman@...el.com>, "Ira Weiny" <ira.weiny@...el.com>, "Leon
 Romanovsky" <leon@...nel.org>, "Trilok Soni" <tsoni@...cinc.com>,
 <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
 <rust-for-linux@...r.kernel.org>, <driver-core@...ts.linux.dev>,
 <dri-devel@...ts.freedesktop.org>, <linux-pwm@...r.kernel.org>
Subject: Re: [PATCH v2 3/6] rust: device: Support testing devices for
 equality

On Tue Feb 3, 2026 at 5:17 PM CET, Greg Kroah-Hartman wrote:
> And I don't see what patch in this series uses this, am I missing it?

	impl Smem {
	    pub(crate) fn access<'a>(&'a self, dev: &'a Device<Bound>) -> Option<&'a Mmio> {
	        if *dev != *self.dev {
	            return None;
	        }

	        // SAFETY: By our invariant, this was a subrange of what was returned by smem_aux_get, for
	        // self.dev, and by our above check, that auxdev is still available.
	        Some(unsafe { Mmio::from_raw(&self.raw) })
	    }
	}

It's used to ensure that the Smem provided by the auxiliary parent can only be
accessed as long as the auxiliary parent device is bound.