linux-kernel - Re: linux-next: build failure in the final build

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Message-ID: <aXFyakDy3VSRw1NW@um790>
Date: Wed, 21 Jan 2026 16:42:18 -0800
From: Deborah Brouwer <deborah.brouwer@...labora.com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Mark Brown <broonie@...nel.org>, Danilo Krummrich <dakr@...nel.org>,
	Beata Michalska <beata.michalska@....com>,
	Carsten Haitzler <carsten.haitzler@...s.arm.com>,
	Rob Herring <robh@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure in the final build

On Wed, Jan 21, 2026 at 07:14:38PM +0000, Alice Ryhl wrote:
> On Wed, Jan 21, 2026 at 05:14:15PM +0000, Mark Brown wrote:
> > Hi all,
> > 
> > After the final merge today's linux-next build (arm64 allyesconfig)
> > failed like this, the same issue will be present in mainline:
> > 
> > error: field `device` is never read
> >   --> /tmp/next/build/drivers/gpu/drm/tyr/driver.rs:37:5
> >    |
> > 36 | pub(crate) struct TyrDriver {
> >    |                   --------- field in this struct
> > 37 |     device: ARef<TyrDevice>,
> >    |     ^^^^^^
> >    |
> >    = note: `-D dead-code` implied by `-D warnings`
> >    = help: to override `-D warnings` add `#[allow(dead_code)]`
> > 
> > error: fields `mali` and `sram` are never read
> >    --> /tmp/next/build/drivers/gpu/drm/tyr/driver.rs:196:5
> >     |
> > 195 | struct Regulators {
> >     |        ---------- fields in this struct
> > 196 |     mali: Regulator<regulator::Enabled>,
> >     |     ^^^^
> > 197 |     sram: Regulator<regulator::Enabled>,
> >     |     ^^^^
> > 
> > error: aborting due to 2 previous errors
> > 
> > Caused by commit
> > 
> >    cf4fd52e32360 (rust: drm: Introduce the Tyr driver for Arm Mali GPUs)
> > 
> > I am continuing to mark the driver as BROKEN.
> 
> Hrm I saw you had this last time too. I'm not sure how you're triggering
> it - I haven't run into it myself and I do enable warnings. But I'll try
> to repro and fix it.

Although I hadn't seen this error before I was able to reproduce it
today on linux-next/master so I don't know if it's too late, but here is
a quick fix.

https://lore.kernel.org/rust-for-linux/20260122003746.405370-1-deborah.brouwer@collabora.com/

> 
> Note that for this kind of thing you can add `#![allow(warnings)]` to
> the top of a file to silence warnings.
> 
> Alice