Subject: Re: linux-next: build failure in final build

From: Alice Ryhl <[email-masked]>
Date: Tue, 20 Jan 2026 08:36:48 +0000

On Mon, Jan 19, 2026 at 11:49:10PM +0100, Danilo Krummrich wrote:
> (Cc: Boris)
> 
> On Mon Jan 19, 2026 at 11:30 PM CET, Mark Brown wrote:
> > Hi all,
> >
> > After merging all trees, today's final linux-next build (arm64
> > allyesconfig) failed like this:
> >
> > error[E0560]: struct `drm_panthor_gpu_info` has no field named `pad0`
> >   --> /tmp/next/build/drivers/gpu/drm/tyr/gpu.rs:75:13
> >    |
> > 75 |             pad0: 0,
> >    |             ^^^^ `drm_panthor_gpu_info` does not have this field
> >    |
> >    = note: available fields are: `selected_coherency`
> >
> > Caused by commit
> >
> >    8304c44631c37 (drm/tyr: use generated bindings for GpuInfo)
> 
> I had a quick look and the problem is that another tree (drm-misc-next) changed
> the corresponding uAPI struct in commit ea78ec982653 ("drm/panthor: Expose the
> selected coherency protocol to the UMD") without also changing the Tyr driver.
> 
> This diff in Tyr should fix the problem:
> 
> diff --git a/drivers/gpu/drm/tyr/gpu.rs b/drivers/gpu/drm/tyr/gpu.rs
> index 3072562e36e5..0c85f03b8a7d 100644
> --- a/drivers/gpu/drm/tyr/gpu.rs
> +++ b/drivers/gpu/drm/tyr/gpu.rs
> @@ -72,7 +72,7 @@ pub(crate) fn new(dev: &Device<Bound>, iomem: &Devres<IoMem>) -> Result<Self> {
>              // TODO: Add texture_features_{1,2,3}.
>              texture_features: [texture_features, 0, 0, 0],
>              as_present,
> -            pad0: 0,
> +            selected_coherency: 0, // Some variant of `enum drm_panthor_gpu_coherency`.
>              shader_present,
>              l2_present,
>              tiler_present,

Yeah, if that diff can be made in the merge commit, it should solve the
issue.

If it's easier, we could merge a commit into drm-misc-next that renames
pad0 to selected_coherency. That would trigger a merge conflict on the
relevant lines of code.

Alice