Re: [PATCH v6 6/6] s390: Enable Rust support

[Jan Polensky]

On Tue, Jun 16, 2026 at 10:45:10AM +0200, Miguel Ojeda wrote:
> On Tue, Jun 16, 2026 at 9:39 AM Alice Ryhl <aliceryhl@xxxxxxxxxx> wrote:
> >
> > Since fixing this requires a change in rustc to recognize the backchain
> > target feature, has this work been started? I think that for stuff like
> > this, we should make to at least start working on fixing the warning so
> > that we don't emit a warning forever.
>
> That is the expectation, yeah.
>
> Jan et al.: for powerpc I have been accumulating the links etc. in
> https://github.com/Rust-for-Linux/linux/issues/105 -- do you have
> similar links to the ongoing work for s390 so that I can fill the
> equivalent https://github.com/Rust-for-Linux/linux/issues/106?
>
> Thanks!
>
> Cheers,
> Miguel

Hi Miguel,

thanks for raising this. We discussed the backchain warning today with
the s390 compiler folks, and the plan is to move the backchain target
feature into stable so we can support the kernel use case without
carrying warnings indefinitely.

There is nothing public to point to just yet (no issue or tracking link
yet), but the work is now owned on the IBM/s390 side. Eduard Stefens will
take care of driving this forward from there.

So while we do not have a link to add today, the stabilization work is
expected to happen.

Thanks,
Jan