Backporting 6.2 kernel to Jammy causes config issues at build time

[Dimitri John Ledkov]

On Mon, 24 Apr 2023 at 21:59, Andrea Righi <andrea.righi at canonical.com> wrote:
>
> On Mon, Apr 24, 2023 at 01:36:33PM -0600, Tim Gardner wrote:
> > Hi Andrea,
> >
> > I've been working on backporting the Lunar Azure kernel to Jammy [1]. For
> > some reason the RUST annotations that I've specified are ignored when I
> > upload sources to CBD or Launchpad. See attached log file.
> >
> > I can otherwise run 'cranky updateconfigs -c' with no error.
> >
> > Since you architected this new method for managing configs, I wondered if
> > you had any thoughts ?
>
> So, ...
>
> > ***
> > *** Rust compiler 'rustc-1.62' is too new. This may or may not work.
> > ***   Your version:     1.62.1
> > ***   Expected version: 1.62.0
> > ***
> > Rust is available!
>
> ^ This tells you this build environment (jammy build chroot in cbd) has
> all the components that are required to enable Rust (basically toolchain
> requirements are satisfied).
>
> So, this means that you *can* enable Rust if you want.
>
> > check-config: loading annotations from /build/jammy/debian.azure-6.2/config/annotations
> > check-config: FAIL: (y != -): CONFIG_RUST_IS_AVAILABLE policy<{'amd64': '-', 'arm64': '-', 'armhf': '-', 'ppc64el': '-', 'riscv64': '-', 's390x': '-'}>)
>
> ^ This tells you that the expected value for CONFIG_RUST_IS_AVAILABLE
> was '-', but instead it's 'y'.
>
> I read this as: your local build chroot doesn't have all the components
> required by Rust, while cbd has them (need to refresh your local chroot
> maybe? or maybe we have not installed rustc-1.62, bindgen-0.56, etc. in
> our jammy build chroot?).
>
> Moreover, I think we don't want Rust enabled in jammy, so CONFIG_RUST
> should be not set, but CONFIG_RUST_IS_AVAILABLE should be 'y', because
> theoretically we already have all the required components in Jammy.

rust things are available in builder-extras PPA, and in
jammy-proposed. We still have rust-bindgen-0.56 in jammy-proposed, as
it has not been verified yet. Trying to complete the build of a rusty
kernel in jammy using that bindgen to see if it can be set to
verified, and thus migrate.


-- 
okurrr,

Dimitri