[PATCH 2/3] ARM: Select ARCH_USES_CFI_GENERIC_LLVM_PASS

[Sami Tolvanen]

On Tue, Oct 28, 2025 at 10:52 AM Nathan Chancellor <nathan at kernel.org> wrote:
>
> On Mon, Oct 27, 2025 at 11:56:21PM +0100, Linus Walleij wrote:
> > On Mon, Oct 27, 2025 at 4:54 PM Sami Tolvanen <samitolvanen at google.com> wrote:
> > > Instead of working around issues with the generic pass, would it make
> > > more sense to just disable arm32 CFI with older Clang versions
> > > entirely? Linus, any thoughts?
> >
> > We have people using this with the default compilers that come with
> > Debiand and Fedora. I would say as soon as the latest release of
> > the major distributions supports this, we can drop support for older
> > compilers.
>
> Okay, I think that is reasonable enough. This is not a very large
> workaround and I do not expect these type of workarounds to be necessary
> frequently so I think it is worth keeping this working if people are
> actually using it. That means we could mandate the backend version of
> kCFI for ARM with Debian Forky in 2027.

Yeah, it's a bit unfortunate, but I agree that we shouldn't break
existing users until newer Clang is actually available in distros.

Sami