Re: [PATCH] rust: Disallow BTF generation with Rust + LTO

Neal Gompa
2025-01-09T14:10:53Z

On Thu, Jan 9, 2025 at 8:17 AM Miguel Ojeda
<miguel.ojeda.sandonis@gmail.com> wrote:
>
> On Thu, Jan 9, 2025 at 12:35 AM Matthew Maurer <mmaurer@google.com> wrote:
> >
> > The kernel cannot currently self-parse BTF containing Rust debug
> > information. pahole uses the language of the CU to determine whether to
> > filter out debug information when generating the BTF. When LTO is
> > enabled, Rust code can cross CU boundaries, resulting in Rust debug
> > information in CUs labeled as C. This results in a system which cannot
> > parse its own BTF.
>
> Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
>
> as well as BPF/BTF, plus others that may be using or were involved
> with the right-hand side of the condition.
>

Do we have cases where something is a mix of C and Rust? I thought all
our Linux Rust code was self-contained?

--
真実はいつも一つ！/ Always, there's only one truth!