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

Miguel Ojeda
2025-01-09T13:17:48Z

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.

Thanks!

Cheers,
Miguel