Re: FYI: CI regression on big-endian arch (s390) after recent pahole changes

[Tony Ambardar <tony.ambardar@gmail.com>]

On Thu, Aug 29, 2024 at 05:05:20PM -0700, Eduard Zingerman wrote:
> Hi Arnaldo, Alan,
> 
> After recent pahole changes [1] BPF CI fails for s390 [2].
> Song Liu identified that there is a mismatch between endianness of BTF
> in .BTF and .BTF.base sections.
> 
> I think that the correct fix should be on libbpf side,
> where btf__distill_base() should inherit endianness from source BTF.
> If there are any plans for new pahole release,
> could you please postpone it until current issue is resolved?
> (I should have a fix for this thing by tomorrow).

Hi Eduard,

Thanks for looking at this. I ran into the CI failure while using s390x
to test a series adding libbpf bi-endian support. Since I'm deep into
endianness issues right now, I thought to try the fix you suggested just
to make some progress but noticed the CI failure has disappeared.[0]

Did something get fixed already? I can't seem to find the change.

Many thanks,
Tony

[0] https://github.com/kernel-patches/bpf/pull/7520
> 
> Best regards,
> Eduard
> 
> [1] c7b1f6a29ba1 ("btf_encoder: Add "distilled_base" BTF feature to split BTF generation")
> [2] https://github.com/kernel-patches/bpf/actions/runs/10622763027/job/29447973415
>