Re: [PATCH bpf-next v4 1/3] bpf: Relax tracing prog recursive attach rules

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> On Thu, Nov 30, 2023 at 12:19:31PM -0800, Song Liu wrote:
> > All in all I've decided that more elaborated approach is slightly
> > better. But if everyone in the community agrees that less
> > "defensiveness" is not an issue and verifier could be simply made less
> > restrictive, I'm fine with that. What do you think?
>
> I think the follower_cnt check is not necessary, and may cause confusions.
> For tracing programs, we are very specific on "which function(s) are we
> tracing". So I don't think circular attachment can be a real issue. Do we
> have potential use cases that make the circular attach possible?

At the moment no, nothing like that in sight. Ok, you've convinced me --
plus since nobody has yet actively mentioned that potential cycle
prevention is nice to have, I can drop follower_cnt and the
corresponding check in the verifier.




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