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Date:   Tue, 15 Sep 2020 11:02:07 -0700
From:   Alexei Starovoitov <>
To:     Maciej Fijalkowski <>
Cc:     Alexei Starovoitov <>,
        Daniel Borkmann <>,
        bpf <>,
        Network Development <>,
        Björn Töpel <>,
        "Karlsson, Magnus" <>
Subject: Re: [PATCH v7 bpf-next 7/7] selftests: bpf: add dummy prog for
 bpf2bpf with tailcall

On Tue, Sep 15, 2020 at 10:52 AM Maciej Fijalkowski
<> wrote:
> > > +   /* this means we are at the end of the call chain; if throughout this
> >
> > In my mind 'end of the call chain' means 'leaf function',
> > so the comment reads a bit misleading to me.
> > Here we're at the end of subprog.
> > It's not necessarily the leaf function.
> Hmm you're right i'll try to rephrase that.
> What about just:
> "if tail call got detected across bpf2bpf calls then mark each of the
> currently present subprog frames as tail call reachable subprogs"

sounds good to me.

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