netdev - Re: [PATCH v2 bpf-next 00/14] bpf: Support calling kernel function

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Message-ID: <CAM_iQpUTFs_60vkS6LTRr5VBt8yTHiSgaHoKrtt4GGDe4tCcew@mail.gmail.com>
Date:   Sun, 28 Mar 2021 13:13:35 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Martin KaFai Lau <kafai@...com>, bpf <bpf@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        kernel-team <kernel-team@...com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH v2 bpf-next 00/14] bpf: Support calling kernel function

On Sat, Mar 27, 2021 at 3:54 PM Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
>
> On Sat, Mar 27, 2021 at 3:08 PM Cong Wang <xiyou.wangcong@...il.com> wrote:
> >   BTFIDS  vmlinux
> > FAILED unresolved symbol cubictcp_state
> > make: *** [Makefile:1199: vmlinux] Error 255
> >
> > I suspect it is related to the kernel config or linker version.
> >
> > # grep TCP_CONG .config
> > CONFIG_TCP_CONG_ADVANCED=y
> > CONFIG_TCP_CONG_BIC=m
> > CONFIG_TCP_CONG_CUBIC=y
> ..
> >
> > # pahole --version
> > v1.17
>
> That is the most likely reason.
> In lib/Kconfig.debug
> we have pahole >= 1.19 requirement for BTF in modules.
> Though your config has CUBIC=y I suspect something odd goes on.
> Could you please try the latest pahole 1.20 ?

Sure, I will give it a try tomorrow, I am not in control of the CI I ran.

Thanks.