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

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On Tue, Mar 30, 2021 at 2:43 AM Lorenz Bauer <lmb@xxxxxxxxxxxxxx> wrote:
>
> On Thu, 25 Mar 2021 at 01:52, Martin KaFai Lau <kafai@xxxxxx> wrote:
> >
> > This series adds support to allow bpf program calling kernel function.
>
> I think there are more build problems with this. Has anyone hit this before?
>
> $ CLANG=clang-12 O=../kbuild/vm ./tools/testing/selftests/bpf/vmtest.sh -j 7
>
>   GEN-SKEL [test_progs-no_alu32] bind6_prog.skel.h
> libbpf: elf: skipping unrecognized data section(5) .rodata.str1.1
>   GEN-SKEL [test_progs-no_alu32] bind_perm.skel.h
> libbpf: elf: skipping unrecognized data section(5) .rodata.str1.1
>   GEN-SKEL [test_progs-no_alu32] bpf_cubic.skel.h
>   GEN-SKEL [test_progs-no_alu32] bpf_dctcp.skel.h
>   GEN-SKEL [test_progs-no_alu32] bpf_flow.skel.h
> libbpf: failed to find BTF for extern 'tcp_cong_avoid_ai' [27] section: -2
> Error: failed to open BPF object file: No such file or directory

The doc update is on its way:
https://patchwork.kernel.org/project/netdevbpf/patch/20210330054156.2933804-1-kafai@xxxxxx/



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