netdev - Re: [PATCH bpf-next] bpf: return -EOPNOTSUPP when attaching to non-kernel BTF

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Date:   Mon, 07 Dec 2020 15:07:28 +0100
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Andrii Nakryiko <andrii@...nel.org>
Cc:     bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>,
        Alexei Starovoitov <ast@...nel.org>
Subject: Re: [PATCH bpf-next] bpf: return -EOPNOTSUPP when attaching to
 non-kernel BTF

Alexei Starovoitov <alexei.starovoitov@...il.com> writes:

> On Fri, Dec 4, 2020 at 7:11 PM Andrii Nakryiko <andrii@...nel.org> wrote:
>> +                               return -EOPNOTSUPP;
>
> $ cd kernel/bpf
> $ git grep ENOTSUPP|wc -l
> 46
> $ git grep EOPNOTSUPP|wc -l
> 11

But also

$ cd kernel/include/uapi
$ git grep ENOTSUPP | wc -l
0
$ git grep EOPNOTSUPP | wc -l
8

(i.e., ENOTSUPP is not defined in userspace headers at all)

-Toke