linux-kernel - Re: [PATCH bpf-next v2 3/6] net: remove duplicate reuseport

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Message-ID: <CAN+4W8jTTQqz2Fgzz4AndzpEo=Xteqisv88HqQu=j_VPcu3OVQ@mail.gmail.com>
Date:   Wed, 14 Jun 2023 16:42:45 +0100
From:   Lorenz Bauer <lmb@...valent.com>
To:     Simon Horman <simon.horman@...igine.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        David Ahern <dsahern@...nel.org>,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Joe Stringer <joe@...d.net.nz>,
        Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>,
        Kuniyuki Iwashima <kuniyu@...zon.com>,
        Hemanth Malla <hemanthmalla@...il.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf-next v2 3/6] net: remove duplicate reuseport_lookup functions

On Tue, Jun 13, 2023 at 4:33 PM Simon Horman <simon.horman@...igine.com> wrote:
> >
> > +INDIRECT_CALLABLE_DECLARE(u32 udp_ehashfn(const struct net *,
> > +                                       const __be32, const __u16,
> > +                                       const __be32, const __be16));
> > +
>
> Hi Lorenz,
>
> Would this be better placed in a header file?
> GCC complains that in udp.c this function is neither static nor
> has a prototype.

Hi Simon,

The problem is that I don't want to pull in udp.h in
inet_hashtables.c, but that is the natural place to define that
function. I was hoping the macro magic would solve the problem, but oh
well. How do you make gcc complain, and what is the full error
message?

Thanks
Lorenz