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

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Date:   Thu, 15 Jun 2023 09:21:43 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Lorenz Bauer <lmb@...valent.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 Wed, Jun 14, 2023 at 04:42:45PM +0100, Lorenz Bauer wrote:
> 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?

Hi Lorenz,

sorry for the bother.

With gcc 12.3.0 [1] on x86_64 I see:

$ make allmodconfig
$ make W=1 net/ipv4/udp.o
net/ipv4/udp.c:410:5: error: no previous prototype for 'udp_ehashfn' [-Werror=missing-prototypes]
  410 | u32 udp_ehashfn(const struct net *net, const __be32 laddr, const __u16 lport,
      |     ^~~~~~~~~~~

[1] https://mirrors.edge.kernel.org/pub/tools/crosstool/