netdev - Re: [PATCH bpf-next] libbpf: make LIBBPF_OPTS macro strictly a variable declaration

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Date:   Mon, 21 Oct 2019 16:51:37 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Jakub Sitnicki <jakub@...udflare.com>
Cc:     Andrii Nakryiko <andriin@...com>, bpf <bpf@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH bpf-next] libbpf: make LIBBPF_OPTS macro strictly a
 variable declaration

On Mon, Oct 21, 2019 at 12:01 PM Jakub Sitnicki <jakub@...udflare.com> wrote:
>
> On Mon, Oct 21, 2019 at 06:57 PM CEST, Andrii Nakryiko wrote:
> > LIBBPF_OPTS is implemented as a mix of field declaration and memset
> > + assignment. This makes it neither variable declaration nor purely
> > statements, which is a problem, because you can't mix it with either
> > other variable declarations nor other function statements, because C90
> > compiler mode emits warning on mixing all that together.
> >
> > This patch changes LIBBPF_OPTS into a strictly declaration of variable
> > and solves this problem, as can be seen in case of bpftool, which
> > previously would emit compiler warning, if done this way (LIBBPF_OPTS as
> > part of function variables declaration block).
> >
> > Signed-off-by: Andrii Nakryiko <andriin@...com>
> > ---
>
> Just a suggestion - macro helpers like this usually have DECLARE in
> their name. At least in the kernel. For instance DECLARE_COMPLETION.

Yes, it makes sense. This will cause some extra code churn, but it's
not too late. Will rename in v2 and fix current usages.

>
> -Jakub