netdev - Re: [PATCH bpf-next] libbpf: fix false unused variable warning

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Date:   Wed, 29 Apr 2020 19:13:52 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Yuehaibing <yuehaibing@...wei.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: fix false unused variable warning

On Wed, Apr 29, 2020 at 6:52 PM Yuehaibing <yuehaibing@...wei.com> wrote:
>
> On 2020/4/30 9:25, Andrii Nakryiko wrote:
> > Some versions of GCC falsely detect that vi might not be initialized. That's
> > not true, but let's silence it with NULL initialization.
> >
>
> Title should be fixed 'unused' --> 'uninitialized' ?

Yep, my bad, will send v2 with correction.

>
> > Signed-off-by: Andrii Nakryiko <andriin@...com>
> > ---
> >  tools/lib/bpf/libbpf.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> > index d86ff8214b96..977add1b73e2 100644
> > --- a/tools/lib/bpf/libbpf.c
> > +++ b/tools/lib/bpf/libbpf.c
> > @@ -5003,8 +5003,8 @@ static int bpf_object__collect_map_relos(struct bpf_object *obj,
> >                                        GElf_Shdr *shdr, Elf_Data *data)
> >  {
> >       int i, j, nrels, new_sz, ptr_sz = sizeof(void *);
> > +     const struct btf_var_secinfo *vi = NULL;
> >       const struct btf_type *sec, *var, *def;
> > -     const struct btf_var_secinfo *vi;
> >       const struct btf_member *member;
> >       struct bpf_map *map, *targ_map;
> >       const char *name, *mname;
> >
>