linux-kernel - Re: [PATCH net-next] xdp: Make __mem_id

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Message-ID: <CAPhsuW7e8KLooD_ASwWE_dbJwNTcs5sqR66LTWxR-cH3SBzSJw@mail.gmail.com>
Date:   Tue, 25 Jun 2019 15:23:24 -0700
From:   Song Liu <liu.song.a23@...il.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     YueHaibing <yuehaibing@...wei.com>,
        "David S . Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        John Fastabend <john.fastabend@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>, xdp-newbies@...r.kernel.org,
        bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH net-next] xdp: Make __mem_id_disconnect static

On Tue, Jun 25, 2019 at 4:52 AM Jesper Dangaard Brouer
<brouer@...hat.com> wrote:
>
> On Tue, 25 Jun 2019 10:31:37 +0800
> YueHaibing <yuehaibing@...wei.com> wrote:
>
> > Fix sparse warning:
> >
> > net/core/xdp.c:88:6: warning:
> >  symbol '__mem_id_disconnect' was not declared. Should it be static?
>
> I didn't declare it static as I didn't want it to get inlined.  As
> during development I was using kprobes to inspect this function.  In
> the end I added a tracepoint in this function as kprobes was not enough
> to capture the state needed.
>
> So, I guess we can declare it static.
>
> Acked-by: Jesper Dangaard Brouer <brouer@...hat.com>

I think the rule is, non-static function must be declared in a header.

Acked-by: Song Liu <songliubraving@...com>

>
> > Reported-by: Hulk Robot <hulkci@...wei.com>
> > Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> > ---
> >  net/core/xdp.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/net/core/xdp.c b/net/core/xdp.c
> > index b29d7b5..829377c 100644
> > --- a/net/core/xdp.c
> > +++ b/net/core/xdp.c
> > @@ -85,7 +85,7 @@ static void __xdp_mem_allocator_rcu_free(struct rcu_head *rcu)
> >       kfree(xa);
> >  }
> >
> > -bool __mem_id_disconnect(int id, bool force)
> > +static bool __mem_id_disconnect(int id, bool force)
> >  {
> >       struct xdp_mem_allocator *xa;
> >       bool safe_to_remove = true;
>
>
> --
> Best regards,
>   Jesper Dangaard Brouer
>   MSc.CS, Principal Kernel Engineer at Red Hat
>   LinkedIn: http://www.linkedin.com/in/brouer