Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
MIME-Version: 1.0
References: <31468.1548648675@turing-police.cc.vt.edu> <CAPhsuW54z8ao4KOKG9ZjdXus6LTBH2qwAi8LgPFZ_qb_ObKsRg@mail.gmail.com>
 <9865.1548718516@turing-police.cc.vt.edu>
In-Reply-To: <9865.1548718516@turing-police.cc.vt.edu>
From:   Song Liu <liu.song.a23@gmail.com>
Date:   Mon, 28 Jan 2019 19:12:49 -0800
Message-ID: <CAPhsuW7F0yoOdgF335uET-_j+KkNohRCmG7sseisBK+bpaQy4g@mail.gmail.com>
Subject: Re: [PATCH] bpf/core.c - silence warning messages
To:     Valdis Kletnieks <valdis.kletnieks@vt.edu>
Cc:     Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Networking <netdev@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Mon, Jan 28, 2019 at 3:35 PM <valdis.kletnieks@vt.edu> wrote:
>
> On Mon, 28 Jan 2019 09:18:45 -0800, Song Liu said:
> > On Sun, Jan 27, 2019 at 8:43 PM <valdis.kletnieks@vt.edu> wrote:
>
> > > The attached patch silences the warnings, because we *know* we're overwriting
> > > the default initializer. That leaves bpf/core.c with only 6 other warnings,
> > > which become more visible in comparison.
> >
> > My concern is that this will also mute the warning for other parts of
> > bpf/core.c.
>
> I checked and there weren't any warnings for other parts of the file.  Also, this message
> doesn't even happen unless you build with W=1, which apparently happens so rarely
> that nobody else has submitted a patch.
>
> Is there a high likelihood that another overwrite of an initializer is going to
> be included in the source?
>
> > Maybe we should move bpf_opcode_in_insntable() to a separate file, and mute
> > warning for that file?
>
> Seems to be overkill - the intent of this patch was mostly to make the *other*
> warnings issued with W=1 more noticable.

Yeah, I also felt this might be overkill while asking initially.

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