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Date:   Wed, 18 Aug 2021 17:04:18 +1000
From:   Stephen Rothwell <sfr@canb.auug.org.au>
To:     Jie Deng <jie.deng@intel.com>
Cc:     Wolfram Sang <wsa@the-dreams.de>,
        Conghui Chen <conghui.chen@intel.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Next Mailing List <linux-next@vger.kernel.org>
Subject: Re: linux-next: build warning after merge of the i2c tree
Message-ID: <20210818170418.5e03390b@canb.auug.org.au>
In-Reply-To: <1d80c5e6-5d5e-1714-78d8-8d2b9c6f8389@intel.com>
References: <20210818162959.4dfe60a0@canb.auug.org.au>
        <1d80c5e6-5d5e-1714-78d8-8d2b9c6f8389@intel.com>
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Hi Jie,

On Wed, 18 Aug 2021 14:54:12 +0800 Jie Deng <jie.deng@intel.com> wrote:
>
> On 2021/8/18 14:29, Stephen Rothwell wrote:
> > Hi all,
> >
> > After merging the i2c tree, today's linux-next build (powerpc
> > allyesconfig) produced this warning:
> >
> > drivers/i2c/busses/i2c-virtio.c: In function 'virtio_i2c_probe':
> > drivers/i2c/busses/i2c-virtio.c:208:17: warning: unused variable 'pdev'=
 [-Wunused-variable]
> >    208 |  struct device *pdev =3D vdev->dev.parent;
> >        |                 ^~~~
> >
> > Introduced by commit
> >
> >    8fb12751ac78 ("i2c: virtio: add a virtio i2c frontend driver") =20
>=20
> Why we have this warning ? In commit 8fb12751ac78, the variable 'pdev' wa=
s used in line 237.
>=20
> https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git/commit/?h=
=3Di2c/for-next&id=3D8fb12751ac78d0a4ba3c604496ffc8dcd1bd6c31
>=20

When CONFIG_ACPI is not set, ACPI_COMPANION{,_SET} do not use their argumen=
ts.

--=20
Cheers,
Stephen Rothwell

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