linux-kernel - Re: linux-next: build warning after merge of the i2c tree

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Date:   Wed, 18 Aug 2021 17:04:18 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Jie Deng <jie.deng@...el.com>
Cc:     Wolfram Sang <wsa@...-dreams.de>,
        Conghui Chen <conghui.chen@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build warning after merge of the i2c tree

Hi Jie,

On Wed, 18 Aug 2021 14:54:12 +0800 Jie Deng <jie.deng@...el.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 = vdev->dev.parent;
> >        |                 ^~~~
> >
> > Introduced by commit
> >
> >    8fb12751ac78 ("i2c: virtio: add a virtio i2c frontend driver")  
> 
> Why we have this warning ? In commit 8fb12751ac78, the variable 'pdev' was used in line 237.
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git/commit/?h=i2c/for-next&id=8fb12751ac78d0a4ba3c604496ffc8dcd1bd6c31
> 

When CONFIG_ACPI is not set, ACPI_COMPANION{,_SET} do not use their arguments.

-- 
Cheers,
Stephen Rothwell

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