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 = 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