linux-kernel - Re: drivers/comedi/drivers/tests/../ni_stc.h:1140:35: warning: 'range_ni_E_ao

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Date:   Mon, 6 Nov 2023 10:48:57 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Yujie Liu <yujie.liu@...el.com>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: drivers/comedi/drivers/tests/../ni_stc.h:1140:35: warning:
 'range_ni_E_ao_ext' defined but not used

On Mon, Nov 06, 2023 at 05:31:26PM +0800, Yujie Liu wrote:
> Hi Greg,
> 
> On Mon, Nov 06, 2023 at 10:00:14AM +0100, Greg Kroah-Hartman wrote:
> > On Mon, Nov 06, 2023 at 04:49:17PM +0800, kernel test robot wrote:
> > > Hi Greg,
> > > 
> > > kernel test robot noticed the following build warnings:
> > > 
> > > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > > head:   1c41041124bd14dd6610da256a3da4e5b74ce6b1
> > > commit: 8ffdff6a8cfbdc174a3a390b6f825a277b5bb895 staging: comedi: move out of staging directory
> > > date:   2 years, 7 months ago
> > 
> > Have you tested a newer kernel?  Testing a 2 1/2 year old commit feels
> > odd to me, was this intentional?
> 
> We did test new kernels with W=1, and the issue was captured by the
> bot, then bisected to this 2 years 7 months ago commit that was likely
> to introduce this issue initially.

This commit is a "move files around" commit, so it obviously was not the
original problem commit here :)

> We have no intention of directly
> testing a very old commit, and we're sorry that the date info may
> cause some misunderstanding.
> 
> This can be reproduced by allyesconfig build on v6.6 with W=1:
> 
> $ git checkout v6.6
> HEAD is now at ffc253263a13 Linux 6.6
> 
> $ make ARCH=x86_64 allyesconfig
> 
> $ make W=1 ARCH=x86_64 drivers/comedi/drivers/tests/ni_routes_test.o
> ...
>   CC      drivers/comedi/drivers/tests/ni_routes_test.o
> In file included from drivers/comedi/drivers/tests/ni_routes_test.c:22:
> drivers/comedi/drivers/tests/../ni_stc.h:1140:35: error: ‘range_ni_E_ao_ext’ defined but not used [-Werror=unused-const-variable=]
>  1140 | static const struct comedi_lrange range_ni_E_ao_ext;
>       |                                   ^~~~~~~~~~~~~~~~~
> cc1: all warnings being treated as errors

This is odd in that a static constant is being defined in a .h file, so
anything that happens to include it, like this test, will then need to
use it in order to silence this warning.  I don't think that's going to
happen any time soon, so it's good that we don't really care aobut W=1
just yet :)

thanks,

greg k-h