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Date:   Mon, 6 Nov 2023 17:31:26 +0800
From:   Yujie Liu <yujie.liu@intel.com>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
CC:     <oe-kbuild-all@lists.linux.dev>, <linux-kernel@vger.kernel.org>
Subject: Re: drivers/comedi/drivers/tests/../ni_stc.h:1140:35: warning:
 'range_ni_E_ao_ext' defined but not used
Message-ID: <ZUiybtcMJGI5ZCF5@yujie-X299>
References: <202311060001.aEuf1q9y-lkp@intel.com>
 <2023110641-profusely-factor-b3c5@gregkh>
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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. 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
make[6]: *** [scripts/Makefile.build:243: drivers/comedi/drivers/tests/ni_routes_test.o] Error 1
make[5]: *** [scripts/Makefile.build:480: drivers/comedi/drivers/tests] Error 2
make[4]: *** [scripts/Makefile.build:480: drivers/comedi/drivers] Error 2
make[3]: *** [scripts/Makefile.build:480: drivers/comedi] Error 2
make[2]: *** [scripts/Makefile.build:480: drivers] Error 2


Best Regards,
Yujie