linux-kernel - Re: [PATCH] staging: atomisp: avoid false-positive maybe-uninitialized warning

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Date:   Tue, 28 Mar 2017 22:40:35 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     kbuild test robot <lkp@...el.com>
Cc:     kbuild-all@...org, Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Cox <alan@...ux.intel.com>, devel@...verdev.osuosl.org,
        Varsha Rao <rvarsha016@...il.com>,
        sayli karnik <karniksayli1995@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-media@...r.kernel.org
Subject: Re: [PATCH] staging: atomisp: avoid false-positive
 maybe-uninitialized warning

On Tue, Mar 28, 2017 at 10:10 PM, kbuild test robot <lkp@...el.com> wrote:
> Hi Arnd,
>
> [auto build test ERROR on staging/staging-testing]
> [also build test ERROR on next-20170328]
> [cannot apply to linuxtv-media/master v4.11-rc4]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>
> url:    https://github.com/0day-ci/linux/commits/Arnd-Bergmann/staging-atomisp-avoid-false-positive-maybe-uninitialized-warning/20170329-023715
> config: i386-allmodconfig (attached as .config)
> compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
> reproduce:
>         # save the attached .config to linux build tree
>         make ARCH=i386
>
> All errors (new ones prefixed by >>):
>
>    drivers/staging/media/atomisp/i2c/mt9m114.c: In function 'mt9m114_get_fmt':
>>> drivers/staging/media/atomisp/i2c/mt9m114.c:818:25: error: unused variable 'dev' [-Werror=unused-variable]
>      struct mt9m114_device *dev = to_mt9m114_sensor(sd);
>                             ^~~
>    drivers/staging/media/atomisp/i2c/mt9m114.c: In function 'mt9m114_s_exposure_selection':
>    drivers/staging/media/atomisp/i2c/mt9m114.c:1179:25: error: unused variable 'dev' [-Werror=unused-variable]
>      struct mt9m114_device *dev = to_mt9m114_sensor(sd);
>                             ^~~
>    cc1: all warnings being treated as errors
>

Very odd, I should obviouly have run into these when verifying my patch.
I guess

I'm preparing an v2 patch and will send that once I've built some more
randconfigs on top of recreating the bug and fix.

     Arnd