From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: kernel test robot <lkp@intel.com>,
Nick Desaulniers <nick.desaulniers@gmail.com>
Cc: Sakari Ailus <sakari.ailus@linux.intel.com>,
clang-built-linux <clang-built-linux@googlegroups.com>,
kbuild-all@lists.01.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Thomas Zimmermann <tzimmermann@suse.de>,
Petr Mladek <pmladek@suse.com>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Subject: Re: drivers/media/v4l2-core/v4l2-ioctl.c:303:28: warning: taking address of packed member 'pixelformat' of class or structure 'v4l2_pix_format_mplane' may result in an unaligned pointer value
Date: Wed, 14 Jul 2021 22:45:26 +0300 [thread overview]
Message-ID: <CAHp75Vfu1rhUV+SOq2ikFWd2G6x9j3BT6OLPhPcf8VZE5Umeqw@mail.gmail.com> (raw)
In-Reply-To: <202107150148.RpWnKapX-lkp@intel.com>
+Cc: Nick. Nick, any recommendations on how to fix this in the best
possible way?
On Wed, Jul 14, 2021 at 8:58 PM kernel test robot <lkp@intel.com> wrote:
>
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head: 8096acd7442e613fad0354fc8dfdb2003cceea0b
> commit: e927e1e0f0dd3e353d5556503a71484008692c82 v4l: ioctl: Use %p4cc printk modifier to print FourCC codes
> date: 5 months ago
> config: mips-randconfig-r004-20210714 (attached as .config)
> compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8d69635ed9ecf36fd0ca85906bfde17949671cbe)
> reproduce (this is a W=1 build):
> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> chmod +x ~/bin/make.cross
> # install mips cross compiling tool for clang build
> # apt-get install binutils-mips-linux-gnu
> # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e927e1e0f0dd3e353d5556503a71484008692c82
> git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> git fetch --no-tags linus master
> git checkout e927e1e0f0dd3e353d5556503a71484008692c82
> # save the attached .config to linux build tree
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@intel.com>
>
> All warnings (new ones prefixed by >>):
>
> >> drivers/media/v4l2-core/v4l2-ioctl.c:303:28: warning: taking address of packed member 'pixelformat' of class or structure 'v4l2_pix_format_mplane' may result in an unaligned pointer value [-Waddress-of-packed-member]
> mp->width, mp->height, &mp->pixelformat,
This seems unsolvable without copying a value.
> >> drivers/media/v4l2-core/v4l2-ioctl.c:347:37: warning: taking address of packed member 'pixelformat' of class or structure 'v4l2_sdr_format' may result in an unaligned pointer value [-Waddress-of-packed-member]
Why is it packed in the first place? Is it used on unaligned addresses
in other structures? But even so, why should it matter?
> >> drivers/media/v4l2-core/v4l2-ioctl.c:353:5: warning: taking address of packed member 'dataformat' of class or structure 'v4l2_meta_format' may result in an unaligned pointer value [-Waddress-of-packed-member]
> &meta->dataformat, meta->buffersize);
Ditto.
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2021-07-14 20:03 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-14 17:55 drivers/media/v4l2-core/v4l2-ioctl.c:303:28: warning: taking address of packed member 'pixelformat' of class or structure 'v4l2_pix_format_mplane' may result in an unaligned pointer value kernel test robot
2021-07-14 19:45 ` Andy Shevchenko [this message]
2021-07-16 11:41 ` Sakari Ailus
2021-07-16 12:12 ` Andy Shevchenko
2021-08-19 8:10 ` Sakari Ailus
2021-08-26 13:22 ` Petr Mladek
2021-11-04 22:21 kernel test robot
2021-11-05 10:21 ` Andy Shevchenko
2022-01-08 10:33 kernel test robot
2022-01-09 14:26 ` Andy Shevchenko
2022-01-10 19:44 ` Nick Desaulniers
2022-01-10 20:49 ` Andy Shevchenko
2022-01-10 21:22 ` Nick Desaulniers
2022-01-17 3:40 kernel test robot
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