linux-kernel - Re: [kbuild-all] Re: fs/ntfs3/fsntfs.c:2248:41: warning: taking address of packed member 'de' of class or structure 'NTFS_DE_SII' may result in an unaligned pointer value

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Message-ID: <90b97ffb-1feb-a83f-44e7-61e77b77ad6e@intel.com>
Date:   Tue, 25 Jan 2022 16:08:40 +0800
From:   "Chen, Rong A" <rong.a.chen@...el.com>
To:     Nathan Chancellor <nathan@...nel.org>,
        kernel test robot <lkp@...el.com>
Cc:     Konstantin Komarov <almaz.alexandrovich@...agon-software.com>,
        llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: Re: [kbuild-all] Re: fs/ntfs3/fsntfs.c:2248:41: warning: taking
 address of packed member 'de' of class or structure 'NTFS_DE_SII' may result
 in an unaligned pointer value



On 1/25/2022 1:41 AM, Nathan Chancellor wrote:
> On Mon, Jan 24, 2022 at 11:21:59PM +0800, kernel test robot wrote:
>> Hi Konstantin,
>>
>> FYI, the error/warning still remains.
>>
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   dd81e1c7d5fb126e5fbc5c9e334d7b3ec29a16a0
>> commit: 6e5be40d32fb1907285277c02e74493ed43d77fe fs/ntfs3: Add NTFS3 in fs/Kconfig and fs/Makefile
>> date:   5 months ago
>> config: mips-buildonly-randconfig-r001-20220122 (https://download.01.org/0day-ci/archive/20220124/202201242326.uQ3OazUi-lkp@intel.com/config)
>> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 7b3d30728816403d1fd73cc5082e9fb761262bce)
>> 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=6e5be40d32fb1907285277c02e74493ed43d77fe
>>          git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>          git fetch --no-tags linus master
>>          git checkout 6e5be40d32fb1907285277c02e74493ed43d77fe
>>          # save the config file to linux build tree
>>          mkdir build_dir
>>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash fs/ntfs3/
>>
>> If you fix the issue, kindly add following tag as appropriate
>> Reported-by: kernel test robot <lkp@...el.com>
>>
>> All warnings (new ones prefixed by >>):
>>
>>     fs/ntfs3/fsntfs.c:1874:9: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
>>             size_t cnt, off;
>>                    ^
>>>> fs/ntfs3/fsntfs.c:2248:41: warning: taking address of packed member 'de' of class or structure 'NTFS_DE_SII' may result in an unaligned pointer value [-Waddress-of-packed-member]
>>             err = indx_insert_entry(indx_sii, ni, &sii_e.de, NULL, NULL);
>>                                                    ^~~~~~~~
>>     2 warnings generated.
> 
> This warning has the same root cause as
> https://lore.kernel.org/r/YenXz+RznXBuJMSR@dev-arch.archlinux-ax161/.
> 
> Intel folks, would it be possible to limit instances of
> -Waddress-of-packed-member with mips randconfigs to our mailing list for
> the reason I note in the link above?
> 
> Cheers,
> Nathan

Hi Nathan,

Thanks for the advice, will do it.

Best Regards,
Rong Chen