linux-kernel - Re: drivers/crypto/qat/qat_c62xvf/adf_c62xvf_hw_data.c:102:28: warning: taking address of packed member 'csr_ops' of class or structure 'adf_hw_device_data' may result in an unaligned pointer value

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Date:   Wed, 1 Sep 2021 14:18:17 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     kernel test robot <lkp@...el.com>
Cc:     Giovanni Cabiddu <giovanni.cabiddu@...el.com>,
        llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Fiona Trahe <fiona.trahe@...el.com>,
        Wojciech Ziemba <wojciech.ziemba@...el.com>
Subject: Re: drivers/crypto/qat/qat_c62xvf/adf_c62xvf_hw_data.c:102:28:
 warning: taking address of packed member 'csr_ops' of class or structure
 'adf_hw_device_data' may result in an unaligned pointer value

On Wed, Sep 01, 2021 at 12:19:08AM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   b91db6a0b52e019b6bdabea3f1dbe36d85c7e52c
> commit: f9c697c4bfc6002d92e8015b65fe2a79acadb416 crypto: qat - split transport CSR access logic
> date:   10 months ago
> config: i386-randconfig-r012-20210831 (attached as .config)
> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 4b1fde8a2b681dad2ce0c082a5d6422caa06b0bc)
> 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
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f9c697c4bfc6002d92e8015b65fe2a79acadb416
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout f9c697c4bfc6002d92e8015b65fe2a79acadb416
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=i386 
> 
> 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 >>):
> 
>    clang-14: warning: optimization flag '-falign-jumps=0' is not supported [-Wignored-optimization-argument]
>    In file included from drivers/crypto/qat/qat_c62xvf/adf_c62xvf_hw_data.c:3:
>    In file included from drivers/crypto/qat/qat_c62xvf/../qat_common/adf_accel_devices.h:5:
>    In file included from include/linux/interrupt.h:11:
>    In file included from include/linux/hardirq.h:5:
>    In file included from include/linux/context_tracking_state.h:5:
>    In file included from include/linux/percpu.h:6:
>    In file included from include/linux/preempt.h:78:
>    In file included from arch/x86/include/asm/preempt.h:7:
>    In file included from include/linux/thread_info.h:38:
>    arch/x86/include/asm/thread_info.h:183:13: warning: calling '__builtin_frame_address' with a nonzero argument is unsafe [-Wframe-address]
>            oldframe = __builtin_frame_address(1);
>                       ^~~~~~~~~~~~~~~~~~~~~~~~~~
>    arch/x86/include/asm/thread_info.h:185:11: warning: calling '__builtin_frame_address' with a nonzero argument is unsafe [-Wframe-address]
>                    frame = __builtin_frame_address(2);

Funny, but it's not related to the reported issue.

>                            ^~~~~~~~~~~~~~~~~~~~~~~~~~
> >> drivers/crypto/qat/qat_c62xvf/adf_c62xvf_hw_data.c:102:28: warning: taking address of packed member 'csr_ops' of class or structure 'adf_hw_device_data' may result in an unaligned pointer value [-Waddress-of-packed-member]
>            adf_gen2_init_hw_csr_ops(&hw_data->csr_ops);
>                                      ^~~~~~~~~~~~~~~~
>    3 warnings generated.


Why on Earth the struct adf_hw_device_data, that contains a lot of pointers,
marked as __packed?! That __packed has to be dropped.

-- 
With Best Regards,
Andy Shevchenko