linux-kernel - 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 00:19:08 +0800
From:   kernel test robot <lkp@...el.com>
To:     Giovanni Cabiddu <giovanni.cabiddu@...el.com>
Cc:     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>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: 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

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);
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~
>> 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.


vim +102 drivers/crypto/qat/qat_c62xvf/adf_c62xvf_hw_data.c

    68	
    69	void adf_init_hw_data_c62xiov(struct adf_hw_device_data *hw_data)
    70	{
    71		hw_data->dev_class = &c62xiov_class;
    72		hw_data->num_banks = ADF_C62XIOV_ETR_MAX_BANKS;
    73		hw_data->num_rings_per_bank = ADF_ETR_MAX_RINGS_PER_BANK;
    74		hw_data->num_accel = ADF_C62XIOV_MAX_ACCELERATORS;
    75		hw_data->num_logical_accel = 1;
    76		hw_data->num_engines = ADF_C62XIOV_MAX_ACCELENGINES;
    77		hw_data->tx_rx_gap = ADF_C62XIOV_RX_RINGS_OFFSET;
    78		hw_data->tx_rings_mask = ADF_C62XIOV_TX_RINGS_MASK;
    79		hw_data->alloc_irq = adf_vf_isr_resource_alloc;
    80		hw_data->free_irq = adf_vf_isr_resource_free;
    81		hw_data->enable_error_correction = adf_vf_void_noop;
    82		hw_data->init_admin_comms = adf_vf_int_noop;
    83		hw_data->exit_admin_comms = adf_vf_void_noop;
    84		hw_data->send_admin_init = adf_vf2pf_init;
    85		hw_data->init_arb = adf_vf_int_noop;
    86		hw_data->exit_arb = adf_vf_void_noop;
    87		hw_data->disable_iov = adf_vf2pf_shutdown;
    88		hw_data->get_accel_mask = get_accel_mask;
    89		hw_data->get_ae_mask = get_ae_mask;
    90		hw_data->get_num_accels = get_num_accels;
    91		hw_data->get_num_aes = get_num_aes;
    92		hw_data->get_etr_bar_id = get_etr_bar_id;
    93		hw_data->get_misc_bar_id = get_misc_bar_id;
    94		hw_data->get_pf2vf_offset = get_pf2vf_offset;
    95		hw_data->get_vintmsk_offset = get_vintmsk_offset;
    96		hw_data->get_sku = get_sku;
    97		hw_data->enable_ints = adf_vf_void_noop;
    98		hw_data->enable_vf2pf_comms = adf_enable_vf2pf_comms;
    99		hw_data->min_iov_compat_ver = ADF_PFVF_COMPATIBILITY_VERSION;
   100		hw_data->dev_class->instances++;
   101		adf_devmgr_update_class_index(hw_data);
 > 102		adf_gen2_init_hw_csr_ops(&hw_data->csr_ops);
   103	}
   104	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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