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Date:   Mon, 25 Jul 2022 11:53:55 +0800
From:   kernel test robot <lkp@intel.com>
To:     Oleksij Rempel <o.rempel@pengutronix.de>
Cc:     llvm@lists.linux.dev, kbuild-all@lists.01.org,
        linux-kernel@vger.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@huawei.com>,
        Andy Shevchenko <andy.shevchenko@gmail.com>
Subject: drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of
 packed member 'data' of class or structure 'tsc2046_adc_atom' may result in
 an unaligned pointer value
Message-ID: <202207251140.M7YAqoLC-lkp@intel.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Precedence: bulk

Hi Oleksij,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   e0dccc3b76fb35bb257b4118367a883073d7390e
commit: 9374e8f5a38defe90bc65b2decf317c1c62d91dd iio: adc: add ADC driver for the TI TSC2046 controller
date:   1 year, 2 months ago
config: arm-randconfig-r025-20220724 (https://download.01.org/0day-ci/archive/20220725/202207251140.M7YAqoLC-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 9e88cbcc403bdf82f29259ad60ff60a8fc4434a1)
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 arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9374e8f5a38defe90bc65b2decf317c1c62d91dd
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 9374e8f5a38defe90bc65b2decf317c1c62d91dd
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/iio/adc/ drivers/staging/ fs/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value [-Waddress-of-packed-member]
           return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
                                                                       ^~~~~~~~~
   include/linux/bitfield.h:108:27: note: expanded from macro 'FIELD_GET'
                   __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: ");       \
                                           ^~~~
   include/linux/bitfield.h:52:38: note: expanded from macro '__BF_FIELD_CHECK'
                   BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull,         \
                                                      ^~~~
   include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
   #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                                            ^~~~
   note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   include/linux/compiler_types.h:308:9: note: expanded from macro '__compiletime_assert'
                   if (!(condition))                                       \
                         ^~~~~~~~~
   include/linux/compiler.h:56:47: note: expanded from macro 'if'
   #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
                                                 ^~~~
   include/linux/compiler.h:58:52: note: expanded from macro '__trace_if_var'
   #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
                                                      ^~~~
>> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value [-Waddress-of-packed-member]
           return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
                                                                       ^~~~~~~~~
   include/linux/bitfield.h:108:27: note: expanded from macro 'FIELD_GET'
                   __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: ");       \
                                           ^~~~
   include/linux/bitfield.h:52:38: note: expanded from macro '__BF_FIELD_CHECK'
                   BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull,         \
                                                      ^~~~
   include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
   #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                                            ^~~~
   note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   include/linux/compiler_types.h:308:9: note: expanded from macro '__compiletime_assert'
                   if (!(condition))                                       \
                         ^~~~~~~~~
   include/linux/compiler.h:56:47: note: expanded from macro 'if'
   #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
                                                 ^~~~
   include/linux/compiler.h:58:61: note: expanded from macro '__trace_if_var'
   #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
                                                               ^~~~
>> drivers/iio/adc/ti-tsc2046.c:242:62: warning: taking address of packed member 'data' of class or structure 'tsc2046_adc_atom' may result in an unaligned pointer value [-Waddress-of-packed-member]
           return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
                                                                       ^~~~~~~~~
   include/linux/bitfield.h:108:27: note: expanded from macro 'FIELD_GET'
                   __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: ");       \
                                           ^~~~
   include/linux/bitfield.h:52:38: note: expanded from macro '__BF_FIELD_CHECK'
                   BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull,         \
                                                      ^~~~
   include/linux/build_bug.h:39:58: note: expanded from macro 'BUILD_BUG_ON_MSG'
   #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                                            ^~~~
   note: (skipping 3 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   include/linux/compiler.h:56:47: note: expanded from macro 'if'
   #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
                                                 ^~~~
   include/linux/compiler.h:58:86: note: expanded from macro '__trace_if_var'
   #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
                                                                                        ^~~~
   include/linux/compiler.h:69:3: note: expanded from macro '__trace_if_value'
           (cond) ?                                        \
            ^~~~
   3 warnings generated.


vim +242 drivers/iio/adc/ti-tsc2046.c

   239	
   240	static u16 tsc2046_adc_get_value(struct tsc2046_adc_atom *buf)
   241	{
 > 242		return FIELD_GET(TI_TSC2046_DATA_12BIT, get_unaligned_be16(&buf->data));
   243	}
   244	

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