Messages in this thread | | | Date | Mon, 17 Jan 2022 10:19:41 +0000 | From | Jonathan Cameron <> | Subject | Re: 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 |
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On Mon, 17 Jan 2022 18:00:03 +0800 kernel test robot <lkp@intel.com> wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > head: 0c947b893d69231a9add855939da7c66237ab44f > commit: 9374e8f5a38defe90bc65b2decf317c1c62d91dd iio: adc: add ADC driver for the TI TSC2046 controller > date: 8 months ago > config: mips-randconfig-r002-20220116 (https://download.01.org/0day-ci/archive/20220117/202201171718.7ZCI4YeQ-lkp@intel.com/config) > compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c63a3175c2947e8c1a2d3bbe16a8586600705c54) > 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=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 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 drivers/iio/adc/ drivers/usb/gadget/ > > 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/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)); > ^~~~~~~~~
I'm open to suggestions on what (if anything) to do about this one...
Jonathan
> 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) > ^~~~ > include/linux/compiler_types.h:328:22: note: expanded from macro 'compiletime_assert' > _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) > ^~~~~~~~~ > include/linux/compiler_types.h:316:23: note: expanded from macro '_compiletime_assert' > __compiletime_assert(condition, msg, prefix, suffix) > ^~~~~~~~~ > include/linux/compiler_types.h:308:9: note: expanded from macro '__compiletime_assert' > if (!(condition)) \ > ^~~~~~~~~ > 1 warning 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 > > --- > 0-DAY CI Kernel Test Service, Intel Corporation > https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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