Hi Tomasz, I love your patch! Perhaps something to improve: [auto build test WARNING on iio/togreg] [also build test WARNING on robh/for-next linux/master v5.7] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Tomasz-Duszynski/Add-support-for-SCD30-sensor/20200608-020304 base: https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg compiler: gcc-9 (Debian 9.3.0-13) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> cppcheck warnings: (new ones prefixed by >>) >> drivers/iio/chemical/scd30_core.c:93:31: warning: Clarify calculation precedence for '&' and '?'. [clarifyCalculation] sign = float32 & BIT(31) ? -1 : 1, ^ vim +93 drivers/iio/chemical/scd30_core.c 87 88 /* simplified float to fixed point conversion with a scaling factor of 0.01 */ 89 static int scd30_float_to_fp(int float32) 90 { 91 int fraction, shift, 92 mantissa = float32 & GENMASK(22, 0), > 93 sign = float32 & BIT(31) ? -1 : 1, 94 exp = (float32 & ~BIT(31)) >> 23; 95 96 /* special case 0 */ 97 if (!exp && !mantissa) 98 return 0; 99 100 exp -= 127; 101 if (exp < 0) { 102 exp = -exp; 103 /* return values ranging from 1 to 99 */ 104 return sign * ((((BIT(23) + mantissa) * 100) >> 23) >> exp); 105 } 106 107 /* return values starting at 100 */ 108 shift = 23 - exp; 109 float32 = BIT(exp) + (mantissa >> shift); 110 fraction = mantissa & GENMASK(shift - 1, 0); 111 112 return sign * (float32 * 100 + ((fraction * 100) >> shift)); 113 } 114 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
