Hi Andreas, I love your patch! Perhaps something to improve: [auto build test WARNING on iio/togreg] [also build test WARNING on robh/for-next linus/master v5.14-rc3 next-20210727] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Andreas-Klinger/iio-chemical-Add-support-for-sgp40-gas-sensor/20210728-003718 base: https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg config: i386-allyesconfig (attached as .config) compiler: gcc-10 (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/6e2c78f8b661002ac418f2782ddc79352b6f04a3 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Andreas-Klinger/iio-chemical-Add-support-for-sgp40-gas-sensor/20210728-003718 git checkout 6e2c78f8b661002ac418f2782ddc79352b6f04a3 # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/iio/chemical/sgp40.c:67:5: warning: no previous prototype for 'sqp40_exp100' [-Wmissing-prototypes] 67 | int sqp40_exp100(int n) | ^~~~~~~~~~~~ vim +/sqp40_exp100 +67 drivers/iio/chemical/sgp40.c 60 61 /* 62 * calculate e^x where n is the exponent multiplied with 100 63 * 64 * use taylor approximation which is accurate enough for the purpose of 65 * coming out with just 500 index points. 66 */ > 67 int sqp40_exp100(int n) 68 { 69 int x, xn, y, z; 70 int s = 1; 71 72 if (n < 0) { 73 s = -1; 74 n *= -1; 75 } 76 77 x = n; 78 79 y = 100 + x; 80 xn = x * x; 81 y += xn / 2 / 100; 82 xn = x * x * x; 83 y += xn / 6 / 10000; 84 xn = x * x * x * x; 85 y += xn / 24 / 1000000; 86 87 if (s == -1) 88 z = 10000 / y; 89 else 90 z = y; 91 92 return z; 93 } 94 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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