Hi David, kernel test robot noticed the following build warnings: [auto build test WARNING on next-20241121] url: https://github.com/intel-lab-lkp/linux/commits/David-Laight/minmax-h-Add-whitespace-around-operators-and-after-commas/20241121-152617 base: next-20241121 patch link: https://lore.kernel.org/r/8f69f4deac014f558bab186444bac2e8%40AcuMS.aculab.com patch subject: [PATCH next 6/7] minmax.h: Simplify the variants of clamp() config: loongarch-allyesconfig (https://download.01.org/0day-ci/archive/20241123/202411230458.dhZwh3TT-lkp@xxxxxxxxx/config) compiler: loongarch64-linux-gcc (GCC) 14.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241123/202411230458.dhZwh3TT-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202411230458.dhZwh3TT-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): In file included from include/linux/kernel.h:28, from include/linux/cpumask.h:11, from arch/loongarch/include/asm/processor.h:9, from arch/loongarch/include/asm/thread_info.h:15, from include/linux/thread_info.h:60, from include/asm-generic/current.h:6, from ./arch/loongarch/include/generated/asm/current.h:1, from include/linux/sched.h:12, from include/linux/delay.h:13, from drivers/iio/magnetometer/yamaha-yas530.c:27: drivers/iio/magnetometer/yamaha-yas530.c: In function 'yas537_measure': >> include/linux/minmax.h:188:20: warning: overflow in conversion from 'long unsigned int' to 's32' {aka 'int'} changes value from '18446744073709543424' to '-8192' [-Woverflow] 188 | type ulo = (lo); \ | ^ include/linux/minmax.h:197:9: note: in expansion of macro '__clamp_once' 197 | __clamp_once(type, val, lo, hi, __UNIQUE_ID(v_), __UNIQUE_ID(l_), __UNIQUE_ID(h_)) | ^~~~~~~~~~~~ include/linux/minmax.h:233:32: note: in expansion of macro '__careful_clamp' 233 | #define clamp_val(val, lo, hi) __careful_clamp(typeof(val), val, lo, hi) | ^~~~~~~~~~~~~~~ drivers/iio/magnetometer/yamaha-yas530.c:414:25: note: in expansion of macro 'clamp_val' 414 | clamp_val(h[i], -BIT(13), BIT(13) - 1); | ^~~~~~~~~ vim +188 include/linux/minmax.h 172 173 /** 174 * min_not_zero - return the minimum that is _not_ zero, unless both are zero 175 * @x: value1 176 * @y: value2 177 */ 178 #define min_not_zero(x, y) ({ \ 179 typeof(x) __x = (x); \ 180 typeof(y) __y = (y); \ 181 __x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); }) 182 183 #define __clamp(val, lo, hi) \ 184 ((val) >= (hi) ? (hi) : ((val) <= (lo) ? (lo) : (val))) 185 186 #define __clamp_once(type, val, lo, hi, uval, ulo, uhi) ({ \ 187 type uval = (val); \ > 188 type ulo = (lo); \ 189 type uhi = (hi); \ 190 BUILD_BUG_ON_MSG(statically_true(ulo > uhi), \ 191 "clamp() low limit " #lo " greater than high limit " #hi); \ 192 BUILD_BUG_ON_MSG(!__types_ok3(uval, ulo, uhi), \ 193 "clamp("#val", "#lo", "#hi") signedness error"); \ 194 __clamp(uval, ulo, uhi); }) 195 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
