Hi Leon, Thank you for the patch! Yet something to improve: [auto build test ERROR on rdma/for-next] [also build test ERROR on v5.9-rc6 next-20200921] [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/Leon-Romanovsky/Query-GID-table-... base: https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git for-next config: powerpc-allyesconfig (attached as .config) compiler: powerpc64-linux-gcc (GCC) 9.3.0 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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from drivers/infiniband/core/uverbs_std_types_device.c:6: include/linux/overflow.h: In function 'array_size': 258 | return SIZE_MAX; | ^~~~~~~~ include/linux/overflow.h:6:1: note: 'SIZE_MAX' is defined in header '<stdint.h>'; did you forget to '#include <stdint.h>'? 5 | #include <linux/compiler.h> +++ |+#include <stdint.h> 6 | include/linux/overflow.h:258:10: note: each undeclared identifier is reported only once for each function it appears in 258 | return SIZE_MAX; | ^~~~~~~~ include/linux/overflow.h: In function 'array3_size': include/linux/overflow.h:280:10: error: 'SIZE_MAX' undeclared (first use in this function) 280 | return SIZE_MAX; | ^~~~~~~~ include/linux/overflow.h:280:10: note: 'SIZE_MAX' is defined in header '<stdint.h>'; did you forget to '#include <stdint.h>'? include/linux/overflow.h: In function '__ab_c_size': include/linux/overflow.h:296:10: error: 'SIZE_MAX' undeclared (first use in this function) 296 | return SIZE_MAX; | ^~~~~~~~ include/linux/overflow.h:296:10: note: 'SIZE_MAX' is defined in header '<stdint.h>'; did you forget to '#include <stdint.h>'? # https://github.com/0day-ci/linux/commit/082d45775dab3e83c7cb69b1839f51f1a... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Leon-Romanovsky/Query-GID-table-API/20200922-162843 git checkout 082d45775dab3e83c7cb69b1839f51f1a5e845ef vim +/SIZE_MAX +258 include/linux/overflow.h 0c66847793d198 Jason Gunthorpe 2018-08-01 241 610b15c50e86eb Kees Cook 2018-05-07 242 /** 610b15c50e86eb Kees Cook 2018-05-07 243 * array_size() - Calculate size of 2-dimensional array. 610b15c50e86eb Kees Cook 2018-05-07 244 * 610b15c50e86eb Kees Cook 2018-05-07 245 * @a: dimension one 610b15c50e86eb Kees Cook 2018-05-07 246 * @b: dimension two 610b15c50e86eb Kees Cook 2018-05-07 247 * 610b15c50e86eb Kees Cook 2018-05-07 248 * Calculates size of 2-dimensional array: @a * @b. 610b15c50e86eb Kees Cook 2018-05-07 249 * 610b15c50e86eb Kees Cook 2018-05-07 250 * Returns: number of bytes needed to represent the array or SIZE_MAX on 610b15c50e86eb Kees Cook 2018-05-07 251 * overflow. 610b15c50e86eb Kees Cook 2018-05-07 252 */ 610b15c50e86eb Kees Cook 2018-05-07 253 static inline __must_check size_t array_size(size_t a, size_t b) 610b15c50e86eb Kees Cook 2018-05-07 254 { 610b15c50e86eb Kees Cook 2018-05-07 255 size_t bytes; 610b15c50e86eb Kees Cook 2018-05-07 256 610b15c50e86eb Kees Cook 2018-05-07 257 if (check_mul_overflow(a, b, &bytes)) 610b15c50e86eb Kees Cook 2018-05-07 @258 return SIZE_MAX; 610b15c50e86eb Kees Cook 2018-05-07 259 610b15c50e86eb Kees Cook 2018-05-07 260 return bytes; 610b15c50e86eb Kees Cook 2018-05-07 261 } 610b15c50e86eb Kees Cook 2018-05-07 262 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org