Hi hexue, kernel test robot noticed the following build warnings: [auto build test WARNING on linus/master] [also build test WARNING on v6.11-rc2 next-20240808] [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#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/hexue/io_uring-releasing-CPU-resources-when-polling/20240808-153455 base: linus/master patch link: https://lore.kernel.org/r/20240808071712.2429842-1-xue01.he%40samsung.com patch subject: [PATCH v7 RESENT] io_uring: releasing CPU resources when polling config: x86_64-randconfig-161-20240809 (https://download.01.org/0day-ci/archive/20240809/202408091329.zC0XSfdm-lkp@xxxxxxxxx/config) compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1) 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/202408091329.zC0XSfdm-lkp@xxxxxxxxx/ smatch warnings: io_uring/rw.c:1183 io_uring_hybrid_poll() warn: unsigned 'runtime' is never less than zero. vim +/runtime +1183 io_uring/rw.c 1171 1172 static int io_uring_hybrid_poll(struct io_kiocb *req, 1173 struct io_comp_batch *iob, unsigned int poll_flags) 1174 { 1175 struct io_ring_ctx *ctx = req->ctx; 1176 int ret; 1177 u64 runtime, sleep_time; 1178 1179 sleep_time = io_delay(ctx, req); 1180 ret = io_uring_classic_poll(req, iob, poll_flags); 1181 req->iopoll_end = ktime_get_ns(); 1182 runtime = req->iopoll_end - req->iopoll_start - sleep_time; > 1183 if (runtime < 0) 1184 return 0; 1185 1186 /* use minimize sleep time if there are different speed 1187 * drivers, it could get more completions from fast one 1188 */ 1189 if (ctx->available_time > runtime) 1190 ctx->available_time = runtime; 1191 return ret; 1192 } 1193 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
