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Message-ID: <202408091329.zC0XSfdm-lkp@intel.com>
Date: Fri, 9 Aug 2024 13:17:58 +0800
From: kernel test robot <lkp@...el.com>
To: hexue <xue01.he@...sung.com>, axboe@...nel.dk, asml.silence@...il.com
Cc: oe-kbuild-all@...ts.linux.dev, io-uring@...r.kernel.org,
linux-kernel@...r.kernel.org, hexue <xue01.he@...sung.com>
Subject: Re: [PATCH v7 RESENT] io_uring: releasing CPU resources when polling
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@intel.com/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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202408091329.zC0XSfdm-lkp@intel.com/
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
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