fs/io_uring.c:2330:40: error: variable 'prev' set but not used

From: kernel test robot
Date: Wed Nov 10 2021 - 15:20:07 EST


tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 89d714ab6043bca7356b5c823f5335f5dce1f930
commit: 6f33b0bc4ea43f5c5ce7b7c9ab66051f80837862 io_uring: use slist for completion batching
date: 3 weeks ago
config: m68k-allyesconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 11.2.0
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
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6f33b0bc4ea43f5c5ce7b7c9ab66051f80837862
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 6f33b0bc4ea43f5c5ce7b7c9ab66051f80837862
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=m68k

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

fs/io_uring.c: In function 'io_queue_async_work':
fs/io_uring.c:1455:61: error: parameter 'locked' set but not used [-Werror=unused-but-set-parameter]
1455 | static void io_queue_async_work(struct io_kiocb *req, bool *locked)
| ~~~~~~^~~~~~
fs/io_uring.c: In function '__io_submit_flush_completions':
>> fs/io_uring.c:2330:40: error: variable 'prev' set but not used [-Werror=unused-but-set-variable]
2330 | struct io_wq_work_node *node, *prev;
| ^~~~
cc1: all warnings being treated as errors


vim +/prev +2330 fs/io_uring.c

2326
2327 static void __io_submit_flush_completions(struct io_ring_ctx *ctx)
2328 __must_hold(&ctx->uring_lock)
2329 {
> 2330 struct io_wq_work_node *node, *prev;
2331 struct io_submit_state *state = &ctx->submit_state;
2332 struct req_batch rb;
2333
2334 spin_lock(&ctx->completion_lock);
2335 wq_list_for_each(node, prev, &state->compl_reqs) {
2336 struct io_kiocb *req = container_of(node, struct io_kiocb,
2337 comp_list);
2338
2339 __io_cqring_fill_event(ctx, req->user_data, req->result,
2340 req->compl.cflags);
2341 }
2342 io_commit_cqring(ctx);
2343 spin_unlock(&ctx->completion_lock);
2344 io_cqring_ev_posted(ctx);
2345
2346 io_init_req_batch(&rb);
2347 node = state->compl_reqs.first;
2348 do {
2349 struct io_kiocb *req = container_of(node, struct io_kiocb,
2350 comp_list);
2351
2352 node = req->comp_list.next;
2353 if (req_ref_put_and_test(req))
2354 io_req_free_batch(&rb, req, &ctx->submit_state);
2355 } while (node);
2356
2357 io_req_free_batch_finish(ctx, &rb);
2358 INIT_WQ_LIST(&state->compl_reqs);
2359 }
2360

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

Attachment: .config.gz
Description: application/gzip