[kbuild-all] [axboe-block:for-5.16/io_uring 78/79] fs/io_uring.c:5577:6: warning: variable 'rw' set but not used

tree: https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-5.16/io_uring head: 785d7baa96560c726b68d591a233532f1a203743 commit: 7070f9ad7468e52c5bd36c6270aa4c6466f6bbf3 [78/79] io_uring: arm poll for non-nowait files config: i386-randconfig-r022-20211016 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project a49f5386ce6b091da66ea7c3a1d9a588d53becf7) 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/axboe/linux-block.git/com... git remote add axboe-block https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git git fetch --no-tags axboe-block for-5.16/io_uring git checkout 7070f9ad7468e52c5bd36c6270aa4c6466f6bbf3 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): fs/io_uring.c:1489:61: warning: parameter 'locked' set but not used [-Wunused-but-set-parameter] static void io_queue_async_work(struct io_kiocb *req, bool *locked) ^ int rw; ^ 2 warnings generated. vim +/rw +5577 fs/io_uring.c 59b735aeeb0f23 Olivier Langlois 2021-06-22 5569 59b735aeeb0f23 Olivier Langlois 2021-06-22 5570 static int io_arm_poll_handler(struct io_kiocb *req) d7718a9d25a614 Jens Axboe 2020-02-14 5571 { d7718a9d25a614 Jens Axboe 2020-02-14 5572 const struct io_op_def *def = &io_op_defs[req->opcode]; d7718a9d25a614 Jens Axboe 2020-02-14 5573 struct io_ring_ctx *ctx = req->ctx; d7718a9d25a614 Jens Axboe 2020-02-14 5574 struct async_poll *apoll; d7718a9d25a614 Jens Axboe 2020-02-14 5575 struct io_poll_table ipt; b2d9c3da77115b Pavel Begunkov 2021-06-26 5576 __poll_t ret, mask = EPOLLONESHOT | POLLERR | POLLPRI; 9dab14b81807a4 Jens Axboe 2020-08-25 @5577 int rw; d7718a9d25a614 Jens Axboe 2020-02-14 5578 d7718a9d25a614 Jens Axboe 2020-02-14 5579 if (!req->file || !file_can_poll(req->file)) 59b735aeeb0f23 Olivier Langlois 2021-06-22 5580 return IO_APOLL_ABORTED; 24c74678634b3c Pavel Begunkov 2020-06-21 5581 if (req->flags & REQ_F_POLLED) 59b735aeeb0f23 Olivier Langlois 2021-06-22 5582 return IO_APOLL_ABORTED; b2d9c3da77115b Pavel Begunkov 2021-06-26 5583 if (!def->pollin && !def->pollout) b2d9c3da77115b Pavel Begunkov 2021-06-26 5584 return IO_APOLL_ABORTED; b2d9c3da77115b Pavel Begunkov 2021-06-26 5585 b2d9c3da77115b Pavel Begunkov 2021-06-26 5586 if (def->pollin) { 9dab14b81807a4 Jens Axboe 2020-08-25 5587 rw = READ; b2d9c3da77115b Pavel Begunkov 2021-06-26 5588 mask |= POLLIN | POLLRDNORM; b2d9c3da77115b Pavel Begunkov 2021-06-26 5589 b2d9c3da77115b Pavel Begunkov 2021-06-26 5590 /* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */ b2d9c3da77115b Pavel Begunkov 2021-06-26 5591 if ((req->opcode == IORING_OP_RECVMSG) && b2d9c3da77115b Pavel Begunkov 2021-06-26 5592 (req->sr_msg.msg_flags & MSG_ERRQUEUE)) b2d9c3da77115b Pavel Begunkov 2021-06-26 5593 mask &= ~POLLIN; b2d9c3da77115b Pavel Begunkov 2021-06-26 5594 } else { 9dab14b81807a4 Jens Axboe 2020-08-25 5595 rw = WRITE; b2d9c3da77115b Pavel Begunkov 2021-06-26 5596 mask |= POLLOUT | POLLWRNORM; b2d9c3da77115b Pavel Begunkov 2021-06-26 5597 } b2d9c3da77115b Pavel Begunkov 2021-06-26 5598 d7718a9d25a614 Jens Axboe 2020-02-14 5599 apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC); d7718a9d25a614 Jens Axboe 2020-02-14 5600 if (unlikely(!apoll)) 59b735aeeb0f23 Olivier Langlois 2021-06-22 5601 return IO_APOLL_ABORTED; 807abcb0883439 Jens Axboe 2020-07-17 5602 apoll->double_poll = NULL; d7718a9d25a614 Jens Axboe 2020-02-14 5603 req->apoll = apoll; b2d9c3da77115b Pavel Begunkov 2021-06-26 5604 req->flags |= REQ_F_POLLED; d7718a9d25a614 Jens Axboe 2020-02-14 5605 ipt.pt._qproc = io_async_queue_proc; 48dcd38d73c22b Pavel Begunkov 2021-08-15 5606 io_req_set_refcount(req); d7718a9d25a614 Jens Axboe 2020-02-14 5607 d7718a9d25a614 Jens Axboe 2020-02-14 5608 ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask, d7718a9d25a614 Jens Axboe 2020-02-14 5609 io_async_wake); 79ebeaee8a21a0 Jens Axboe 2021-08-10 5610 spin_unlock(&ctx->completion_lock); 41a5169c23ebe8 Hao Xu 2021-08-12 5611 if (ret || ipt.error) 41a5169c23ebe8 Hao Xu 2021-08-12 5612 return ret ? IO_APOLL_READY : IO_APOLL_ABORTED; 41a5169c23ebe8 Hao Xu 2021-08-12 5613 236daeae3616b1 Olivier Langlois 2021-05-31 5614 trace_io_uring_poll_arm(ctx, req, req->opcode, req->user_data, 236daeae3616b1 Olivier Langlois 2021-05-31 5615 mask, apoll->poll.events); 59b735aeeb0f23 Olivier Langlois 2021-06-22 5616 return IO_APOLL_OK; d7718a9d25a614 Jens Axboe 2020-02-14 5617 } d7718a9d25a614 Jens Axboe 2020-02-14 5618 :::::: The code at line 5577 was first introduced by commit :::::: 9dab14b81807a40dab8e464ec87043935c562c2c io_uring: don't use poll handler if file can't be nonblocking read/written :::::: TO: Jens Axboe <axboe(a)kernel.dk&gt; :::::: CC: Jens Axboe <axboe(a)kernel.dk&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org