tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-5.10 head: 9ced6633127bd25a94939777d9ecda54800859fc commit: 75a2698c924a9065cc53174004ef4aabfd6eb3c1 [62/74] io_uring: further simplify do_read error parsing config: powerpc-randconfig-r002-20210318 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 6db3ab2903f42712f44000afb5aa467efbd25f35) 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 # install powerpc cross compiling tool for clang build # apt-get install binutils-powerpc-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git/c... git remote add sashal-linux-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git git fetch --no-tags sashal-linux-stable queue-5.10 git checkout 75a2698c924a9065cc53174004ef4aabfd6eb3c1 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang 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 >>): goto copy_iov; ^ fs/io_uring.c:4275:22: error: use of undeclared identifier 'IO_WQ_WORK_NO_CANCEL'; did you mean 'IO_WQ_WORK_CANCEL'? req->work.flags |= IO_WQ_WORK_NO_CANCEL; ^~~~~~~~~~~~~~~~~~~~ IO_WQ_WORK_CANCEL fs/io-wq.h:9:2: note: 'IO_WQ_WORK_CANCEL' declared here IO_WQ_WORK_CANCEL = 1, ^ fs/io_uring.c:6100:3: error: implicit declaration of function 'io_req_task_work_add_fallback' [-Werror,-Wimplicit-function-declaration] io_req_task_work_add_fallback(req, io_req_task_cancel); ^ fs/io_uring.c:6100:3: note: did you mean 'io_req_task_work_add'? fs/io_uring.c:2027:12: note: 'io_req_task_work_add' declared here static int io_req_task_work_add(struct io_kiocb *req, bool twa_signal_ok) ^ fs/io_uring.c:6101:3: error: non-void function 'io_wq_submit_work' should return a value [-Wreturn-type] return; ^ 4 errors generated. vim +/copy_iov +3427 fs/io_uring.c f67676d160c6ee2 Jens Axboe 2019-12-02 3397 a1d7c393c4711a9 Jens Axboe 2020-06-22 3398 static int io_read(struct io_kiocb *req, bool force_nonblock, a1d7c393c4711a9 Jens Axboe 2020-06-22 3399 struct io_comp_state *cs) 2b188cc1bb857a9 Jens Axboe 2019-01-07 3400 { 2b188cc1bb857a9 Jens Axboe 2019-01-07 3401 struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs; 9adbd45d6d32ffc Jens Axboe 2019-12-20 3402 struct kiocb *kiocb = &req->rw.kiocb; ff6165b2d7f66fc Jens Axboe 2020-08-13 3403 struct iov_iter __iter, *iter = &__iter; e8c2bc1fb6c9495 Jens Axboe 2020-08-15 3404 struct io_async_rw *rw = req->async_data; 227c0c9673d8673 Jens Axboe 2020-08-13 3405 ssize_t io_size, ret, ret2; f5cac8b156e8b7b Jens Axboe 2020-09-14 3406 bool no_async; ff6165b2d7f66fc Jens Axboe 2020-08-13 3407 e8c2bc1fb6c9495 Jens Axboe 2020-08-15 3408 if (rw) e8c2bc1fb6c9495 Jens Axboe 2020-08-15 3409 iter = &rw->iter; 2b188cc1bb857a9 Jens Axboe 2019-01-07 3410 ff6165b2d7f66fc Jens Axboe 2020-08-13 3411 ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock); f67676d160c6ee2 Jens Axboe 2019-12-02 3412 if (ret < 0) 2b188cc1bb857a9 Jens Axboe 2019-01-07 3413 return ret; 758adcb5e98092e Pavel Begunkov 2020-11-07 3414 io_size = iov_iter_count(iter); fa15bafb71fd7a4 Pavel Begunkov 2020-08-01 3415 req->result = io_size; 227c0c9673d8673 Jens Axboe 2020-08-13 3416 ret = 0; 2b188cc1bb857a9 Jens Axboe 2019-01-07 3417 fd6c2e4c063d645 Jens Axboe 2019-12-18 3418 /* Ensure we clear previously set non-block flag */ fd6c2e4c063d645 Jens Axboe 2019-12-18 3419 if (!force_nonblock) 29de5f6a350778a Jens Axboe 2020-02-20 3420 kiocb->ki_flags &= ~IOCB_NOWAIT; a88fc400212fc1d Pavel Begunkov 2020-09-30 3421 else a88fc400212fc1d Pavel Begunkov 2020-09-30 3422 kiocb->ki_flags |= IOCB_NOWAIT; a88fc400212fc1d Pavel Begunkov 2020-09-30 3423 24c74678634b3cb Pavel Begunkov 2020-06-21 3424 /* If the file doesn't support async, just async punt */ f5cac8b156e8b7b Jens Axboe 2020-09-14 3425 no_async = force_nonblock && !io_file_supports_async(req->file, READ); f5cac8b156e8b7b Jens Axboe 2020-09-14 3426 if (no_async) f67676d160c6ee2 Jens Axboe 2019-12-02 @3427 goto copy_iov; 9e645e1105ca60f Jens Axboe 2019-05-10 3428 758adcb5e98092e Pavel Begunkov 2020-11-07 3429 ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), io_size); fa15bafb71fd7a4 Pavel Begunkov 2020-08-01 3430 if (unlikely(ret)) fa15bafb71fd7a4 Pavel Begunkov 2020-08-01 3431 goto out_free; 2b188cc1bb857a9 Jens Axboe 2019-01-07 3432 227c0c9673d8673 Jens Axboe 2020-08-13 3433 ret = io_iter_do_read(req, iter); 32960613b7c3352 Jens Axboe 2019-09-23 3434 d964a45ff1644d5 Pavel Begunkov 2021-02-01 3435 if (ret == -EIOCBQUEUED) { 227c0c9673d8673 Jens Axboe 2020-08-13 3436 ret = 0; f67676d160c6ee2 Jens Axboe 2019-12-02 3437 goto out_free; 227c0c9673d8673 Jens Axboe 2020-08-13 3438 } else if (ret == -EAGAIN) { eefdf30f3dcb5c1 Jens Axboe 2020-08-27 3439 /* IOPOLL retry should happen for io-wq threads */ eefdf30f3dcb5c1 Jens Axboe 2020-08-27 3440 if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL)) f91daf565b0e272 Jens Axboe 2020-08-15 3441 goto done; 355afaeb578abac Jens Axboe 2020-09-02 3442 /* no retry on NONBLOCK marked file */ 355afaeb578abac Jens Axboe 2020-09-02 3443 if (req->file->f_flags & O_NONBLOCK) 355afaeb578abac Jens Axboe 2020-09-02 3444 goto done; 842163154b87b01 Jens Axboe 2020-08-24 3445 /* some cases will consume bytes even on error returns */ 758adcb5e98092e Pavel Begunkov 2020-11-07 3446 iov_iter_revert(iter, io_size - iov_iter_count(iter)); f38c7e3abfba9a9 Jens Axboe 2020-09-25 3447 ret = 0; 75a2698c924a906 Pavel Begunkov 2021-02-04 3448 } else if (ret <= 0 || ret == io_size) { 00d23d516e2e790 Jens Axboe 2020-08-25 3449 /* make sure -ERESTARTSYS -> -EINTR is done */ 00d23d516e2e790 Jens Axboe 2020-08-25 3450 goto done; 75a2698c924a906 Pavel Begunkov 2021-02-04 3451 } else { 75a2698c924a906 Pavel Begunkov 2021-02-04 3452 /* we did blocking attempt. no retry. */ 75a2698c924a906 Pavel Begunkov 2021-02-04 3453 if (!force_nonblock || (req->file->f_flags & O_NONBLOCK) || 75a2698c924a906 Pavel Begunkov 2021-02-04 3454 !(req->flags & REQ_F_ISREG)) 227c0c9673d8673 Jens Axboe 2020-08-13 3455 goto done; 227c0c9673d8673 Jens Axboe 2020-08-13 3456 227c0c9673d8673 Jens Axboe 2020-08-13 3457 io_size -= ret; 75a2698c924a906 Pavel Begunkov 2021-02-04 3458 } 75a2698c924a906 Pavel Begunkov 2021-02-04 3459 227c0c9673d8673 Jens Axboe 2020-08-13 3460 ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true); 227c0c9673d8673 Jens Axboe 2020-08-13 3461 if (ret2) { 227c0c9673d8673 Jens Axboe 2020-08-13 3462 ret = ret2; 227c0c9673d8673 Jens Axboe 2020-08-13 3463 goto out_free; f67676d160c6ee2 Jens Axboe 2019-12-02 3464 } f5cac8b156e8b7b Jens Axboe 2020-09-14 3465 if (no_async) f5cac8b156e8b7b Jens Axboe 2020-09-14 3466 return -EAGAIN; e8c2bc1fb6c9495 Jens Axboe 2020-08-15 3467 rw = req->async_data; 227c0c9673d8673 Jens Axboe 2020-08-13 3468 /* it's copied and will be cleaned with ->io */ 227c0c9673d8673 Jens Axboe 2020-08-13 3469 iovec = NULL; 227c0c9673d8673 Jens Axboe 2020-08-13 3470 /* now use our persistent iterator, if we aren't already */ e8c2bc1fb6c9495 Jens Axboe 2020-08-15 3471 iter = &rw->iter; 227c0c9673d8673 Jens Axboe 2020-08-13 3472 retry: e8c2bc1fb6c9495 Jens Axboe 2020-08-15 3473 rw->bytes_done += ret; 227c0c9673d8673 Jens Axboe 2020-08-13 3474 /* if we can retry, do so with the callbacks armed */ 227c0c9673d8673 Jens Axboe 2020-08-13 3475 if (!io_rw_should_retry(req)) { bcf5a06304d69a3 Jens Axboe 2020-05-22 3476 kiocb->ki_flags &= ~IOCB_WAITQ; f67676d160c6ee2 Jens Axboe 2019-12-02 3477 return -EAGAIN; 2b188cc1bb857a9 Jens Axboe 2019-01-07 3478 } 227c0c9673d8673 Jens Axboe 2020-08-13 3479 227c0c9673d8673 Jens Axboe 2020-08-13 3480 /* 227c0c9673d8673 Jens Axboe 2020-08-13 3481 * Now retry read with the IOCB_WAITQ parts set in the iocb. If we 227c0c9673d8673 Jens Axboe 2020-08-13 3482 * get -EIOCBQUEUED, then we'll get a notification when the desired 227c0c9673d8673 Jens Axboe 2020-08-13 3483 * page gets unlocked. We can also get a partial read here, and if we 227c0c9673d8673 Jens Axboe 2020-08-13 3484 * do, then just retry at the new offset. 227c0c9673d8673 Jens Axboe 2020-08-13 3485 */ 227c0c9673d8673 Jens Axboe 2020-08-13 3486 ret = io_iter_do_read(req, iter); 227c0c9673d8673 Jens Axboe 2020-08-13 3487 if (ret == -EIOCBQUEUED) { 227c0c9673d8673 Jens Axboe 2020-08-13 3488 ret = 0; 227c0c9673d8673 Jens Axboe 2020-08-13 3489 goto out_free; 227c0c9673d8673 Jens Axboe 2020-08-13 3490 } else if (ret > 0 && ret < io_size) { 227c0c9673d8673 Jens Axboe 2020-08-13 3491 /* we got some bytes, but not all. retry. */ 227c0c9673d8673 Jens Axboe 2020-08-13 3492 goto retry; 227c0c9673d8673 Jens Axboe 2020-08-13 3493 } 227c0c9673d8673 Jens Axboe 2020-08-13 3494 done: 227c0c9673d8673 Jens Axboe 2020-08-13 3495 kiocb_done(kiocb, ret, cs); 227c0c9673d8673 Jens Axboe 2020-08-13 3496 ret = 0; f67676d160c6ee2 Jens Axboe 2019-12-02 3497 out_free: f261c16861b8295 Pavel Begunkov 2020-08-20 3498 /* it's reportedly faster than delegating the null check to kfree() */ 252917c30f551e8 Pavel Begunkov 2020-07-13 3499 if (iovec) 2b188cc1bb857a9 Jens Axboe 2019-01-07 3500 kfree(iovec); 2b188cc1bb857a9 Jens Axboe 2019-01-07 3501 return ret; 2b188cc1bb857a9 Jens Axboe 2019-01-07 3502 } 2b188cc1bb857a9 Jens Axboe 2019-01-07 3503 :::::: The code at line 3427 was first introduced by commit :::::: f67676d160c6ee2ed82917fadfed6d29cab8237c io_uring: ensure async punted read/write requests copy iovec :::::: 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