fs/io_uring.c:5465:65: sparse: sparse: incorrect type in argument 1 (different base types)
From: kernel test robot
Date: Tue Jan 25 2022 - 01:06:55 EST
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: dd81e1c7d5fb126e5fbc5c9e334d7b3ec29a16a0
commit: aa43477b040251f451db0d844073ac00a8ab66ee io_uring: poll rework
date: 4 weeks ago
config: csky-randconfig-s032-20220120 (https://download.01.org/0day-ci/archive/20220125/202201251339.3yJhTpLS-lkp@xxxxxxxxx/config)
compiler: csky-linux-gcc (GCC) 11.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.4-dirty
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=aa43477b040251f451db0d844073ac00a8ab66ee
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout aa43477b040251f451db0d844073ac00a8ab66ee
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=csky SHELL=/bin/bash
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
sparse warnings: (new ones prefixed by >>)
fs/io_uring.c:3196:24: sparse: sparse: incorrect type in return expression (different address spaces) @@ expected void [noderef] __user * @@ got struct io_buffer *[assigned] kbuf @@
fs/io_uring.c:3196:24: sparse: expected void [noderef] __user *
fs/io_uring.c:3196:24: sparse: got struct io_buffer *[assigned] kbuf
fs/io_uring.c:4740:14: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct file *file @@ got struct file [noderef] __rcu * @@
fs/io_uring.c:4740:14: sparse: expected struct file *file
fs/io_uring.c:4740:14: sparse: got struct file [noderef] __rcu *
fs/io_uring.c:5460:37: sparse: sparse: incorrect type in assignment (different base types) @@ expected unsigned int [usertype] result @@ got restricted __poll_t @@
fs/io_uring.c:5460:37: sparse: expected unsigned int [usertype] result
fs/io_uring.c:5460:37: sparse: got restricted __poll_t
fs/io_uring.c:5465:71: sparse: sparse: restricted __poll_t degrades to integer
>> fs/io_uring.c:5465:65: sparse: sparse: incorrect type in argument 1 (different base types) @@ expected restricted __poll_t [usertype] val @@ got unsigned int @@
fs/io_uring.c:5465:65: sparse: expected restricted __poll_t [usertype] val
fs/io_uring.c:5465:65: sparse: got unsigned int
>> fs/io_uring.c:5465:52: sparse: sparse: incorrect type in initializer (different base types) @@ expected restricted __poll_t [usertype] mask @@ got unsigned short @@
fs/io_uring.c:5465:52: sparse: expected restricted __poll_t [usertype] mask
fs/io_uring.c:5465:52: sparse: got unsigned short
>> fs/io_uring.c:5469:71: sparse: sparse: incorrect type in argument 3 (different base types) @@ expected signed int [usertype] res @@ got restricted __poll_t [usertype] mask @@
fs/io_uring.c:5469:71: sparse: expected signed int [usertype] res
fs/io_uring.c:5469:71: sparse: got restricted __poll_t [usertype] mask
fs/io_uring.c:5499:66: sparse: sparse: restricted __poll_t degrades to integer
fs/io_uring.c:5499:55: sparse: sparse: incorrect type in argument 1 (different base types) @@ expected restricted __poll_t [usertype] val @@ got unsigned int @@
fs/io_uring.c:5499:55: sparse: expected restricted __poll_t [usertype] val
fs/io_uring.c:5499:55: sparse: got unsigned int
fs/io_uring.c:5572:40: sparse: sparse: incorrect type in argument 2 (different base types) @@ expected int mask @@ got restricted __poll_t [usertype] mask @@
fs/io_uring.c:5572:40: sparse: expected int mask
fs/io_uring.c:5572:40: sparse: got restricted __poll_t [usertype] mask
>> fs/io_uring.c:5658:24: sparse: sparse: incorrect type in return expression (different base types) @@ expected int @@ got restricted __poll_t [assigned] [usertype] mask @@
fs/io_uring.c:5658:24: sparse: expected int
fs/io_uring.c:5658:24: sparse: got restricted __poll_t [assigned] [usertype] mask
fs/io_uring.c:5675:40: sparse: sparse: incorrect type in argument 2 (different base types) @@ expected int mask @@ got restricted __poll_t [assigned] [usertype] mask @@
fs/io_uring.c:5675:40: sparse: expected int mask
fs/io_uring.c:5675:40: sparse: got restricted __poll_t [assigned] [usertype] mask
fs/io_uring.c:5710:25: sparse: sparse: restricted __poll_t degrades to integer
fs/io_uring.c:5710:48: sparse: sparse: incorrect type in initializer (different base types) @@ expected restricted __poll_t [usertype] mask @@ got unsigned int @@
fs/io_uring.c:5710:48: sparse: expected restricted __poll_t [usertype] mask
fs/io_uring.c:5710:48: sparse: got unsigned int
fs/io_uring.c:5719:22: sparse: sparse: invalid assignment: |=
fs/io_uring.c:5719:22: sparse: left side has type restricted __poll_t
fs/io_uring.c:5719:22: sparse: right side has type int
fs/io_uring.c:5724:30: sparse: sparse: invalid assignment: &=
fs/io_uring.c:5724:30: sparse: left side has type restricted __poll_t
fs/io_uring.c:5724:30: sparse: right side has type int
fs/io_uring.c:5726:22: sparse: sparse: invalid assignment: |=
fs/io_uring.c:5726:22: sparse: left side has type restricted __poll_t
fs/io_uring.c:5726:22: sparse: right side has type int
fs/io_uring.c:5742:33: sparse: sparse: incorrect type in argument 5 (different base types) @@ expected int mask @@ got restricted __poll_t [usertype] mask @@
fs/io_uring.c:5742:33: sparse: expected int mask
fs/io_uring.c:5742:33: sparse: got restricted __poll_t [usertype] mask
fs/io_uring.c:5742:50: sparse: sparse: incorrect type in argument 6 (different base types) @@ expected int events @@ got restricted __poll_t [usertype] events @@
fs/io_uring.c:5742:50: sparse: expected int events
fs/io_uring.c:5742:50: sparse: got restricted __poll_t [usertype] events
fs/io_uring.c:5823:24: sparse: sparse: invalid assignment: |=
fs/io_uring.c:5823:24: sparse: left side has type unsigned int
fs/io_uring.c:5823:24: sparse: right side has type restricted __poll_t
fs/io_uring.c:5824:65: sparse: sparse: restricted __poll_t degrades to integer
fs/io_uring.c:5824:29: sparse: sparse: restricted __poll_t degrades to integer
fs/io_uring.c:5824:38: sparse: sparse: incorrect type in return expression (different base types) @@ expected restricted __poll_t @@ got unsigned int @@
fs/io_uring.c:5824:38: sparse: expected restricted __poll_t
fs/io_uring.c:5824:38: sparse: got unsigned int
fs/io_uring.c:5913:43: sparse: sparse: invalid assignment: &=
fs/io_uring.c:5913:43: sparse: left side has type restricted __poll_t
fs/io_uring.c:5913:43: sparse: right side has type int
fs/io_uring.c:5914:62: sparse: sparse: restricted __poll_t degrades to integer
fs/io_uring.c:5914:43: sparse: sparse: invalid assignment: |=
fs/io_uring.c:5914:43: sparse: left side has type restricted __poll_t
fs/io_uring.c:5914:43: sparse: right side has type unsigned int
fs/io_uring.c:2241:17: sparse: sparse: context imbalance in 'handle_prev_tw_list' - different lock contexts for basic block
fs/io_uring.c:7945:9: sparse: sparse: context imbalance in 'io_sq_thread_unpark' - wrong count at exit
fs/io_uring.c:7956:9: sparse: sparse: context imbalance in 'io_sq_thread_park' - wrong count at exit
vim +5465 fs/io_uring.c
5429
5430 /*
5431 * All poll tw should go through this. Checks for poll events, manages
5432 * references, does rewait, etc.
5433 *
5434 * Returns a negative error on failure. >0 when no action require, which is
5435 * either spurious wakeup or multishot CQE is served. 0 when it's done with
5436 * the request, then the mask is stored in req->result.
5437 */
5438 static int io_poll_check_events(struct io_kiocb *req)
5439 {
5440 struct io_ring_ctx *ctx = req->ctx;
5441 struct io_poll_iocb *poll = io_poll_get_single(req);
5442 int v;
5443
5444 /* req->task == current here, checking PF_EXITING is safe */
5445 if (unlikely(req->task->flags & PF_EXITING))
5446 io_poll_mark_cancelled(req);
5447
5448 do {
5449 v = atomic_read(&req->poll_refs);
5450
5451 /* tw handler should be the owner, and so have some references */
5452 if (WARN_ON_ONCE(!(v & IO_POLL_REF_MASK)))
5453 return 0;
5454 if (v & IO_POLL_CANCEL_FLAG)
5455 return -ECANCELED;
5456
5457 if (!req->result) {
5458 struct poll_table_struct pt = { ._key = poll->events };
5459
5460 req->result = vfs_poll(req->file, &pt) & poll->events;
5461 }
5462
5463 /* multishot, just fill an CQE and proceed */
5464 if (req->result && !(poll->events & EPOLLONESHOT)) {
> 5465 __poll_t mask = mangle_poll(req->result & poll->events);
5466 bool filled;
5467
5468 spin_lock(&ctx->completion_lock);
> 5469 filled = io_fill_cqe_aux(ctx, req->user_data, mask,
5470 IORING_CQE_F_MORE);
5471 io_commit_cqring(ctx);
5472 spin_unlock(&ctx->completion_lock);
5473 if (unlikely(!filled))
5474 return -ECANCELED;
5475 io_cqring_ev_posted(ctx);
5476 } else if (req->result) {
5477 return 0;
5478 }
5479
5480 /*
5481 * Release all references, retry if someone tried to restart
5482 * task_work while we were executing it.
5483 */
5484 } while (atomic_sub_return(v & IO_POLL_REF_MASK, &req->poll_refs));
5485
5486 return 1;
5487 }
5488
5489 static void io_poll_task_func(struct io_kiocb *req, bool *locked)
5490 {
5491 struct io_ring_ctx *ctx = req->ctx;
5492 int ret;
5493
5494 ret = io_poll_check_events(req);
5495 if (ret > 0)
5496 return;
5497
5498 if (!ret) {
5499 req->result = mangle_poll(req->result & req->poll.events);
5500 } else {
5501 req->result = ret;
5502 req_set_fail(req);
5503 }
5504
5505 io_poll_remove_entries(req);
5506 spin_lock(&ctx->completion_lock);
5507 hash_del(&req->hash_node);
5508 __io_req_complete_post(req, req->result, 0);
5509 io_commit_cqring(ctx);
5510 spin_unlock(&ctx->completion_lock);
5511 io_cqring_ev_posted(ctx);
5512 }
5513
5514 static void io_apoll_task_func(struct io_kiocb *req, bool *locked)
5515 {
5516 struct io_ring_ctx *ctx = req->ctx;
5517 int ret;
5518
5519 ret = io_poll_check_events(req);
5520 if (ret > 0)
5521 return;
5522
5523 io_poll_remove_entries(req);
5524 spin_lock(&ctx->completion_lock);
5525 hash_del(&req->hash_node);
5526 spin_unlock(&ctx->completion_lock);
5527
5528 if (!ret)
5529 io_req_task_submit(req, locked);
5530 else
5531 io_req_complete_failed(req, ret);
5532 }
5533
5534 static void __io_poll_execute(struct io_kiocb *req, int mask)
5535 {
5536 req->result = mask;
5537 if (req->opcode == IORING_OP_POLL_ADD)
5538 req->io_task_work.func = io_poll_task_func;
5539 else
5540 req->io_task_work.func = io_apoll_task_func;
5541
5542 trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask);
5543 io_req_task_work_add(req, false);
5544 }
5545
5546 static inline void io_poll_execute(struct io_kiocb *req, int res)
5547 {
5548 if (io_poll_get_ownership(req))
5549 __io_poll_execute(req, res);
5550 }
5551
5552 static void io_poll_cancel_req(struct io_kiocb *req)
5553 {
5554 io_poll_mark_cancelled(req);
5555 /* kick tw, which should complete the request */
5556 io_poll_execute(req, 0);
5557 }
5558
5559 static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
5560 void *key)
5561 {
5562 struct io_kiocb *req = wait->private;
5563 struct io_poll_iocb *poll = container_of(wait, struct io_poll_iocb,
5564 wait);
5565 __poll_t mask = key_to_poll(key);
5566
5567 /* for instances that support it check for an event match first */
5568 if (mask && !(mask & poll->events))
5569 return 0;
5570
5571 if (io_poll_get_ownership(req))
5572 __io_poll_execute(req, mask);
5573 return 1;
5574 }
5575
5576 static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt,
5577 struct wait_queue_head *head,
5578 struct io_poll_iocb **poll_ptr)
5579 {
5580 struct io_kiocb *req = pt->req;
5581
5582 /*
5583 * The file being polled uses multiple waitqueues for poll handling
5584 * (e.g. one for read, one for write). Setup a separate io_poll_iocb
5585 * if this happens.
5586 */
5587 if (unlikely(pt->nr_entries)) {
5588 struct io_poll_iocb *first = poll;
5589
5590 /* double add on the same waitqueue head, ignore */
5591 if (first->head == head)
5592 return;
5593 /* already have a 2nd entry, fail a third attempt */
5594 if (*poll_ptr) {
5595 if ((*poll_ptr)->head == head)
5596 return;
5597 pt->error = -EINVAL;
5598 return;
5599 }
5600
5601 poll = kmalloc(sizeof(*poll), GFP_ATOMIC);
5602 if (!poll) {
5603 pt->error = -ENOMEM;
5604 return;
5605 }
5606 io_init_poll_iocb(poll, first->events, first->wait.func);
5607 *poll_ptr = poll;
5608 if (req->opcode == IORING_OP_POLL_ADD)
5609 req->flags |= REQ_F_ASYNC_DATA;
5610 }
5611
5612 pt->nr_entries++;
5613 poll->head = head;
5614 poll->wait.private = req;
5615
5616 if (poll->events & EPOLLEXCLUSIVE)
5617 add_wait_queue_exclusive(head, &poll->wait);
5618 else
5619 add_wait_queue(head, &poll->wait);
5620 }
5621
5622 static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head,
5623 struct poll_table_struct *p)
5624 {
5625 struct io_poll_table *pt = container_of(p, struct io_poll_table, pt);
5626
5627 __io_queue_proc(&pt->req->poll, pt, head,
5628 (struct io_poll_iocb **) &pt->req->async_data);
5629 }
5630
5631 static int __io_arm_poll_handler(struct io_kiocb *req,
5632 struct io_poll_iocb *poll,
5633 struct io_poll_table *ipt, __poll_t mask)
5634 {
5635 struct io_ring_ctx *ctx = req->ctx;
5636 int v;
5637
5638 INIT_HLIST_NODE(&req->hash_node);
5639 io_init_poll_iocb(poll, mask, io_poll_wake);
5640 poll->file = req->file;
5641 poll->wait.private = req;
5642
5643 ipt->pt._key = mask;
5644 ipt->req = req;
5645 ipt->error = 0;
5646 ipt->nr_entries = 0;
5647
5648 /*
5649 * Take the ownership to delay any tw execution up until we're done
5650 * with poll arming. see io_poll_get_ownership().
5651 */
5652 atomic_set(&req->poll_refs, 1);
5653 mask = vfs_poll(req->file, &ipt->pt) & poll->events;
5654
5655 if (mask && (poll->events & EPOLLONESHOT)) {
5656 io_poll_remove_entries(req);
5657 /* no one else has access to the req, forget about the ref */
> 5658 return mask;
5659 }
5660 if (!mask && unlikely(ipt->error || !ipt->nr_entries)) {
5661 io_poll_remove_entries(req);
5662 if (!ipt->error)
5663 ipt->error = -EINVAL;
5664 return 0;
5665 }
5666
5667 spin_lock(&ctx->completion_lock);
5668 io_poll_req_insert(req);
5669 spin_unlock(&ctx->completion_lock);
5670
5671 if (mask) {
5672 /* can't multishot if failed, just queue the event we've got */
5673 if (unlikely(ipt->error || !ipt->nr_entries))
5674 poll->events |= EPOLLONESHOT;
5675 __io_poll_execute(req, mask);
5676 return 0;
5677 }
5678
5679 /*
5680 * Release ownership. If someone tried to queue a tw while it was
5681 * locked, kick it off for them.
5682 */
5683 v = atomic_dec_return(&req->poll_refs);
5684 if (unlikely(v & IO_POLL_REF_MASK))
5685 __io_poll_execute(req, 0);
5686 return 0;
5687 }
5688
---
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