[ammarfaizi2-block:axboe/linux-block/for-5.20/io_uring 8/40] io_uring/io_uring.c:6701:38: sparse: sparse: incorrect type in assignment (different base types)

From: kernel test robot
Date: Wed May 25 2022 - 02:34:19 EST

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tree: https://github.com/ammarfaizi2/linux-block axboe/linux-block/for-5.20/io_uring
head: 9da4fba4e0165c5e40d689eb5d34b73d780bf067
commit: 4ad7740c8e760244c249fff910d82f4fcf214bda [8/40] io_uring: move to separate directory
config: x86_64-randconfig-s021 (https://download.01.org/0day-ci/archive/20220525/202205251432.irxNkGpU-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.3.0-1) 11.3.0
reproduce:
# apt-get install sparse
# sparse version: v0.6.4-14-g5a0004b5-dirty
# https://github.com/ammarfaizi2/linux-block/commit/4ad7740c8e760244c249fff910d82f4fcf214bda
git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
git fetch --no-tags ammarfaizi2-block axboe/linux-block/for-5.20/io_uring
git checkout 4ad7740c8e760244c249fff910d82f4fcf214bda
# save the config file
mkdir build_dir && cp config build_dir/.config
make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash

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

sparse warnings: (new ones prefixed by >>)
io_uring/io_uring.c:204:37: sparse: sparse: array of flexible structures
>> io_uring/io_uring.c:6701:38: sparse: sparse: incorrect type in assignment (different base types) @@ expected signed int [usertype] res @@ got restricted __poll_t @@
io_uring/io_uring.c:6701:38: sparse: expected signed int [usertype] res
io_uring/io_uring.c:6701:38: sparse: got restricted __poll_t
>> io_uring/io_uring.c:6712:56: sparse: sparse: restricted __poll_t degrades to integer
>> io_uring/io_uring.c:6711:66: sparse: sparse: incorrect type in argument 1 (different base types) @@ expected restricted __poll_t [usertype] val @@ got unsigned int @@
io_uring/io_uring.c:6711:66: sparse: expected restricted __poll_t [usertype] val
io_uring/io_uring.c:6711:66: sparse: got unsigned int
>> io_uring/io_uring.c:6711:52: sparse: sparse: incorrect type in initializer (different base types) @@ expected restricted __poll_t [usertype] mask @@ got unsigned short @@
io_uring/io_uring.c:6711:52: sparse: expected restricted __poll_t [usertype] mask
io_uring/io_uring.c:6711:52: sparse: got unsigned short
>> io_uring/io_uring.c:6717:50: sparse: sparse: incorrect type in argument 3 (different base types) @@ expected signed int [usertype] res @@ got restricted __poll_t [usertype] mask @@
io_uring/io_uring.c:6717:50: sparse: expected signed int [usertype] res
io_uring/io_uring.c:6717:50: sparse: got restricted __poll_t [usertype] mask
io_uring/io_uring.c:6754:68: sparse: sparse: restricted __poll_t degrades to integer
io_uring/io_uring.c:6754:57: sparse: sparse: incorrect type in argument 1 (different base types) @@ expected restricted __poll_t [usertype] val @@ got unsigned int @@
io_uring/io_uring.c:6754:57: sparse: expected restricted __poll_t [usertype] val
io_uring/io_uring.c:6754:57: sparse: got unsigned int
>> io_uring/io_uring.c:6872:40: sparse: sparse: incorrect type in argument 2 (different base types) @@ expected int mask @@ got restricted __poll_t [usertype] mask @@
io_uring/io_uring.c:6872:40: sparse: expected int mask
io_uring/io_uring.c:6872:40: sparse: got restricted __poll_t [usertype] mask
>> io_uring/io_uring.c:6964:24: sparse: sparse: incorrect type in return expression (different base types) @@ expected int @@ got restricted __poll_t [assigned] [usertype] mask @@
io_uring/io_uring.c:6964:24: sparse: expected int
io_uring/io_uring.c:6964:24: sparse: got restricted __poll_t [assigned] [usertype] mask
>> io_uring/io_uring.c:6981:40: sparse: sparse: incorrect type in argument 2 (different base types) @@ expected int mask @@ got restricted __poll_t [assigned] [usertype] mask @@
io_uring/io_uring.c:6981:40: sparse: expected int mask
io_uring/io_uring.c:6981:40: sparse: got restricted __poll_t [assigned] [usertype] mask
>> io_uring/io_uring.c:7016:33: sparse: sparse: incorrect type in initializer (different base types) @@ expected restricted __poll_t [usertype] mask @@ got int @@
io_uring/io_uring.c:7016:33: sparse: expected restricted __poll_t [usertype] mask
io_uring/io_uring.c:7016:33: sparse: got int
io_uring/io_uring.c:7064:33: sparse: sparse: incorrect type in argument 5 (different base types) @@ expected int mask @@ got restricted __poll_t [assigned] [usertype] mask @@
io_uring/io_uring.c:7064:33: sparse: expected int mask
io_uring/io_uring.c:7064:33: sparse: got restricted __poll_t [assigned] [usertype] mask
>> io_uring/io_uring.c:7064:50: sparse: sparse: incorrect type in argument 6 (different base types) @@ expected int events @@ got restricted __poll_t [usertype] events @@
io_uring/io_uring.c:7064:50: sparse: expected int events
io_uring/io_uring.c:7064:50: sparse: got restricted __poll_t [usertype] events
>> io_uring/io_uring.c:7178:24: sparse: sparse: invalid assignment: |=
>> io_uring/io_uring.c:7178:24: sparse: left side has type unsigned int
>> io_uring/io_uring.c:7178:24: sparse: right side has type restricted __poll_t
io_uring/io_uring.c:7179:65: sparse: sparse: restricted __poll_t degrades to integer
io_uring/io_uring.c:7179:29: sparse: sparse: restricted __poll_t degrades to integer
>> io_uring/io_uring.c:7179:38: sparse: sparse: incorrect type in return expression (different base types) @@ expected restricted __poll_t @@ got unsigned int @@
io_uring/io_uring.c:7179:38: sparse: expected restricted __poll_t
io_uring/io_uring.c:7179:38: sparse: got unsigned int
io_uring/io_uring.c:7266:43: sparse: sparse: invalid assignment: &=
>> io_uring/io_uring.c:7266:43: sparse: left side has type restricted __poll_t
>> io_uring/io_uring.c:7266:43: sparse: right side has type int
io_uring/io_uring.c:7267:62: sparse: sparse: restricted __poll_t degrades to integer
io_uring/io_uring.c:7267:43: sparse: sparse: invalid assignment: |=
io_uring/io_uring.c:7267:43: sparse: left side has type restricted __poll_t
>> io_uring/io_uring.c:7267:43: sparse: right side has type unsigned int
io_uring/io_uring.c:2676:17: sparse: sparse: context imbalance in 'handle_prev_tw_list' - different lock contexts for basic block
io_uring/io_uring.c:9284:9: sparse: sparse: context imbalance in 'io_sq_thread_unpark' - wrong count at exit
io_uring/io_uring.c:9295:9: sparse: sparse: context imbalance in 'io_sq_thread_park' - wrong count at exit

vim +6701 io_uring/io_uring.c

18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6667
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 6668 static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags);
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6669 /*
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6670 * All poll tw should go through this. Checks for poll events, manages
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6671 * references, does rewait, etc.
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6672 *
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6673 * Returns a negative error on failure. >0 when no action require, which is
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6674 * either spurious wakeup or multishot CQE is served. 0 when it's done with
cef216fc32d762 fs/io_uring.c Pavel Begunkov 2022-04-12 6675 * the request, then the mask is stored in req->cqe.res.
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6676 */
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 6677 static int io_poll_check_events(struct io_kiocb *req, bool *locked)
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6678 {
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6679 struct io_ring_ctx *ctx = req->ctx;
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 6680 int v, ret;
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6681
316319e82f7342 fs/io_uring.c Jens Axboe 2021-08-19 6682 /* req->task == current here, checking PF_EXITING is safe */
e09ee510600b94 fs/io_uring.c Pavel Begunkov 2021-07-01 6683 if (unlikely(req->task->flags & PF_EXITING))
f22190570b213d fs/io_uring.c Pavel Begunkov 2022-04-15 6684 return -ECANCELED;
e09ee510600b94 fs/io_uring.c Pavel Begunkov 2021-07-01 6685
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6686 do {
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6687 v = atomic_read(&req->poll_refs);
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6688
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6689 /* tw handler should be the owner, and so have some references */
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6690 if (WARN_ON_ONCE(!(v & IO_POLL_REF_MASK)))
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6691 return 0;
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6692 if (v & IO_POLL_CANCEL_FLAG)
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6693 return -ECANCELED;
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6694
cef216fc32d762 fs/io_uring.c Pavel Begunkov 2022-04-12 6695 if (!req->cqe.res) {
2804ecd8d3e373 fs/io_uring.c Jens Axboe 2022-04-11 6696 struct poll_table_struct pt = { ._key = req->apoll_events };
cce64ef01308b6 fs/io_uring.c Pavel Begunkov 2022-04-13 6697 unsigned flags = locked ? 0 : IO_URING_F_UNLOCKED;
74ce6ce43d4fc6 fs/io_uring.c Jens Axboe 2020-04-13 6698
cce64ef01308b6 fs/io_uring.c Pavel Begunkov 2022-04-13 6699 if (unlikely(!io_assign_file(req, flags)))
7179c3ce3dbff6 fs/io_uring.c Pavel Begunkov 2022-04-13 6700 return -EBADF;
cef216fc32d762 fs/io_uring.c Pavel Begunkov 2022-04-12 @6701 req->cqe.res = vfs_poll(req->file, &pt) & req->apoll_events;
e27414bef7b4f2 fs/io_uring.c Pavel Begunkov 2021-04-09 6702 }
74ce6ce43d4fc6 fs/io_uring.c Jens Axboe 2020-04-13 6703
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 6704 if ((unlikely(!req->cqe.res)))
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 6705 continue;
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 6706 if (req->apoll_events & EPOLLONESHOT)
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 6707 return 0;
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 6708
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 6709 /* multishot, just fill a CQE and proceed */
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 6710 if (!(req->flags & REQ_F_APOLL_MULTISHOT)) {
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 @6711 __poll_t mask = mangle_poll(req->cqe.res &
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 @6712 req->apoll_events);
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6713 bool filled;
74ce6ce43d4fc6 fs/io_uring.c Jens Axboe 2020-04-13 6714
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6715 spin_lock(&ctx->completion_lock);
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 6716 filled = io_fill_cqe_aux(ctx, req->cqe.user_data,
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 @6717 mask, IORING_CQE_F_MORE);
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6718 io_commit_cqring(ctx);
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6719 spin_unlock(&ctx->completion_lock);
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 6720 if (filled) {
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6721 io_cqring_ev_posted(ctx);
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 6722 continue;
a62682f92eedb4 fs/io_uring.c Hao Xu 2021-09-22 6723 }
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 6724 return -ECANCELED;
a62682f92eedb4 fs/io_uring.c Hao Xu 2021-09-22 6725 }
7b289c38335ec7 fs/io_uring.c Hao Xu 2021-04-13 6726
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 6727 io_tw_lock(req->ctx, locked);
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 6728 if (unlikely(req->task->flags & PF_EXITING))
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 6729 return -EFAULT;
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 6730 ret = io_issue_sqe(req,
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 6731 IO_URING_F_NONBLOCK|IO_URING_F_COMPLETE_DEFER);
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 6732 if (ret)
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 6733 return ret;
7b289c38335ec7 fs/io_uring.c Hao Xu 2021-04-13 6734
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6735 /*
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6736 * Release all references, retry if someone tried to restart
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6737 * task_work while we were executing it.
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6738 */
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6739 } while (atomic_sub_return(v & IO_POLL_REF_MASK, &req->poll_refs));
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6740
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6741 return 1;
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6742 }
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6743
f237c30a5610d3 fs/io_uring.c Pavel Begunkov 2021-08-18 6744 static void io_poll_task_func(struct io_kiocb *req, bool *locked)
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6745 {
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6746 struct io_ring_ctx *ctx = req->ctx;
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6747 int ret;
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6748
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 6749 ret = io_poll_check_events(req, locked);
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6750 if (ret > 0)
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6751 return;
88e41cf928a6e1 fs/io_uring.c Jens Axboe 2021-02-22 6752
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6753 if (!ret) {
cef216fc32d762 fs/io_uring.c Pavel Begunkov 2022-04-12 6754 req->cqe.res = mangle_poll(req->cqe.res & req->poll.events);
f40b964a66ace5 fs/io_uring.c Pavel Begunkov 2021-04-09 6755 } else {
cef216fc32d762 fs/io_uring.c Pavel Begunkov 2022-04-12 6756 req->cqe.res = ret;
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6757 req_set_fail(req);
88e41cf928a6e1 fs/io_uring.c Jens Axboe 2021-02-22 6758 }
913a571affedd1 fs/io_uring.c Pavel Begunkov 2021-11-10 6759
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6760 io_poll_remove_entries(req);
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6761 spin_lock(&ctx->completion_lock);
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6762 hash_del(&req->hash_node);
cef216fc32d762 fs/io_uring.c Pavel Begunkov 2022-04-12 6763 __io_req_complete_post(req, req->cqe.res, 0);
31efe48eb5dc4d fs/io_uring.c Xiaoguang Wang 2021-09-03 6764 io_commit_cqring(ctx);
79ebeaee8a21a0 fs/io_uring.c Jens Axboe 2021-08-10 6765 spin_unlock(&ctx->completion_lock);
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6766 io_cqring_ev_posted(ctx);
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6767 }
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6768
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6769 static void io_apoll_task_func(struct io_kiocb *req, bool *locked)
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6770 {
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6771 struct io_ring_ctx *ctx = req->ctx;
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6772 int ret;
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6773
dbc2564cfe0faf fs/io_uring.c Hao Xu 2022-05-14 6774 ret = io_poll_check_events(req, locked);
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6775 if (ret > 0)
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6776 return;
88e41cf928a6e1 fs/io_uring.c Jens Axboe 2021-02-22 6777
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6778 io_poll_remove_entries(req);
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6779 spin_lock(&ctx->completion_lock);
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6780 hash_del(&req->hash_node);
5b7aa38d86f348 fs/io_uring.c Hao Xu 2021-09-22 6781 spin_unlock(&ctx->completion_lock);
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6782
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6783 if (!ret)
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6784 io_req_task_submit(req, locked);
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6785 else
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6786 io_req_complete_failed(req, ret);
5b7aa38d86f348 fs/io_uring.c Hao Xu 2021-09-22 6787 }
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6788
58f5c8d39e0ea0 fs/io_uring.c Christoph Hellwig 2022-05-18 6789 static void __io_poll_execute(struct io_kiocb *req, int mask, __poll_t events)
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6790 {
cef216fc32d762 fs/io_uring.c Pavel Begunkov 2022-04-12 6791 req->cqe.res = mask;
81459350d581e9 fs/io_uring.c Jens Axboe 2022-03-16 6792 /*
81459350d581e9 fs/io_uring.c Jens Axboe 2022-03-16 6793 * This is useful for poll that is armed on behalf of another
81459350d581e9 fs/io_uring.c Jens Axboe 2022-03-16 6794 * request, and where the wakeup path could be on a different
81459350d581e9 fs/io_uring.c Jens Axboe 2022-03-16 6795 * CPU. We want to avoid pulling in req->apoll->events for that
81459350d581e9 fs/io_uring.c Jens Axboe 2022-03-16 6796 * case.
81459350d581e9 fs/io_uring.c Jens Axboe 2022-03-16 6797 */
2804ecd8d3e373 fs/io_uring.c Jens Axboe 2022-04-11 6798 req->apoll_events = events;
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6799 if (req->opcode == IORING_OP_POLL_ADD)
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6800 req->io_task_work.func = io_poll_task_func;
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6801 else
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6802 req->io_task_work.func = io_apoll_task_func;
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6803
cef216fc32d762 fs/io_uring.c Pavel Begunkov 2022-04-12 6804 trace_io_uring_task_add(req->ctx, req, req->cqe.user_data, req->opcode, mask);
3fe07bcd800d6e fs/io_uring.c Jens Axboe 2022-05-21 6805 io_req_task_work_add(req);
dd221f46f68ad9 fs/io_uring.c Pavel Begunkov 2020-10-18 6806 }
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6807
58f5c8d39e0ea0 fs/io_uring.c Christoph Hellwig 2022-05-18 6808 static inline void io_poll_execute(struct io_kiocb *req, int res,
58f5c8d39e0ea0 fs/io_uring.c Christoph Hellwig 2022-05-18 6809 __poll_t events)
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6810 {
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6811 if (io_poll_get_ownership(req))
81459350d581e9 fs/io_uring.c Jens Axboe 2022-03-16 6812 __io_poll_execute(req, res, events);
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6813 }
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6814
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6815 static void io_poll_cancel_req(struct io_kiocb *req)
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6816 {
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6817 io_poll_mark_cancelled(req);
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6818 /* kick tw, which should complete the request */
81459350d581e9 fs/io_uring.c Jens Axboe 2022-03-16 6819 io_poll_execute(req, 0, 0);
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6820 }
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6821
d89a4fac0fbc6f fs/io_uring.c Jens Axboe 2022-03-22 6822 #define wqe_to_req(wait) ((void *)((unsigned long) (wait)->private & ~1))
d89a4fac0fbc6f fs/io_uring.c Jens Axboe 2022-03-22 6823 #define wqe_is_double(wait) ((unsigned long) (wait)->private & 1)
a294bef57c55a4 fs/io_uring.c Christoph Hellwig 2022-05-18 6824 #define IO_ASYNC_POLL_COMMON (EPOLLONESHOT | EPOLLPRI)
d89a4fac0fbc6f fs/io_uring.c Jens Axboe 2022-03-22 6825
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6826 static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6827 void *key)
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6828 {
d89a4fac0fbc6f fs/io_uring.c Jens Axboe 2022-03-22 6829 struct io_kiocb *req = wqe_to_req(wait);
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6830 struct io_poll_iocb *poll = container_of(wait, struct io_poll_iocb,
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6831 wait);
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6832 __poll_t mask = key_to_poll(key);
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6833
791f3465c4afde fs/io_uring.c Pavel Begunkov 2022-01-14 6834 if (unlikely(mask & POLLFREE)) {
791f3465c4afde fs/io_uring.c Pavel Begunkov 2022-01-14 6835 io_poll_mark_cancelled(req);
791f3465c4afde fs/io_uring.c Pavel Begunkov 2022-01-14 6836 /* we have to kick tw in case it's not already */
81459350d581e9 fs/io_uring.c Jens Axboe 2022-03-16 6837 io_poll_execute(req, 0, poll->events);
791f3465c4afde fs/io_uring.c Pavel Begunkov 2022-01-14 6838
791f3465c4afde fs/io_uring.c Pavel Begunkov 2022-01-14 6839 /*
791f3465c4afde fs/io_uring.c Pavel Begunkov 2022-01-14 6840 * If the waitqueue is being freed early but someone is already
791f3465c4afde fs/io_uring.c Pavel Begunkov 2022-01-14 6841 * holds ownership over it, we have to tear down the request as
791f3465c4afde fs/io_uring.c Pavel Begunkov 2022-01-14 6842 * best we can. That means immediately removing the request from
791f3465c4afde fs/io_uring.c Pavel Begunkov 2022-01-14 6843 * its waitqueue and preventing all further accesses to the
791f3465c4afde fs/io_uring.c Pavel Begunkov 2022-01-14 6844 * waitqueue via the request.
791f3465c4afde fs/io_uring.c Pavel Begunkov 2022-01-14 6845 */
791f3465c4afde fs/io_uring.c Pavel Begunkov 2022-01-14 6846 list_del_init(&poll->wait.entry);
791f3465c4afde fs/io_uring.c Pavel Begunkov 2022-01-14 6847
791f3465c4afde fs/io_uring.c Pavel Begunkov 2022-01-14 6848 /*
791f3465c4afde fs/io_uring.c Pavel Begunkov 2022-01-14 6849 * Careful: this *must* be the last step, since as soon
791f3465c4afde fs/io_uring.c Pavel Begunkov 2022-01-14 6850 * as req->head is NULL'ed out, the request can be
791f3465c4afde fs/io_uring.c Pavel Begunkov 2022-01-14 6851 * completed and freed, since aio_poll_complete_work()
791f3465c4afde fs/io_uring.c Pavel Begunkov 2022-01-14 6852 * will no longer need to take the waitqueue lock.
791f3465c4afde fs/io_uring.c Pavel Begunkov 2022-01-14 6853 */
791f3465c4afde fs/io_uring.c Pavel Begunkov 2022-01-14 6854 smp_store_release(&poll->head, NULL);
791f3465c4afde fs/io_uring.c Pavel Begunkov 2022-01-14 6855 return 1;
791f3465c4afde fs/io_uring.c Pavel Begunkov 2022-01-14 6856 }
791f3465c4afde fs/io_uring.c Pavel Begunkov 2022-01-14 6857
aa43477b040251 fs/io_uring.c Pavel Begunkov 2021-12-15 6858 /* for instances that support it check for an event match first */
1b1d7b4bf1d994 fs/io_uring.c Dylan Yudaken 2022-05-12 6859 if (mask && !(mask & (poll->events & ~IO_ASYNC_POLL_COMMON)))
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6860 return 0;
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6861
eb0089d629ba41 fs/io_uring.c Pavel Begunkov 2021-12-15 6862 if (io_poll_get_ownership(req)) {
eb0089d629ba41 fs/io_uring.c Pavel Begunkov 2021-12-15 6863 /* optional, saves extra locking for removal in tw handler */
eb0089d629ba41 fs/io_uring.c Pavel Begunkov 2021-12-15 6864 if (mask && poll->events & EPOLLONESHOT) {
807abcb0883439 fs/io_uring.c Jens Axboe 2020-07-17 6865 list_del_init(&poll->wait.entry);
eb0089d629ba41 fs/io_uring.c Pavel Begunkov 2021-12-15 6866 poll->head = NULL;
d89a4fac0fbc6f fs/io_uring.c Jens Axboe 2022-03-22 6867 if (wqe_is_double(wait))
d89a4fac0fbc6f fs/io_uring.c Jens Axboe 2022-03-22 6868 req->flags &= ~REQ_F_DOUBLE_POLL;
d89a4fac0fbc6f fs/io_uring.c Jens Axboe 2022-03-22 6869 else
91eac1c69c202d fs/io_uring.c Jens Axboe 2022-03-16 6870 req->flags &= ~REQ_F_SINGLE_POLL;
c8b5e2600a2cfa fs/io_uring.c Jens Axboe 2020-10-25 6871 }
81459350d581e9 fs/io_uring.c Jens Axboe 2022-03-16 @6872 __io_poll_execute(req, mask, poll->events);
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6873 }
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6874 return 1;
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6875 }
18bceab101adde fs/io_uring.c Jens Axboe 2020-05-15 6876

:::::: The code at line 6701 was first introduced by commit
:::::: cef216fc32d7628206c523994e7e267e7a8dda59 io_uring: explicitly keep a CQE in io_kiocb

:::::: TO: Pavel Begunkov <asml.silence@xxxxxxxxx>
:::::: CC: Jens Axboe <axboe@xxxxxxxxx>

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