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| author | Jens Axboe <axboe@kernel.dk> | 2023-01-24 18:24:25 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-10 11:34:03 +0300 |
| commit | 4c13c6a080ec7b9b9062a6d07e47b7e539c7ff59 (patch) | |
| tree | 1107b5a30be8b13e52b050ee9e283c2c26bf5c10 /io_uring | |
| parent | c981a035dff031925855c0195e66e157d3ea1e76 (diff) | |
| download | linux-4c13c6a080ec7b9b9062a6d07e47b7e539c7ff59.tar.xz | |
io_uring: handle TIF_NOTIFY_RESUME when checking for task_work
commit b5d3ae202fbfe055aa2a8ae8524531ee1dcab717 upstream.
If TIF_NOTIFY_RESUME is set, then we need to call resume_user_mode_work()
for PF_IO_WORKER threads. They never return to usermode, hence never get
a chance to process any items that are marked by this flag. Most notably
this includes the final put of files, but also any throttling markers set
by block cgroups.
Cc: stable@vger.kernel.org # 5.10+
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'io_uring')
| -rw-r--r-- | io_uring/io_uring.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/io_uring/io_uring.h b/io_uring/io_uring.h index 90b675c65b84..3bacbfefc0e1 100644 --- a/io_uring/io_uring.h +++ b/io_uring/io_uring.h @@ -3,6 +3,7 @@ #include <linux/errno.h> #include <linux/lockdep.h> +#include <linux/resume_user_mode.h> #include <linux/io_uring_types.h> #include <uapi/linux/eventpoll.h> #include "io-wq.h" @@ -255,6 +256,13 @@ static inline int io_run_task_work(void) */ if (test_thread_flag(TIF_NOTIFY_SIGNAL)) clear_notify_signal(); + /* + * PF_IO_WORKER never returns to userspace, so check here if we have + * notify work that needs processing. + */ + if (current->flags & PF_IO_WORKER && + test_thread_flag(TIF_NOTIFY_RESUME)) + resume_user_mode_work(NULL); if (task_work_pending(current)) { __set_current_state(TASK_RUNNING); task_work_run(); |