[PATCH 6.8 210/273] io_uring: use private workqueue for exit work

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6.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jens Axboe <axboe@xxxxxxxxx>

commit 73eaa2b583493b680c6f426531d6736c39643bfb upstream.

Rather than use the system unbound event workqueue, use an io_uring
specific one. This avoids dependencies with the tty, which also uses
the system_unbound_wq, and issues flushes of said workqueue from inside
its poll handling.

Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Rasmus Karlsson <rasmus.karlsson@xxxxxxxxxxx>
Tested-by: Rasmus Karlsson <rasmus.karlsson@xxxxxxxxxxx>
Tested-by: Iskren Chernev <me@xxxxxxxxxxx>
Link: https://github.com/axboe/liburing/issues/1113
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 io_uring/io_uring.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -152,6 +152,7 @@ static bool io_uring_try_cancel_requests
 static void io_queue_sqe(struct io_kiocb *req);
 
 struct kmem_cache *req_cachep;
+static struct workqueue_struct *iou_wq __ro_after_init;
 
 static int __read_mostly sysctl_io_uring_disabled;
 static int __read_mostly sysctl_io_uring_group = -1;
@@ -3139,7 +3140,7 @@ static __cold void io_ring_ctx_wait_and_
 	 * noise and overhead, there's no discernable change in runtime
 	 * over using system_wq.
 	 */
-	queue_work(system_unbound_wq, &ctx->exit_work);
+	queue_work(iou_wq, &ctx->exit_work);
 }
 
 static int io_uring_release(struct inode *inode, struct file *file)
@@ -4164,6 +4165,8 @@ static int __init io_uring_init(void)
 					  SLAB_HWCACHE_ALIGN | SLAB_PANIC | SLAB_ACCOUNT,
 					  NULL);
 
+	iou_wq = alloc_workqueue("iou_exit", WQ_UNBOUND, 64);
+
 #ifdef CONFIG_SYSCTL
 	register_sysctl_init("kernel", kernel_io_uring_disabled_table);
 #endif






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