io_uring: add IO_URING_EXIT_WAIT_MAX definition

Add the timeout we normally wait before complaining about things being
stuck waiting for cancelations to complete as a define, and use it in
io_ring_exit_work().

Signed-off-by: Jens Axboe <axboe@kernel.dk>

io_uring/io_uring.c

@@ -2962,7 +2962,7 @@ static __cold void io_tctx_exit_cb(struct callback_head *cb)
 static __cold void io_ring_exit_work(struct work_struct *work)
 {
 	struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, exit_work);
-	unsigned long timeout = jiffies + HZ * 60 * 5;
+	unsigned long timeout = jiffies + IO_URING_EXIT_WAIT_MAX;
 	unsigned long interval = HZ / 20;
 	struct io_tctx_exit exit;
 	struct io_tctx_node *node;

io_uring/io_uring.h

@@ -88,6 +88,12 @@ struct io_ctx_config {
 			IOSQE_BUFFER_SELECT |\
 			IOSQE_CQE_SKIP_SUCCESS)
 
+/*
+ * Complaint timeout for io_uring cancelation exits, and for io-wq exit
+ * worker waiting.
+ */
+#define IO_URING_EXIT_WAIT_MAX	(HZ * 60 * 5)
+
 enum {
 	IOU_COMPLETE		= 0,