--- zzzz-none-000/linux-4.19.183/include/linux/wait.h	2021-03-24 10:07:39.000000000 +0000
+++ bcm63-7530ax-756/linux-4.19.183/include/linux/wait.h	2023-06-28 08:54:20.000000000 +0000
@@ -1105,6 +1105,18 @@
 })
 
 /*
+ * These are the old interfaces to sleep waiting for an event.
+ * They are racy.  DO NOT use them, use the wait_event* interfaces above.
+ * We plan to remove these interfaces.
+ */
+extern void sleep_on(wait_queue_head_t *q);
+extern long sleep_on_timeout(wait_queue_head_t *q,
+				      signed long timeout);
+extern void interruptible_sleep_on(wait_queue_head_t *q);
+extern long interruptible_sleep_on_timeout(wait_queue_head_t *q,
+					   signed long timeout);
+
+/*
  * Waitqueues which are removed from the waitqueue_head at wakeup time
  */
 void prepare_to_wait(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry, int state);