--- zzzz-none-000/linux-4.4.60/include/linux/blkdev.h	2017-04-08 07:53:53.000000000 +0000
+++ jet-2400-727/linux-4.4.60/include/linux/blkdev.h	2021-03-17 14:36:41.000000000 +0000
@@ -796,6 +796,7 @@
 
 extern int blk_queue_enter(struct request_queue *q, gfp_t gfp);
 extern void blk_queue_exit(struct request_queue *q);
+extern void blk_recalc_rq_segments(struct request *rq);
 extern void blk_start_queue(struct request_queue *q);
 extern void blk_start_queue_async(struct request_queue *q);
 extern void blk_stop_queue(struct request_queue *q);