--- zzzz-none-000/linux-4.4.60/block/blk.h	2017-04-08 07:53:53.000000000 +0000
+++ scorpion-1750e-727/linux-4.4.60/block/blk.h	2021-02-04 17:41:59.000000000 +0000
@@ -214,7 +214,6 @@
 int attempt_front_merge(struct request_queue *q, struct request *rq);
 int blk_attempt_req_merge(struct request_queue *q, struct request *rq,
 				struct request *next);
-void blk_recalc_rq_segments(struct request *rq);
 void blk_rq_set_mixed_merge(struct request *rq);
 bool blk_rq_merge_ok(struct request *rq, struct bio *bio);
 int blk_try_merge(struct request *rq, struct bio *bio);