}
  EXPORT_SYMBOL_GPL(blk_queue_write_cache);
  
--/**
-  * blk_queue_can_use_dma_map_merging - configure queue for merging segments.
-  * @q:                the request queue for the device
-  * @dev:      the device pointer for dma
 - * blk_queue_required_elevator_features - Set a queue required elevator features
 - * @q:                the request queue for the target device
 - * @features: Required elevator features OR'ed together
-- *
-  * Tell the block layer about merging the segments by dma map of @q.
 - * Tell the block layer that for the device controlled through @q, only the
 - * only elevators that can be used are those that implement at least the set of
 - * features specified by @features.
-- */
- bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
-                                      struct device *dev)
 -void blk_queue_required_elevator_features(struct request_queue *q,
 -                                        unsigned int features)
--{
-       unsigned long boundary = dma_get_merge_boundary(dev);
- 
-       if (!boundary)
-               return false;
- 
-       /* No need to update max_segment_size. see blk_queue_virt_boundary() */
-       blk_queue_virt_boundary(q, boundary);
- 
-       return true;
 -      q->required_elevator_features = features;
--}
- EXPORT_SYMBOL_GPL(blk_queue_can_use_dma_map_merging);
 -EXPORT_SYMBOL_GPL(blk_queue_required_elevator_features);
--
  /**
   * disk_set_zoned - inidicate a zoned device
   * @disk:     gendisk to configure
 
  void disk_set_independent_access_ranges(struct gendisk *disk,
                                struct blk_independent_access_ranges *iars);
  
- extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
-                                             struct device *dev);
 -/*
 - * Elevator features for blk_queue_required_elevator_features:
 - */
 -/* Supports zoned block devices sequential write constraint */
 -#define ELEVATOR_F_ZBD_SEQ_WRITE      (1U << 0)
 -
 -extern void blk_queue_required_elevator_features(struct request_queue *q,
 -                                               unsigned int features);
--
  bool __must_check blk_get_queue(struct request_queue *);
  extern void blk_put_queue(struct request_queue *);