From: Chaitanya Kulkarni <kch@xxxxxxxxxx> Export the get_max_segment_size() so driver can do use that to create DMA mapping when it receives the request. Signed-off-by: Chaitanya Kulkarni <kch@xxxxxxxxxx> Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxx> --- block/blk-merge.c | 3 ++- include/linux/blk-mq.h | 3 +++ 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/block/blk-merge.c b/block/blk-merge.c index 8534c35e0497..0561e728ef95 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -190,7 +190,7 @@ static inline unsigned get_max_io_size(struct bio *bio, * * Returns the maximum number of bytes that can be added as a single segment. */ -static inline unsigned get_max_segment_size(const struct queue_limits *lim, +inline unsigned get_max_segment_size(const struct queue_limits *lim, struct page *start_page, unsigned long offset) { unsigned long mask = lim->seg_boundary_mask; @@ -203,6 +203,7 @@ static inline unsigned get_max_segment_size(const struct queue_limits *lim, */ return min(mask - offset, (unsigned long)lim->max_segment_size - 1) + 1; } +EXPORT_SYMBOL_GPL(get_max_segment_size); /** * bvec_split_segs - verify whether or not a bvec should be split in the middle diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 89ba6b16fe8b..008c77c9b518 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -1150,4 +1150,7 @@ static inline int blk_rq_map_sg(struct request_queue *q, struct request *rq, } void blk_dump_rq_flags(struct request *, char *); +unsigned get_max_segment_size(const struct queue_limits *lim, + struct page *start_page, unsigned long offset); + #endif /* BLK_MQ_H */ -- 2.45.2