On Mon, Aug 17, 2020 at 12:09:19PM +0800, Baolin Wang wrote:

The blk_mq_sched_bio_merge() just wrap the __blk_mq_sched_bio_merge(), and
no other places will use __blk_mq_sched_bio_merge(). Thus we can combine
these 2 similar functions into one function.

I think the idea was to avoid the function call for the nomerges fast
path.  Not sure if that is really worth it.