To avoid duplicate code in rnbd-srv, we need to reexport
bio_map_kern.

This reverts commit 00ec4f3039a9e36cbccd1aea82d06c77c440a51c.

Suggested-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
---
 block/bio.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/block/bio.c b/block/bio.c
index 94d697217887..9190d68adad7 100644
--- a/block/bio.c
+++ b/block/bio.c

@@ -1564,6 +1564,7 @@ struct bio *bio_map_kern(struct request_queue *q, void *data, unsigned int len,
 	bio->bi_end_io = bio_map_kern_endio;
 	return bio;
 }
+EXPORT_SYMBOL(bio_map_kern);