# \[PATCH v1 03/54\] kernel/power/swap.c: comment on direct access to bvec table

- From: Ming Lei \<tom.leiming@gmail.com\>
- Date: 2016-12-27 16:07:30 
- List: linux-block
- Page: https://ratatoskr.run/linux-block/2016/12/4900972
- Thread: https://ratatoskr.run/linux-block/2016/12/4900972/t.md

```text
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
---
 kernel/power/swap.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index 32e0c232efba..031e709c9fc4 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -238,6 +238,8 @@ static void hib_init_batch(struct hib_bio_batch *hb)
 static void hib_end_io(struct bio *bio)
 {
 	struct hib_bio_batch *hb = bio->bi_private;
+
+	/* single page bio, safe for multipage bvec */
 	struct page *page = bio->bi_io_vec[0].bv_page;
 
 	if (bio->bi_error) {
-- 
2.7.4

```