[PATCH 18/60] mm: page_io.c: comment on direct access to bvec table

[Ming Lei]

Signed-off-by: Ming Lei <tom.leim...@gmail.com>
---
 mm/page_io.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/page_io.c b/mm/page_io.c
index a2651f58c86a..b0c0069ec1f4 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -43,6 +43,7 @@ static struct bio *get_swap_bio(gfp_t gfp_flags,
 
 void end_swap_bio_write(struct bio *bio)
 {
+       /* single page bio, safe for multipage bvec */
        struct page *page = bio->bi_io_vec[0].bv_page;
 
        if (bio->bi_error) {
-- 
2.7.4