[PATCH v2 04/51] mm: page_io.c: comment on direct access to bvec table

Ming Lei
2017-06-26T12:12:39Z

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
mm/page_io.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/mm/page_io.c b/mm/page_io.c
index b6c4ac388209..11c6f4a9a25b 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_status) {
@@ -116,6 +117,7 @@ static void swap_slot_free_notify(struct page *page)

static void end_swap_bio_read(struct bio *bio)
{
+ /* single page bio, safe for multipage bvec */
struct page *page = bio->bi_io_vec[0].bv_page;
struct task_struct *waiter = bio->bi_private;

--
2.9.4