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[v1,04/54] mm: page_io.c: comment on direct access to bvec table

Message ID 1482854250-13481-5-git-send-email-tom.leiming@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Ming Lei Dec. 27, 2016, 3:55 p.m. UTC
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
---
 mm/page_io.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/mm/page_io.c b/mm/page_io.c
index 23f6d0d3470f..368a16aa810c 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) {
@@ -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;
 
 	if (bio->bi_error) {