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

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Message-Id: <1477728600-12938-19-git-send-email-tom.leiming@gmail.com>
Date:   Sat, 29 Oct 2016 16:08:17 +0800
From:   Ming Lei <tom.leiming@...il.com>
To:     Jens Axboe <axboe@...com>, linux-kernel@...r.kernel.org
Cc:     linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Christoph Hellwig <hch@...radead.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Ming Lei <tom.leiming@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Minchan Kim <minchan@...nel.org>,
        Mike Christie <mchristi@...hat.com>,
        Santosh Shilimkar <santosh.shilimkar@...cle.com>,
        Joe Perches <joe@...ches.com>,
        linux-mm@...ck.org (open list:MEMORY MANAGEMENT)
Subject: [PATCH 18/60] mm: page_io.c: comment on direct access to bvec table

Signed-off-by: Ming Lei <tom.leiming@...il.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