linux-kernel - [PATCH] writeback: use rb

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Message-Id: <671275de093d93ddc7c6f77ddc0d357149691a39.1484306840.git.geliangtang@gmail.com>
Date:   Fri, 13 Jan 2017 23:17:12 +0800
From:   Geliang Tang <geliangtang@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>, Jens Axboe <axboe@...com>,
        Tejun Heo <tj@...nel.org>, Johannes Weiner <hannes@...xchg.org>
Cc:     Geliang Tang <geliangtang@...il.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] writeback: use rb_entry()

To make the code clearer, use rb_entry() instead of container_of() to
deal with rbtree.

Signed-off-by: Geliang Tang <geliangtang@...il.com>
---
 mm/backing-dev.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 3bfed5ab..ffb77a1 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -410,8 +410,8 @@ wb_congested_get_create(struct backing_dev_info *bdi, int blkcg_id, gfp_t gfp)
 
 	while (*node != NULL) {
 		parent = *node;
-		congested = container_of(parent, struct bdi_writeback_congested,
-					 rb_node);
+		congested = rb_entry(parent, struct bdi_writeback_congested,
+				     rb_node);
 		if (congested->blkcg_id < blkcg_id)
 			node = &parent->rb_left;
 		else if (congested->blkcg_id > blkcg_id)
-- 
2.9.3