linux-kernel - [PATCH 3.16 066/306] blkcg: Annotate blkg

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Message-ID: <lsq.1487198500.712487670@decadent.org.uk>
Date:   Wed, 15 Feb 2017 22:41:40 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Jens Axboe" <axboe@...com>,
        "Bart Van Assche" <bart.vanassche@...disk.com>,
        "Tejun Heo" <tj@...nel.org>
Subject: [PATCH 3.16 066/306] blkcg: Annotate blkg_hint correctly

3.16.40-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Bart Van Assche <bart.vanassche@...disk.com>

commit 55679c8d23d191c24ad133abc5647e3054ca8de1 upstream.

Avoid that sparse complains about blkg_hint manipulations.

Fixes: a637120e4902 ("blkcg: use radix tree to index blkgs from blkcg")
Signed-off-by: Bart Van Assche <bart.vanassche@...disk.com>
Acked-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Jens Axboe <axboe@...com>
[bwh: Backported to 3.16: adjust filename]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 block/blk-cgroup.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -47,7 +47,7 @@ struct blkcg {
 	spinlock_t			lock;
 
 	struct radix_tree_root		blkg_tree;
-	struct blkcg_gq			*blkg_hint;
+	struct blkcg_gq	__rcu		*blkg_hint;
 	struct hlist_head		blkg_list;
 
 	/* for policies to test whether associated blkcg has changed */