[PATCH 3.16 066/306] blkcg: Annotate blkg_hint correctly

[Ben Hutchings]

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

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

From: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>

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@xxxxxxxxxxx>
Acked-by: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxx>
[bwh: Backported to 3.16: adjust filename]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 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 */