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authorGui Jianfeng <guijianfeng@cn.fujitsu.com>2010-02-26 02:56:15 -0500
committerJens Axboe <jens.axboe@oracle.com>2010-02-26 02:56:15 -0500
commit024f9066165ffe9c8284431c78adcbcddd309831 (patch)
tree11b64dd7861985aca57bd7624cd25c804afd4b1a /block/blk-cgroup.c
parent7f03292ee16e68be96aa88904afc6152f8d37736 (diff)
cfq: Remove useless css reference get
There's no need to take css reference here, for the caller has already called rcu_read_lock() to prevent cgroup from being removed. Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com> Reviewed-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/blk-cgroup.c')
-rw-r--r--block/blk-cgroup.c14
1 files changed, 0 insertions, 14 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index e7dbbaf5fb3e..c85d74cae200 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -23,20 +23,6 @@ static LIST_HEAD(blkio_list);
23struct blkio_cgroup blkio_root_cgroup = { .weight = 2*BLKIO_WEIGHT_DEFAULT }; 23struct blkio_cgroup blkio_root_cgroup = { .weight = 2*BLKIO_WEIGHT_DEFAULT };
24EXPORT_SYMBOL_GPL(blkio_root_cgroup); 24EXPORT_SYMBOL_GPL(blkio_root_cgroup);
25 25
26bool blkiocg_css_tryget(struct blkio_cgroup *blkcg)
27{
28 if (!css_tryget(&blkcg->css))
29 return false;
30 return true;
31}
32EXPORT_SYMBOL_GPL(blkiocg_css_tryget);
33
34void blkiocg_css_put(struct blkio_cgroup *blkcg)
35{
36 css_put(&blkcg->css);
37}
38EXPORT_SYMBOL_GPL(blkiocg_css_put);
39
40struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup) 26struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup)
41{ 27{
42 return container_of(cgroup_subsys_state(cgroup, blkio_subsys_id), 28 return container_of(cgroup_subsys_state(cgroup, blkio_subsys_id),