path: root/block/blk-throttle.c
diff options
authorTejun Heo <>2015-09-18 11:56:28 -0400
committerTejun Heo <>2015-09-18 11:56:28 -0400
commit9e10a130d9b62af976d17d120c95f3650769312c (patch)
tree2a580955a56434f6e7c455a8f0ebf6eec71a9194 /block/blk-throttle.c
parentfc5ed1e95410ad73b2ab8f33cd90eb3bcf6c98a1 (diff)
cgroup: replace cgroup_on_dfl() tests in controllers with cgroup_subsys_on_dfl()
cgroup_on_dfl() tests whether the cgroup's root is the default hierarchy; however, an individual controller is only interested in whether the controller is attached to the default hierarchy and never tests a cgroup which doesn't belong to the hierarchy that the controller is attached to. This patch replaces cgroup_on_dfl() tests in controllers with faster static_key based cgroup_subsys_on_dfl(). This leaves cgroup core as the only user of cgroup_on_dfl() and the function is moved from the header file to cgroup.c. Signed-off-by: Tejun Heo <> Acked-by: Zefan Li <> Cc: Vivek Goyal <> Cc: Jens Axboe <> Cc: Johannes Weiner <> Cc: Michal Hocko <>
Diffstat (limited to 'block/blk-throttle.c')
1 files changed, 1 insertions, 1 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index c75a263..2149a1d 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -369,7 +369,7 @@ static void throtl_pd_init(struct blkg_policy_data *pd)
* regardless of the position of the group in the hierarchy.
sq->parent_sq = &td->service_queue;
- if (cgroup_on_dfl(blkg->blkcg->css.cgroup) && blkg->parent)
+ if (cgroup_subsys_on_dfl(io_cgrp_subsys) && blkg->parent)
sq->parent_sq = &blkg_to_tg(blkg->parent)->service_queue;
tg->td = td;