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authorTejun Heo <tj@kernel.org>2014-07-15 11:05:09 -0400
committerTejun Heo <tj@kernel.org>2014-07-15 11:05:09 -0400
commit2cf669a58dc08fa065a8bd0dca866c0e6cb358cc (patch)
tree2a04b009299fb4262791fb46e08f5623ab471e70 /block
parent5577964e64692e17cc498854b7e0833e6532cd64 (diff)
downloadop-kernel-dev-2cf669a58dc08fa065a8bd0dca866c0e6cb358cc.zip
op-kernel-dev-2cf669a58dc08fa065a8bd0dca866c0e6cb358cc.tar.gz
cgroup: replace cgroup_add_cftypes() with cgroup_add_legacy_cftypes()
Currently, cftypes added by cgroup_add_cftypes() are used for both the unified default hierarchy and legacy ones and subsystems can mark each file with either CFTYPE_ONLY_ON_DFL or CFTYPE_INSANE if it has to appear only on one of them. This is quite hairy and error-prone. Also, we may end up exposing interface files to the default hierarchy without thinking it through. cgroup_subsys will grow two separate cftype addition functions and apply each only on the hierarchies of the matching type. This will allow organizing cftypes in a lot clearer way and encourage subsystems to scrutinize the interface which is being exposed in the new default hierarchy. In preparation, this patch adds cgroup_add_legacy_cftypes() which currently is a simple wrapper around cgroup_add_cftypes() and replaces all cgroup_add_cftypes() usages with it. While at it, this patch drops a completely spurious return from __hugetlb_cgroup_file_init(). This patch doesn't introduce any functional differences. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Neil Horman <nhorman@tuxdriver.com> Acked-by: Li Zefan <lizefan@huawei.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Diffstat (limited to 'block')
-rw-r--r--block/blk-cgroup.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 5cfbc72..2541cf0 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1124,7 +1124,8 @@ int __init blkcg_policy_register(struct blkcg_policy *pol)
/* everything is in place, add intf files for the new policy */
if (pol->cftypes)
- WARN_ON(cgroup_add_cftypes(&blkio_cgrp_subsys, pol->cftypes));
+ WARN_ON(cgroup_add_legacy_cftypes(&blkio_cgrp_subsys,
+ pol->cftypes));
ret = 0;
out_unlock:
mutex_unlock(&blkcg_pol_mutex);
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