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cgroup: replace cgroup_subsys->disabled tests with cgroup_subsys_enabled()

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Replace cgroup_subsys->disabled tests in controllers with
cgroup_subsys_enabled().  cgroup_subsys_enabled() requires literal
subsys name as its parameter and thus can't be used for cgroup core
which iterates through controllers.  For cgroup core, introduce and
use cgroup_ssid_enabled() which uses slower static_key_enabled() test
and can be indexed by subsys ID.

This leaves cgroup_subsys->disabled unused.  Removed.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Zefan Li <lizefan@huawei.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
This commit is contained in:
Tejun Heo 2015-09-18 11:56:28 -04:00
parent 49d1dc4b81
commit fc5ed1e954
4 changed files with 23 additions and 14 deletions
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4
include/linux/hugetlb_cgroup.h
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@ -48,9 +48,7 @@ int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
static inline bool hugetlb_cgroup_disabled(void)
{
if (hugetlb_cgrp_subsys.disabled)
return true;
return false;
return !cgroup_subsys_enabled(hugetlb_cgrp_subsys);
}
extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,