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authorTejun Heo <tj@kernel.org>2014-07-15 11:05:10 -0400
committerTejun Heo <tj@kernel.org>2014-07-15 11:05:10 -0400
commit5de4fa13c4df302db41e80ca679df24fdad0d661 (patch)
treebe42d0a743175431ee8dc6e5e43df99395163f98 /kernel/cgroup.c
parent05ebb6e60f044a9cef2549b6204559276500f363 (diff)
cgroup: initialize cgrp_dfl_root_inhibit_ss_mask from !->dfl_files test
cgrp_dfl_root_inhibit_ss_mask determines which subsystems are not supported on the default hierarchy and is currently initialized statically and just includes the debug subsystem. Now that there's cgroup_subsys->dfl_files, we can easily tell which subsystems support the default hierarchy or not. Let's initialize cgrp_dfl_root_inhibit_ss_mask by testing whether cgroup_subsys->dfl_files is NULL. After all, subsystems with NULL ->dfl_files aren't useable on the default hierarchy anyway. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Li Zefan <lizefan@huawei.com>
Diffstat (limited to 'kernel/cgroup.c')
-rw-r--r--kernel/cgroup.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index f41d164a3d54..f2a6795e695b 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -156,11 +156,7 @@ static bool cgrp_dfl_root_visible;
static bool cgroup_legacy_files_on_dfl;
/* some controllers are not supported in the default hierarchy */
-static const unsigned int cgrp_dfl_root_inhibit_ss_mask = 0
-#ifdef CONFIG_CGROUP_DEBUG
- | (1 << debug_cgrp_id)
-#endif
- ;
+static unsigned int cgrp_dfl_root_inhibit_ss_mask;
/* The list of hierarchy roots */
@@ -4939,6 +4935,9 @@ int __init cgroup_init(void)
if (cgroup_legacy_files_on_dfl && !ss->dfl_cftypes)
ss->dfl_cftypes = ss->legacy_cftypes;
+ if (!ss->dfl_cftypes)
+ cgrp_dfl_root_inhibit_ss_mask |= 1 << ss->id;
+
if (ss->dfl_cftypes == ss->legacy_cftypes) {
WARN_ON(cgroup_add_cftypes(ss, ss->dfl_cftypes));
} else {