cgroup: rename cgroup_subsys->base_cftypes to ->legacy_cftypes

Currently, cgroup_subsys->base_cftypes is 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 arrays 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 renames cgroup_subsys->base_cftypes to
cgroup_subsys->legacy_cftypes.  This patch is pure rename.

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: Vivek Goyal <vgoyal@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Aristeu Rozanski <aris@redhat.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 7e5fee5d6422..6496a83b0314 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -4890,7 +4890,7 @@ int __init cgroup_init(void)
                  */
                 if (!ss->disabled) {
                         cgrp_dfl_root.subsys_mask |= 1 << ss->id;
-                        WARN_ON(cgroup_add_cftypes(ss, ss->base_cftypes));
+                        WARN_ON(cgroup_add_cftypes(ss, ss->legacy_cftypes));
                 }
         }
 
@@ -5480,6 +5480,6 @@ static struct cftype debug_files[] =  {
 struct cgroup_subsys debug_cgrp_subsys = {
         .css_alloc = debug_css_alloc,
         .css_free = debug_css_free,
-        .base_cftypes = debug_files,
+        .legacy_cftypes = debug_files,
 };
 #endif /* CONFIG_CGROUP_DEBUG */