1 files changed, 15 insertions, 0 deletions

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index df354ae079c1..f8a030ced0c7 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -499,6 +499,21 @@ struct cgroup_subsys {
          */
         bool __DEPRECATED_clear_css_refs;
 
+        /*
+         * If %false, this subsystem is properly hierarchical -
+         * configuration, resource accounting and restriction on a parent
+         * cgroup cover those of its children.  If %true, hierarchy support
+         * is broken in some ways - some subsystems ignore hierarchy
+         * completely while others are only implemented half-way.
+         *
+         * It's now disallowed to create nested cgroups if the subsystem is
+         * broken and cgroup core will emit a warning message on such
+         * cases.  Eventually, all subsystems will be made properly
+         * hierarchical and this will go away.
+         */
+        bool broken_hierarchy;
+        bool warned_broken_hierarchy;
+
 #define MAX_CGROUP_TYPE_NAMELEN 32
         const char *name;