1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index c90eaa803440..68e8df70487e 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -496,6 +496,21 @@ 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;