147 struct cgroup_subsys_state *css_next_child(struct cgroup_subsys_state *pos,
149 struct cgroup_subsys_state *css_next_descendant_pre(struct cgroup_subsys_state *pos,
151 struct cgroup_subsys_state *css_rightmost_descendant(struct cgroup_subsys_state *pos);
152 struct cgroup_subsys_state *css_next_descendant_post(struct cgroup_subsys_state *pos,
183 #define css_for_each_child(pos, parent)					\  argument
184 	for ((pos) = css_next_child(NULL, (parent)); (pos);		\
185 	     (pos) = css_next_child((pos), (parent)))
243 #define css_for_each_descendant_pre(pos, css)				\  argument
244 	for ((pos) = css_next_descendant_pre(NULL, (css)); (pos);	\
245 	     (pos) = css_next_descendant_pre((pos), (css)))
266 #define css_for_each_descendant_post(pos, css)				\  argument
267 	for ((pos) = css_next_descendant_post(NULL, (css)); (pos);	\
268 	     (pos) = css_next_descendant_post((pos), (css)))