cgroup_free_root  218 kernel/cgroup/cgroup-internal.h void cgroup_free_root(struct cgroup_root *root);
cgroup_free_root 1198 kernel/cgroup/cgroup-v1.c 		cgroup_free_root(root);
cgroup_free_root 1357 kernel/cgroup/cgroup.c 	cgroup_free_root(root);