cgroups: remove is_crucial_cgroup_subsystem()

src/lxc/cgroups/cgroup.c

@@ -108,33 +108,3 @@ void prune_init_scope(char *cg)
 			*point = '\0';
 	}
 }
-
-/* Return true if this is a subsystem which we cannot do without.
- *
- * systemd is questionable here. The way callers currently use this, if systemd
- * is not mounted then it will be ignored. But if systemd is mounted, then it
- * must be setup so that lxc can create cgroups in it, else containers will
- * fail.
- *
- * cgroups listed in lxc.cgroup.use are also treated as crucial
- *
- */
-bool is_crucial_cgroup_subsystem(const char *s)
-{
-	const char *cgroup_use;
-
-	if (strcmp(s, "systemd") == 0)
-		return true;
-
-	if (strcmp(s, "name=systemd") == 0)
-		return true;
-
-	if (strcmp(s, "freezer") == 0)
-		return true;
-
-	cgroup_use = lxc_global_config_value("lxc.cgroup.use");
-	if (cgroup_use && strstr(cgroup_use, s))
-		return true;
-
-	return false;
-}

src/lxc/cgroups/cgroup.h

@@ -149,6 +149,5 @@ extern struct cgroup_ops *cgroup_init(struct lxc_handler *handler);
 extern void cgroup_exit(struct cgroup_ops *ops);
 
 extern void prune_init_scope(char *cg);
-extern bool is_crucial_cgroup_subsystem(const char *s);
 
 #endif