cgroup-util: drop cg_freezer_supported(), assume supported

src/basic/cgroup-util.c

@@ -254,22 +254,6 @@ bool cg_ns_supported(void) {
         return (supported = false);
 }
 
-bool cg_freezer_supported(void) {
-        static thread_local int supported = -1;
-
-        if (supported >= 0)
-                return supported;
-
-        if (cg_all_unified() <= 0)
-                return (supported = false);
-
-        if (access("/sys/fs/cgroup/init.scope/cgroup.freeze", F_OK) >= 0)
-                return (supported = true);
-        if (errno != ENOENT)
-                log_debug_errno(errno, "Failed to check whether cgroup freezer is available, assuming not: %m");
-        return (supported = false);
-}
-
 bool cg_kill_supported(void) {
         static thread_local int supported = -1;
 

src/basic/cgroup-util.h

@@ -312,7 +312,6 @@ int cg_mask_from_string(const char *s, CGroupMask *ret);
 int cg_mask_to_string(CGroupMask mask, char **ret);
 
 bool cg_ns_supported(void);
-bool cg_freezer_supported(void);
 bool cg_kill_supported(void);
 
 int cg_all_unified(void);

src/core/cgroup.c

@@ -4386,9 +4386,6 @@ int unit_cgroup_freezer_action(Unit *u, FreezerAction action) {
         assert(action >= 0);
         assert(action < _FREEZER_ACTION_MAX);
 
-        if (!cg_freezer_supported())
-                return 0;
-
         unit_next_freezer_state(u, action, &next, &objective);
 
         CGroupRuntime *crt = unit_get_cgroup_runtime(u);

src/core/unit.c

@@ -6296,7 +6296,7 @@ int unit_freezer_action(Unit *u, FreezerAction action) {
         assert(u);
         assert(IN_SET(action, FREEZER_FREEZE, FREEZER_THAW));
 
-        if (!cg_freezer_supported() || !unit_can_freeze(u))
+        if (!unit_can_freeze(u))
                 return -EOPNOTSUPP;
 
         if (u->job)