From 6fd66507378bd8706cba38f82167a54d9d116e43 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Tue, 1 Sep 2015 18:36:28 +0200
Subject: [PATCH] cgroup: the root cgroup is always populated

---
 src/basic/cgroup-util.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/basic/cgroup-util.c b/src/basic/cgroup-util.c
index 61681ada8d..98adace55a 100644
--- a/src/basic/cgroup-util.c
+++ b/src/basic/cgroup-util.c
@@ -918,6 +918,10 @@ int cg_is_empty_recursive(const char *controller, const char *path) {
 
         assert(path);
 
+        /* The root cgroup is always populated */
+        if (controller && (isempty(path) || path_equal(path, "/")))
+                return 0;
+
         r = cg_is_empty(controller, path);
         if (r <= 0)
                 return r;