diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index 20dface3c3e0..196645b38b24 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -1923,7 +1923,6 @@ static int update_parent_effective_cpumask(struct cpuset *cs, int cmd,
 		 * A partition error happens when parent has tasks and all
 		 * its effective CPUs will have to be distributed out.
 		 */
-		WARN_ON_ONCE(!is_partition_valid(parent));
 		if (nocpu) {
 			part_error = PERR_NOCPUS;
 			if (is_partition_valid(cs))