1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c
index e822cb0e18d5..1a26ef5b7d58 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -361,6 +361,9 @@ static int _cpu_down(unsigned int cpu, int tasks_frozen)
 	if (!cpu_online(cpu))
 		return -EINVAL;
 
+	if (!tasks_frozen && !cpu_isolated(cpu) && num_online_uniso_cpus() == 1)
+		return -EBUSY;
+
 	cpu_hotplug_begin();
 
 	err = __cpu_notify(CPU_DOWN_PREPARE | mod, hcpu, -1, &nr_calls);