1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index e8f05b14cd43..c1124752e1d3 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -132,8 +132,8 @@ void stop_one_cpu_nowait(unsigned int cpu, cpu_stop_fn_t fn, void *arg,
         cpu_stop_queue_work(&per_cpu(cpu_stopper, cpu), work_buf);
 }
 
-DEFINE_MUTEX(stop_cpus_mutex);
 /* static data for stop_cpus */
+static DEFINE_MUTEX(stop_cpus_mutex);
 static DEFINE_PER_CPU(struct cpu_stop_work, stop_cpus_work);
 
 static void queue_stop_cpus_work(const struct cpumask *cpumask,