1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/stop_machine.h b/include/linux/stop_machine.h
index 092dc9b1ce7d..14d3524d1274 100644
--- a/include/linux/stop_machine.h
+++ b/include/linux/stop_machine.h
@@ -27,6 +27,8 @@ struct cpu_stop_work {
         struct cpu_stop_done    *done;
 };
 
+extern struct mutex stop_cpus_mutex;
+
 int stop_one_cpu(unsigned int cpu, cpu_stop_fn_t fn, void *arg);
 void stop_one_cpu_nowait(unsigned int cpu, cpu_stop_fn_t fn, void *arg,
                          struct cpu_stop_work *work_buf);