[RFC PATCH] lib/stackdepot: stack_depot_init_mutex can be static

[kernel test robot]

lib/stackdepot.c:150:1: warning: symbol 'stack_depot_init_mutex' was not declared. Should it be static?

Reported-by: kernel test robot <lkp at intel.com>
Signed-off-by: kernel test robot <lkp at intel.com>
---
 stackdepot.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index 9bb5333bf02f61..89b67aef9b320b 100644
--- a/lib/stackdepot.c
+++ b/lib/stackdepot.c
@@ -147,7 +147,7 @@ static struct stack_record *depot_alloc_stack(unsigned long *entries, int size,
 #define STACK_HASH_MASK (STACK_HASH_SIZE - 1)
 #define STACK_HASH_SEED 0x9747b28c
 
-DEFINE_MUTEX(stack_depot_init_mutex);
+static DEFINE_MUTEX(stack_depot_init_mutex);
 static bool stack_depot_disable;
 static struct stack_record **stack_table;