[RFC PATCH] bcache: bch_service_ioctl_ctrl() can be static

[kernel test robot <lkp@xxxxxxxxx>]

drivers/md/bcache/control.c:18:6: warning: symbol 'bch_service_ioctl_ctrl' was not declared. Should it be static?

Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: kernel test robot <lkp@xxxxxxxxx>
---
 drivers/md/bcache/control.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/bcache/control.c b/drivers/md/bcache/control.c
index dad432613474b..69b5e554d0935 100644
--- a/drivers/md/bcache/control.c
+++ b/drivers/md/bcache/control.c
@@ -15,7 +15,7 @@ static struct bch_ctrl_device _control_device;
 
 /* this handles IOCTL for /dev/bcache_ctrl */
 /*********************************************/
-long bch_service_ioctl_ctrl(struct file *filp, unsigned int cmd,
+static long bch_service_ioctl_ctrl(struct file *filp, unsigned int cmd,
 		unsigned long arg)
 {
 	int retval = 0;