blktrace: make do_blk_trace_setup() static

This isn't used outside of blktrace.c anymore.

Fixes: 62c2a7d9 ("block: push BKL into blktrace ioctls")
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

include/linux/blktrace_api.h

@@ -30,9 +30,6 @@ struct blk_trace {
 
 extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *);
 extern void blk_trace_shutdown(struct request_queue *);
-extern int do_blk_trace_setup(struct request_queue *q, char *name,
-			      dev_t dev, struct block_device *bdev,
-			      struct blk_user_trace_setup *buts);
 extern __printf(2, 3)
 void __trace_note_message(struct blk_trace *, const char *fmt, ...);
 
@@ -80,7 +77,6 @@ extern struct attribute_group blk_trace_attr_group;
 #else /* !CONFIG_BLK_DEV_IO_TRACE */
 # define blk_trace_ioctl(bdev, cmd, arg)		(-ENOTTY)
 # define blk_trace_shutdown(q)				do { } while (0)
-# define do_blk_trace_setup(q, name, dev, bdev, buts)	(-ENOTTY)
 # define blk_add_driver_data(q, rq, data, len)		do {} while (0)
 # define blk_trace_setup(q, name, dev, bdev, arg)	(-ENOTTY)
 # define blk_trace_startstop(q, start)			(-ENOTTY)

kernel/trace/blktrace.c

@@ -433,7 +433,7 @@ static void blk_trace_setup_lba(struct blk_trace *bt,
 /*
  * Setup everything required to start tracing
  */
-int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
+static int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
 			      struct block_device *bdev,
 			      struct blk_user_trace_setup *buts)
 {