1 files changed, 9 insertions, 0 deletions

diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h
index afc1343df3c7..0f3172b8b225 100644
--- a/include/linux/blktrace_api.h
+++ b/include/linux/blktrace_api.h
@@ -57,6 +57,14 @@ void __trace_note_message(struct blk_trace *, const char *fmt, ...);
         } while (0)
 #define BLK_TN_MAX_MSG          128
 
+static inline bool blk_trace_note_message_enabled(struct request_queue *q)
+{
+        struct blk_trace *bt = q->blk_trace;
+        if (likely(!bt))
+                return false;
+        return bt->act_mask & BLK_TC_NOTIFY;
+}
+
 extern void blk_add_driver_data(struct request_queue *q, struct request *rq,
                                 void *data, size_t len);
 extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
@@ -79,6 +87,7 @@ extern struct attribute_group blk_trace_attr_group;
 # define blk_trace_remove(q)                            (-ENOTTY)
 # define blk_add_trace_msg(q, fmt, ...)                 do { } while (0)
 # define blk_trace_remove_sysfs(dev)                    do { } while (0)
+# define blk_trace_note_message_enabled(q)              (false)
 static inline int blk_trace_init_sysfs(struct device *dev)
 {
         return 0;