ring-buffer: add tracing_is_on to test if ring buffer is enabled
This patch adds the tracing_is_on() interface to tell if the ring
buffer is turned on or not.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
diff --git a/include/linux/ring_buffer.h b/include/linux/ring_buffer.h
index 8e6646a..f5e793d 100644
--- a/include/linux/ring_buffer.h
+++ b/include/linux/ring_buffer.h
@@ -128,10 +128,12 @@
void tracing_on(void);
void tracing_off(void);
void tracing_off_permanent(void);
+int tracing_is_on(void);
#else
static inline void tracing_on(void) { }
static inline void tracing_off(void) { }
static inline void tracing_off_permanent(void) { }
+static inline int tracing_is_on(void) { return 0; }
#endif
void *ring_buffer_alloc_read_page(struct ring_buffer *buffer);