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-rw-r--r--include/linux/ring_buffer.h16
1 files changed, 12 insertions, 4 deletions
diff --git a/include/linux/ring_buffer.h b/include/linux/ring_buffer.h
index e097c2e6b6dc..d363467c8f13 100644
--- a/include/linux/ring_buffer.h
+++ b/include/linux/ring_buffer.h
@@ -28,17 +28,19 @@ struct ring_buffer_event {
* size = 8 bytes
*
* @RINGBUF_TYPE_TIME_STAMP: Sync time stamp with external clock
- * array[0] = tv_nsec
- * array[1] = tv_sec
+ * array[0] = tv_nsec
+ * array[1..2] = tv_sec
* size = 16 bytes
*
* @RINGBUF_TYPE_DATA: Data record
* If len is zero:
* array[0] holds the actual length
- * array[1..(length+3)/4-1] holds data
+ * array[1..(length+3)/4] holds data
+ * size = 4 + 4 + length (bytes)
* else
* length = len << 2
- * array[0..(length+3)/4] holds data
+ * array[0..(length+3)/4-1] holds data
+ * size = 4 + length (bytes)
*/
enum ring_buffer_type {
RINGBUF_TYPE_PADDING,
@@ -122,6 +124,12 @@ void ring_buffer_normalize_time_stamp(int cpu, u64 *ts);
void tracing_on(void);
void tracing_off(void);
+void tracing_off_permanent(void);
+
+void *ring_buffer_alloc_read_page(struct ring_buffer *buffer);
+void ring_buffer_free_read_page(struct ring_buffer *buffer, void *data);
+int ring_buffer_read_page(struct ring_buffer *buffer,
+ void **data_page, int cpu, int full);
enum ring_buffer_flags {
RB_FL_OVERWRITE = 1 << 0,