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authorRobert Richter <robert.richter@amd.com>2009-01-07 15:32:11 +0100
committerRobert Richter <robert.richter@amd.com>2009-01-07 22:47:40 +0100
commit465634adc1d09b490c8ee31885575be39d375d53 (patch)
treeb6c119d0112b428104dbd4edbd23925d717d7119 /kernel/trace
parent1acda878e20ea0cd3708ba66dca67d52eaafdd2b (diff)
ring_buffer: fix ring_buffer_event_length()
Function ring_buffer_event_length() provides an interface to detect the length of data stored in an entry. However, the length contains offsets depending on the internal usage. This makes it unusable. This patch fixes this and now ring_buffer_event_length() returns the alligned length that has been used in ring_buffer_lock_reserve(). Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Robert Richter <robert.richter@amd.com>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/ring_buffer.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 30d57dd01a8..d42b882dfe4 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -117,7 +117,13 @@ rb_event_length(struct ring_buffer_event *event)
*/
unsigned ring_buffer_event_length(struct ring_buffer_event *event)
{
- return rb_event_length(event);
+ unsigned length = rb_event_length(event);
+ if (event->type != RINGBUF_TYPE_DATA)
+ return length;
+ length -= RB_EVNT_HDR_SIZE;
+ if (length > RB_MAX_SMALL_DATA + sizeof(event->array[0]))
+ length -= sizeof(event->array[0]);
+ return length;
}
EXPORT_SYMBOL_GPL(ring_buffer_event_length);