[tip:perf/core] perf report: Fix regression when decoding Intel-PT traces

[tip-bot for Mathieu Poirier]

Commit-ID:  f785657b0fbe69fb3f5dfb0a7567cdb0777e57d1
Gitweb:     https://git.kernel.org/tip/f785657b0fbe69fb3f5dfb0a7567cdb0777e57d1
Author:     Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
AuthorDate: Thu, 14 Dec 2017 10:47:00 -0700
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Mon, 18 Dec 2017 06:26:20 +0100

perf report: Fix regression when decoding Intel-PT traces

Commit:

  93d10af26bb7 ("perf tools: Optimize sample parsing for ordered events")

... breaks Intel-PT trace decoding by invariably returning an error if
the event type isn't a PERF_SAMPLE_TIME.

With this patch the timestamp is initialised and processing is allowed to
continue if the error returned by function
perf_evlist__parse_sample_timestamp() is not a fault.

Signed-off-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: acme@xxxxxxxxxx
Cc: alexander.shishkin@xxxxxxxxxxxxxxx
Cc: jolsa@xxxxxxxxxx
Link: http://lkml.kernel.org/r/1513273620-3351-1-git-send-email-mathieu.poirier@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 tools/perf/util/session.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 54e30f1..eb59dc7 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1508,10 +1508,10 @@ static s64 perf_session__process_event(struct perf_session *session,
 		return perf_session__process_user_event(session, event, file_offset);
 
 	if (tool->ordered_events) {
-		u64 timestamp;
+		u64 timestamp = -1ULL;
 
 		ret = perf_evlist__parse_sample_timestamp(evlist, event, &timestamp);
-		if (ret)
+		if (ret != -1)
 			return ret;
 
 		ret = perf_session__queue_event(session, event, timestamp, file_offset);