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

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Date:   Sun, 17 Dec 2017 21:31:46 -0800
From:   tip-bot for Mathieu Poirier <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, peterz@...radead.org,
        linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
        mathieu.poirier@...aro.org, hpa@...or.com, mingo@...nel.org,
        jolsa@...nel.org
Subject: [tip:perf/core] perf report: Fix regression when decoding Intel-PT
 traces

Commit-ID:  f785657b0fbe69fb3f5dfb0a7567cdb0777e57d1
Gitweb:     https://git.kernel.org/tip/f785657b0fbe69fb3f5dfb0a7567cdb0777e57d1
Author:     Mathieu Poirier <mathieu.poirier@...aro.org>
AuthorDate: Thu, 14 Dec 2017 10:47:00 -0700
Committer:  Ingo Molnar <mingo@...nel.org>
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@...aro.org>
Acked-by: Jiri Olsa <jolsa@...nel.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: acme@...nel.org
Cc: alexander.shishkin@...ux.intel.com
Cc: jolsa@...hat.com
Link: http://lkml.kernel.org/r/1513273620-3351-1-git-send-email-mathieu.poirier@linaro.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 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);