[tip:perf/core] perf evsel: Ensure reserved member of PERF_SAMPLE_CPU is zero in perf_event__synthesize_sample()

[tip-bot for Adrian Hunter]

Commit-ID:  59a87fdad1467d228acc5cb1303b0b568a9e86a8
Gitweb:     https://git.kernel.org/tip/59a87fdad1467d228acc5cb1303b0b568a9e86a8
Author:     Adrian Hunter <adrian.hunter@xxxxxxxxx>
AuthorDate: Tue, 16 Jan 2018 15:14:51 +0200
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Thu, 18 Jan 2018 09:00:45 -0300

perf evsel: Ensure reserved member of PERF_SAMPLE_CPU is zero in perf_event__synthesize_sample()

PERF_SAMPLE_CPU contains the cpu number in the first 4 bytes and the
second 4 bytes are reserved. Ensure the reserved bytes are zero in
perf_event__synthesize_sample().

Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1516108492-21401-3-git-send-email-adrian.hunter@xxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/evsel.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 85eb84d..4403267 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2533,6 +2533,7 @@ int perf_event__synthesize_sample(union perf_event *event, u64 type,
 
 	if (type & PERF_SAMPLE_CPU) {
 		u.val32[0] = sample->cpu;
+		u.val32[1] = 0;
 		if (swapped) {
 			/*
 			 * Inverse of what is done in perf_evsel__parse_sample