Capture that events are 8-byte aligned and avoid later misaligned
event problems.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/builtin-record.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index adbaf80b398c..a5689d0e93ad 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -624,7 +624,10 @@ static int process_synthesized_event(const struct perf_tool *tool,
 				     struct machine *machine __maybe_unused)
 {
 	struct record *rec = container_of(tool, struct record, tool);
-	return record__write(rec, NULL, event, event->header.size);
+	size_t size = event->header.size;
+
+	assert(PERF_ALIGN(size, sizeof(u64)) == size);
+	return record__write(rec, NULL, event, size);
 }
 
 static struct mutex synth_lock;
-- 
2.47.1.613.gc27f4b7a9f-goog