linux-kernel - [PATCH v2 4/4] perf record: Assert synthesized events are 8-byte aligned

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Message-Id: <20241216014637.304761-5-irogers@google.com>
Date: Sun, 15 Dec 2024 17:46:37 -0800
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, Sun Haiyong <sunhaiyong@...ngson.cn>, 
	Yanteng Si <siyanteng@...ngson.cn>, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 4/4] perf record: Assert synthesized events are 8-byte aligned

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

Signed-off-by: Ian Rogers <irogers@...gle.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