[PATCH v2 4/4] tools/lib/perf: Get rid of attr.id field

[Namhyung Kim <namhyung@kernel.org>]

Now there's no in-tree user of the field.  To remove the possible bug
later, let's get rid of the 'id' field and add a comment for that.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/lib/perf/include/perf/event.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/lib/perf/include/perf/event.h b/tools/lib/perf/include/perf/event.h
index e563dd8c3628..ae64090184d3 100644
--- a/tools/lib/perf/include/perf/event.h
+++ b/tools/lib/perf/include/perf/event.h
@@ -148,7 +148,13 @@ struct perf_record_switch {
 struct perf_record_header_attr {
 	struct perf_event_header header;
 	struct perf_event_attr	 attr;
-	__u64			 id[];
+	/*
+	 * Array of u64 id follows here but we cannot use a flexible array
+	 * because size of attr in the data can be different then current
+	 * version.  Please use perf_record_header_attr_id() below.
+	 *
+	 * __u64		 id[];  // do not use this
+	 */
 };
 
 /* Returns the pointer to id array based on the actual attr size. */
-- 
2.42.0.rc1.204.g551eb34607-goog