linux-kernel - [tip:perf/core] perf tests: Synthesize struct instead of using field after variable sized type

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Date:   Thu, 16 Feb 2017 12:01:31 -0800
From:   tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, wangnan0@...wei.com, jolsa@...nel.org,
        mingo@...nel.org, dsahern@...il.com, linux-kernel@...r.kernel.org,
        namhyung@...nel.org, hpa@...or.com, adrian.hunter@...el.com,
        acme@...hat.com
Subject: [tip:perf/core] perf tests: Synthesize struct instead of using
 field after variable sized type

Commit-ID:  423d856a4d6ab26a50309fd051f2bdf0e5d00fd6
Gitweb:     http://git.kernel.org/tip/423d856a4d6ab26a50309fd051f2bdf0e5d00fd6
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Tue, 14 Feb 2017 15:04:48 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 14 Feb 2017 15:19:18 -0300

perf tests: Synthesize struct instead of using field after variable sized type

End result is the same, its an ABI, so the struct won't change, avoid
using a GNU extension, so that we can catch other cases that may be bugs.

Caught when building with clang:

  tests/parse-no-sample-id-all.c:53:20: error: field 'attr' with variable sized type 'struct attr_event' not at the end of a struct or class is a GNU extension
        [-Werror,-Wgnu-variable-sized-type-not-at-end]
          struct attr_event attr;
                            ^
  1 error generated.

Testing it:

  # perf test sample_id
  24: Parse with no sample_id_all bit set        : Ok
  #

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Wang Nan <wangnan0@...wei.com>
Link: http://lkml.kernel.org/n/tip-e2vs1x771fc208uvxnwcf08b@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/tests/parse-no-sample-id-all.c | 19 ++++++++-----------
 1 file changed, 8 insertions(+), 11 deletions(-)

diff --git a/tools/perf/tests/parse-no-sample-id-all.c b/tools/perf/tests/parse-no-sample-id-all.c
index 81c6eea..65dcf48 100644
--- a/tools/perf/tests/parse-no-sample-id-all.c
+++ b/tools/perf/tests/parse-no-sample-id-all.c
@@ -50,7 +50,8 @@ static int process_events(union perf_event **events, size_t count)
 }
 
 struct test_attr_event {
-	struct attr_event attr;
+	struct perf_event_header header;
+	struct perf_event_attr	 attr;
 	u64 id;
 };
 
@@ -71,20 +72,16 @@ int test__parse_no_sample_id_all(int subtest __maybe_unused)
 	int err;
 
 	struct test_attr_event event1 = {
-		.attr = {
-			.header = {
-				.type = PERF_RECORD_HEADER_ATTR,
-				.size = sizeof(struct test_attr_event),
-			},
+		.header = {
+			.type = PERF_RECORD_HEADER_ATTR,
+			.size = sizeof(struct test_attr_event),
 		},
 		.id = 1,
 	};
 	struct test_attr_event event2 = {
-		.attr = {
-			.header = {
-				.type = PERF_RECORD_HEADER_ATTR,
-				.size = sizeof(struct test_attr_event),
-			},
+		.header = {
+			.type = PERF_RECORD_HEADER_ATTR,
+			.size = sizeof(struct test_attr_event),
 		},
 		.id = 2,
 	};