linux-kernel - [tip:perf/core] perf tools: Do not put a variable sized type not at the end of a struct

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Date:   Thu, 16 Feb 2017 12:02:30 -0800
From:   tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     acme@...hat.com, dsahern@...il.com, hpa@...or.com,
        namhyung@...nel.org, mingo@...nel.org, adrian.hunter@...el.com,
        linux-kernel@...r.kernel.org, wangnan0@...wei.com,
        jolsa@...nel.org, tglx@...utronix.de
Subject: [tip:perf/core] perf tools: Do not put a variable sized type not at
 the end of a struct

Commit-ID:  89896051f8dae5a04ada1f5fbeeaedc23f484f68
Gitweb:     http://git.kernel.org/tip/89896051f8dae5a04ada1f5fbeeaedc23f484f68
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Tue, 14 Feb 2017 10:59:04 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 14 Feb 2017 15:19:19 -0300

perf tools: Do not put a variable sized type not at the end of a struct

As this is a GNU extension and while harmless in this case, we can do
the same thing in a more clearer way by using an existing thread_map
constructor.

With this we avoid this while compiling with clang:

  util/parse-events.c:2024:21: error: field 'map' with variable sized type 'struct thread_map' not at the end of a struct or class is a GNU extension
        [-Werror,-Wgnu-variable-sized-type-not-at-end]
                  struct thread_map map;
                                  ^
  1 error generated.

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-tqocbplnyyhpst6drgm2u4m3@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/parse-events.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 07be076..281e44a 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -2020,17 +2020,14 @@ static bool is_event_supported(u8 type, unsigned config)
 		.config = config,
 		.disabled = 1,
 	};
-	struct {
-		struct thread_map map;
-		int threads[1];
-	} tmap = {
-		.map.nr	 = 1,
-		.threads = { 0 },
-	};
+	struct thread_map *tmap = thread_map__new_by_tid(0);
+
+	if (tmap == NULL)
+		return false;
 
 	evsel = perf_evsel__new(&attr);
 	if (evsel) {
-		open_return = perf_evsel__open(evsel, NULL, &tmap.map);
+		open_return = perf_evsel__open(evsel, NULL, tmap);
 		ret = open_return >= 0;
 
 		if (open_return == -EACCES) {
@@ -2042,7 +2039,7 @@ static bool is_event_supported(u8 type, unsigned config)
 			 *
 			 */
 			evsel->attr.exclude_kernel = 1;
-			ret = perf_evsel__open(evsel, NULL, &tmap.map) >= 0;
+			ret = perf_evsel__open(evsel, NULL, tmap) >= 0;
 		}
 		perf_evsel__delete(evsel);
 	}