[tip:perf/core] perf test attr: Fix ignored test case result

[tip-bot for Thomas Richter]

Commit-ID:  22905582f6dd4bbd0c370fe5732c607452010c04
Gitweb:     https://git.kernel.org/tip/22905582f6dd4bbd0c370fe5732c607452010c04
Author:     Thomas Richter <tmricht@xxxxxxxxxxxxxxxxxx>
AuthorDate: Wed, 13 Sep 2017 10:12:09 +0200
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Mon, 2 Oct 2017 14:00:57 -0300

perf test attr: Fix ignored test case result

Command perf test -v 16 (Setup struct perf_event_attr test) always
reports success even if the test case fails.  It works correctly if you
also specify -F (for don't fork).

   root@s35lp76 perf]# ./perf test -v 16
   15: Setup struct perf_event_attr               :
   --- start ---
   running './tests/attr/test-record-no-delay'
   [ perf record: Woken up 1 times to write data ]
   [ perf record: Captured and wrote 0.002 MB /tmp/tmp4E1h7R/perf.data
     (1 samples) ]
   expected task=0, got 1
   expected precise_ip=0, got 3
   expected wakeup_events=1, got 0
   FAILED './tests/attr/test-record-no-delay' - match failure
   test child finished with 0
   ---- end ----
   Setup struct perf_event_attr: Ok

The reason for the wrong error reporting is the return value of the
system() library call. It is called in run_dir() file tests/attr.c and
returns the exit status, in above case 0xff00.

This value is given as parameter to the exit() function which can only
handle values 0-0xff.

The child process terminates with exit value of 0 and the parent does
not detect any error.

This patch corrects the error reporting and prints the correct test
result.

Signed-off-by: Thomas-Mich Richter <tmricht@xxxxxxxxxxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Hendrik Brueckner <brueckner@xxxxxxxxxxxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Thomas-Mich Richter <tmricht@xxxxxxxxxxxxxxxxxx>
LPU-Reference: 20170913081209.39570-2-tmricht@xxxxxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/n/tip-rdube6rfcjsr1nzue72c7lqn@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/tests/attr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/tests/attr.c b/tools/perf/tests/attr.c
index c9aafed..25ede44 100644
--- a/tools/perf/tests/attr.c
+++ b/tools/perf/tests/attr.c
@@ -166,7 +166,7 @@ static int run_dir(const char *d, const char *perf)
 	snprintf(cmd, 3*PATH_MAX, PYTHON " %s/attr.py -d %s/attr/ -p %s %.*s",
 		 d, d, perf, vcnt, v);
 
-	return system(cmd);
+	return system(cmd) ? TEST_FAIL : TEST_OK;
 }
 
 int test__attr(struct test *test __maybe_unused, int subtest __maybe_unused)