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Subject[tip:perf/core] perf tests: Fix to get negative exit codes
Commit-ID:  189c466f77d421aef5c196454ab2e9517af7abc9
Gitweb: http://git.kernel.org/tip/189c466f77d421aef5c196454ab2e9517af7abc9
Author: He Kuang <hekuang@huawei.com>
AuthorDate: Mon, 11 May 2015 12:28:35 +0000
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 12 May 2015 09:59:50 -0300

perf tests: Fix to get negative exit codes

WEXITSTATUS consists of the least significant 8 bits of the status
argument, so we should convert the value to signed char if we have valid
negative exit codes. And the return value of test->func() contains
negative values:

enum {
TEST_OK = 0,
TEST_FAIL = -1,
TEST_SKIP = -2,
};

Before this patch:

$ perf test -v 1
...
test child finished with 254
---- end ----
vmlinux symtab matches kallsyms: FAILED!

After this patch:

$ perf test -v 1
...
test child finished with -2
---- end ----
vmlinux symtab matches kallsyms: Skip

Signed-off-by: He Kuang <hekuang@huawei.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1431347316-30401-1-git-send-email-hekuang@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/tests/builtin-test.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index 4f40981..f42af98 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -219,7 +219,7 @@ static int run_test(struct test *test)
wait(&status);

if (WIFEXITED(status)) {
- err = WEXITSTATUS(status);
+ err = (signed char)WEXITSTATUS(status);
pr_debug("test child finished with %d\n", err);
} else if (WIFSIGNALED(status)) {
err = -1;

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