linux-kernel - [PATCH v2] selftests/kcmp: Make the test output consistent and clear

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Date:   Thu, 14 Jul 2022 21:46:29 +0530
From:   Gautam Menghani <gautammenghani201@...il.com>
To:     shuah@...nel.org
Cc:     Gautam Menghani <gautammenghani201@...il.com>,
        linux-kselftest@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] selftests/kcmp: Make the test output consistent and clear

In the KCMP test, currently the functions ksft_print_header() and
ksft_set_plan() are not used due to which an error appears in the
output. Also, the result of the tests is being printed multiple times
because the output is printed by both ksft_print_cnts() and
ksft_exit_fail()/ksft_exit_pass(). 
This patch makes the output format of this test consistent. Currently the
output is as follows:

+TAP version 13
+1..1
+# selftests: kcmp: kcmp_test
+# pid1:  45814 pid2:  45815 FD:  1 FILES:  1 VM:  2 FS:  1 SIGHAND:  2 
+  IO:  0 SYSVSEM:  0 INV: -1
+# PASS: 0 returned as expected
+# PASS: 0 returned as expected
+# PASS: 0 returned as expected
+# # Planned tests != run tests (0 != 3)
+# # Totals: pass:3 fail:0 xfail:0 xpass:0 skip:0 error:0
+# # Planned tests != run tests (0 != 3)
+# # Totals: pass:3 fail:0 xfail:0 xpass:0 skip:0 error:0
+# # Totals: pass:0 fail:0 xfail:0 xpass:0 skip:0 error:0
+ok 1 selftests: kcmp: kcmp_test

With this patch applied the output is as follows:

+TAP version 13
+1..1
+# selftests: kcmp: kcmp_test
+# TAP version 13
+# 1..3
+# pid1:  46330 pid2:  46331 FD:  1 FILES:  2 VM:  2 FS:  2 SIGHAND:  1 
+  IO:  0 SYSVSEM:  0 INV: -1
+# PASS: 0 returned as expected
+# PASS: 0 returned as expected
+# PASS: 0 returned as expected
+# # Totals: pass:3 fail:0 xfail:0 xpass:0 skip:0 error:0
+ok 1 selftests: kcmp: kcmp_test


Signed-off-by: Gautam Menghani <gautammenghani201@...il.com>
---
Changes in v2:
1. Describe the changes in detail.

 tools/testing/selftests/kcmp/kcmp_test.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/kcmp/kcmp_test.c b/tools/testing/selftests/kcmp/kcmp_test.c
index 6ea7b9f37a41..25110c7c0b3e 100644
--- a/tools/testing/selftests/kcmp/kcmp_test.c
+++ b/tools/testing/selftests/kcmp/kcmp_test.c
@@ -88,6 +88,9 @@ int main(int argc, char **argv)
 		int pid2 = getpid();
 		int ret;
 
+		ksft_print_header();
+		ksft_set_plan(3);
+
 		fd2 = open(kpath, O_RDWR, 0644);
 		if (fd2 < 0) {
 			perror("Can't open file");
@@ -152,7 +155,6 @@ int main(int argc, char **argv)
 			ksft_inc_pass_cnt();
 		}
 
-		ksft_print_cnts();
 
 		if (ret)
 			ksft_exit_fail();
@@ -162,5 +164,5 @@ int main(int argc, char **argv)
 
 	waitpid(pid2, &status, P_ALL);
 
-	return ksft_exit_pass();
+	return 0;
 }
-- 
2.36.1