linux-kernel - [PATCH v3 5/5] selftests/resctrl: Fix resctrl_tests' return code to work with selftest framework

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Message-Id: <20220216022641.2998318-6-tan.shaopeng@jp.fujitsu.com>
Date:   Wed, 16 Feb 2022 11:26:41 +0900
From:   Shaopeng Tan <tan.shaopeng@...fujitsu.com>
To:     Fenghua Yu <fenghua.yu@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Shuah Khan <shuah@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        tan.shaopeng@...fujitsu.com
Subject: [PATCH v3 5/5] selftests/resctrl: Fix resctrl_tests' return code to work with selftest framework

In kselftest framework, if a sub test can not run by some reasons,
the test result should be marked as SKIP rather than FAIL.
Return KSFT_SKIP(4) instead of KSFT_FAIL(1) if resctrl_tests is not run
as root or it is run on a test environment which does not support resctrl.

 - ksft_exit_fail_msg(): returns KSFT_FAIL(1)
 - ksft_exit_skip(): returns KSFT_SKIP(4)

Signed-off-by: Shaopeng Tan <tan.shaopeng@...fujitsu.com>
---
Some important feedbacks from v1&v2 are addressed as follows:

- It is important to highlight that a skipped test is marked
  as successful to not unnecessarily report a feature failure
  when there actually is a failure in the test environment.
  => I highligted this content in changelog as follows.
     "In kselftest framework, if a test is not run by some reason,
     the test result is marked as SKIP rather than FAIL."

- The subject line can be made more succinct while the details are
  moved to the commit message.
  => I made subject line succinct and moved the details to changelog.

- How changing ksft_exit_fail_msg() to ksft_exit_skip() accomplishes
  the goal of unifying the return code.
  => In changelog, I explained why return code KSFT_SKIP(4) is needed
     in kselftest framework and the return code of each function.

 tools/testing/selftests/resctrl/resctrl_tests.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c
index 973f09a66e1e..3be0895c492b 100644
--- a/tools/testing/selftests/resctrl/resctrl_tests.c
+++ b/tools/testing/selftests/resctrl/resctrl_tests.c
@@ -205,7 +205,7 @@ int main(int argc, char **argv)
 	 * 2. We execute perf commands
 	 */
 	if (geteuid() != 0)
-		return ksft_exit_fail_msg("Not running as root, abort testing.\n");
+		return ksft_exit_skip("Not running as root, abort testing.\n");
 
 	/* Detect AMD vendor */
 	detect_amd();
@@ -235,7 +235,7 @@ int main(int argc, char **argv)
 	sprintf(bm_type, "fill_buf");
 
 	if (!check_resctrlfs_support())
-		return ksft_exit_fail_msg("resctrl FS does not exist\n");
+		return ksft_exit_skip("resctrl FS does not exist\n");
 
 	filter_dmesg();
 
-- 
2.27.0