linux-kernel - [PATCH v7 10/10] selftests/harness: Handle TEST

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Date: Sat, 11 May 2024 19:14:45 +0200
From: Mickaël Salaün <mic@...ikod.net>
To: Christian Brauner <brauner@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jakub Kicinski <kuba@...nel.org>,
	Kees Cook <keescook@...omium.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mark Brown <broonie@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	Sean Christopherson <seanjc@...gle.com>,
	Shengyu Li <shengyu.li.evgeny@...il.com>,
	Shuah Khan <shuah@...nel.org>,
	Shuah Khan <skhan@...uxfoundation.org>
Cc: Mickaël Salaün <mic@...ikod.net>,
	Bagas Sanjaya <bagasdotme@...il.com>,
	Brendan Higgins <brendanhiggins@...gle.com>,
	David Gow <davidgow@...gle.com>,
	"David S . Miller" <davem@...emloft.net>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Günther Noack <gnoack@...gle.com>,
	Jon Hunter <jonathanh@...dia.com>,
	Ron Economos <re@...z.net>,
	Ronald Warsow <rwarsow@....de>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Will Drewry <wad@...omium.org>,
	kernel test robot <oliver.sang@...el.com>,
	kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	netdev@...r.kernel.org,
	stable@...r.kernel.org
Subject: [PATCH v7 10/10] selftests/harness: Handle TEST_F()'s explicit exit codes

If TEST_F() explicitly calls exit(code) with code different than 0, then
_metadata->exit_code is set to this code (e.g. KVM_ONE_VCPU_TEST()).  We
need to keep in mind that _metadata->exit_code can be KSFT_SKIP while
the process exit code is 0.

Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Kees Cook <keescook@...omium.org>
Cc: Mark Brown <broonie@...nel.org>
Cc: Shuah Khan <shuah@...nel.org>
Cc: Will Drewry <wad@...omium.org>
Reported-by: Sean Christopherson <seanjc@...gle.com>
Tested-by: Sean Christopherson <seanjc@...gle.com>
Closes: https://lore.kernel.org/r/ZjPelW6-AbtYvslu@google.com
Fixes: 0710a1a73fb4 ("selftests/harness: Merge TEST_F_FORK() into TEST_F()")
Signed-off-by: Mickaël Salaün <mic@...ikod.net>
Link: https://lore.kernel.org/r/20240511171445.904356-11-mic@digikod.net
---

Changes since v5:
* Update commit message as suggested by Sean.

Changes since v4:
* Check abort status when the grandchild exited.
* Keep the _exit(0) calls because _metadata->exit_code is always
  checked.
* Only set _metadata->exit_code to WEXITSTATUS() if it is not zero.

Changes since v3:
* New patch mainly from Sean Christopherson.
---
 tools/testing/selftests/kselftest_harness.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h
index cbedb4a6cf7b..3c8f2965c285 100644
--- a/tools/testing/selftests/kselftest_harness.h
+++ b/tools/testing/selftests/kselftest_harness.h
@@ -462,9 +462,13 @@ static inline pid_t clone3_vfork(void)
 		munmap(teardown, sizeof(*teardown)); \
 		if (self && fixture_name##_teardown_parent) \
 			munmap(self, sizeof(*self)); \
-		if (!WIFEXITED(status) && WIFSIGNALED(status)) \
+		if (WIFEXITED(status)) { \
+			if (WEXITSTATUS(status)) \
+				_metadata->exit_code = WEXITSTATUS(status); \
+		} else if (WIFSIGNALED(status)) { \
 			/* Forward signal to __wait_for_test(). */ \
 			kill(getpid(), WTERMSIG(status)); \
+		} \
 		__test_check_assert(_metadata); \
 	} \
 	static struct __test_metadata *_##fixture_name##_##test_name##_object; \
-- 
2.45.0