[PATCH 1/2] kunit: Add ability to skip entire test suites

[Vaibhav Jain <vaibhav@linux.ibm.com>]

Currently, KUnit provides mechanisms to skip individual test cases, but
there is no way to skip an entire test suite based on runtime conditions
checked during suite initialization. This limitation forces test suites
to either fail or skip tests individually when certain prerequisites are
not available.

To address this limitation, the patch adds a 'status' field to struct
kunit_suite that allows suite_init callbacks to mark the entire suite as
KUNIT_SKIPPED. When a suite is marked as skipped, all test cases within
that suite are bypassed without execution.

The patch proposes changes to kunit_suite_has_succeeded() to check suite
status before evaluating individual test case results. Also
kunit_run_tests() is updated to skip suite execution if 'kunit_suite.status'
is set to KUNIT_SKIPPED, thats either set before suite_init or by the
suite_init callback itself.

This enables test suites to perform runtime capability checks in their
'suite_init' callback and gracefully skip all tests when prerequisites are
not met, rather than reporting failures or requiring each test case to
perform redundant checks.

Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
---
 include/kunit/test.h |  1 +
 lib/kunit/test.c     | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/include/kunit/test.h b/include/kunit/test.h
index ce0573e196ce..395221d623f7 100644
--- a/include/kunit/test.h
+++ b/include/kunit/test.h
@@ -285,6 +285,7 @@ struct kunit_suite {
 	struct string_stream *log;
 	int suite_init_err;
 	bool is_init;
+	enum kunit_status status;
 };
 
 /* Stores an array of suites, end points one past the end */
diff --git a/lib/kunit/test.c b/lib/kunit/test.c
index 99773e000e1b..989acc770265 100644
--- a/lib/kunit/test.c
+++ b/lib/kunit/test.c
@@ -214,6 +214,9 @@ enum kunit_status kunit_suite_has_succeeded(struct kunit_suite *suite)
 	const struct kunit_case *test_case;
 	enum kunit_status status = KUNIT_SKIPPED;
 
+	if (suite->status == KUNIT_SKIPPED)
+		return KUNIT_SKIPPED;
+
 	if (suite->suite_init_err)
 		return KUNIT_FAILURE;
 
@@ -795,12 +798,20 @@ int kunit_run_tests(struct kunit_suite *suite)
 	/* Taint the kernel so we know we've run tests. */
 	add_taint(TAINT_TEST, LOCKDEP_STILL_OK);
 
+	if (suite->status == KUNIT_SKIPPED)
+		goto suite_end;
+
 	if (suite->suite_init) {
 		suite->suite_init_err = suite->suite_init(suite);
 		if (suite->suite_init_err) {
+			suite->status = KUNIT_FAILURE;
 			kunit_err(suite, KUNIT_SUBTEST_INDENT
 				  "# failed to initialize (%d)", suite->suite_init_err);
 			goto suite_end;
+
+		} else if (suite->status == KUNIT_SKIPPED) {
+			/* Skip this kunit suite */
+			goto suite_end;
 		}
 	}
 
-- 
2.54.0