[PATCH] selftests: Warn about skipped tests in result summary

[Laura Nao <laura.nao@collabora.com>]

Update the functions that print the test totals at the end of a selftest
to include a warning message when skipped tests are detected. The
message advises users that skipped tests may indicate missing
configuration options and suggests enabling them to improve coverage.

Signed-off-by: Laura Nao <laura.nao@collabora.com>
---
This patch follows up on a previous discussion[1] and aims to highlight
skipped tests for the user's attention.

[1] https://lore.kernel.org/lkml/2bb2d338-cd00-4ac2-b8bd-5579eae82637@linuxfoundation.org/
---
 tools/testing/selftests/kselftest.h               | 4 ++++
 tools/testing/selftests/kselftest/ksft.py         | 3 +++
 tools/testing/selftests/kselftest/ktap_helpers.sh | 4 ++++
 3 files changed, 11 insertions(+)

diff --git a/tools/testing/selftests/kselftest.h b/tools/testing/selftests/kselftest.h
index 29fedf609611..d3f64b333acd 100644
--- a/tools/testing/selftests/kselftest.h
+++ b/tools/testing/selftests/kselftest.h
@@ -147,6 +147,10 @@ static inline void ksft_set_plan(unsigned int plan)
 
 static inline void ksft_print_cnts(void)
 {
+	if (ksft_cnt.ksft_xskip > 0)
+		printf(
+			"# Skipped tests detected. Consider enabling relevant config options to improve coverage.\n"
+		);
 	if (ksft_plan != ksft_test_num())
 		printf("# Planned tests != run tests (%u != %u)\n",
 			ksft_plan, ksft_test_num());
diff --git a/tools/testing/selftests/kselftest/ksft.py b/tools/testing/selftests/kselftest/ksft.py
index bf215790a89d..7675a15a1264 100644
--- a/tools/testing/selftests/kselftest/ksft.py
+++ b/tools/testing/selftests/kselftest/ksft.py
@@ -27,6 +27,9 @@ def set_plan(num_tests):
 
 
 def print_cnts():
+    if ksft_cnt['skip'] > 0:
+        print("# Skipped tests detected. Consider enabling relevant config options to improve coverage.")
+
     print(
         f"# Totals: pass:{ksft_cnt['pass']} fail:{ksft_cnt['fail']} xfail:0 xpass:0 skip:{ksft_cnt['skip']} error:0"
     )
diff --git a/tools/testing/selftests/kselftest/ktap_helpers.sh b/tools/testing/selftests/kselftest/ktap_helpers.sh
index 79a125eb24c2..a4211221ccd6 100644
--- a/tools/testing/selftests/kselftest/ktap_helpers.sh
+++ b/tools/testing/selftests/kselftest/ktap_helpers.sh
@@ -107,5 +107,9 @@ ktap_finished() {
 }
 
 ktap_print_totals() {
+	if [ "$KTAP_CNT_SKIP" -gt 0 ]; then
+		echo "# Skipped tests detected. " \
+			"Consider enabling relevant config options to improve coverage."
+	fi
 	echo "# Totals: pass:$KTAP_CNT_PASS fail:$KTAP_CNT_FAIL xfail:0 xpass:0 skip:$KTAP_CNT_SKIP error:0"
 }
-- 
2.30.2