kselftest: add support for skipped tests

Update the kselftest framework to allow client drivers to
specify that some tests were skipped.

Signed-off-by: Timur Tabi <timur@kernel.org>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Tested-by: Petr Mladek <pmladek@suse.com>
Acked-by: Marco Elver <elver@google.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20210214161348.369023-3-timur@kernel.org

Author: Timur Tabi

tools/testing/selftests/kselftest_module.h

@@ -11,7 +11,8 @@
 
 #define KSTM_MODULE_GLOBALS()			\
 static unsigned int total_tests __initdata;	\
-static unsigned int failed_tests __initdata
+static unsigned int failed_tests __initdata;	\
+static unsigned int skipped_tests __initdata
 
 #define KSTM_CHECK_ZERO(x) do {						\
 	total_tests++;							\
@@ -21,11 +22,16 @@ static unsigned int failed_tests __initdata
 	}								\
 } while (0)
 
-static inline int kstm_report(unsigned int total_tests, unsigned int failed_tests)
+static inline int kstm_report(unsigned int total_tests, unsigned int failed_tests,
+			      unsigned int skipped_tests)
 {
-	if (failed_tests == 0)
-		pr_info("all %u tests passed\n", total_tests);
-	else
+	if (failed_tests == 0) {
+		if (skipped_tests) {
+			pr_info("skipped %u tests\n", skipped_tests);
+			pr_info("remaining %u tests passed\n", total_tests);
+		} else
+			pr_info("all %u tests passed\n", total_tests);
+	} else
 		pr_warn("failed %u out of %u tests\n", failed_tests, total_tests);
 
 	return failed_tests ? -EINVAL : 0;
@@ -36,7 +42,7 @@ static int __init __module##_init(void)			\
 {							\
 	pr_info("loaded.\n");				\
 	selftest();					\
-	return kstm_report(total_tests, failed_tests);	\
+	return kstm_report(total_tests, failed_tests, skipped_tests);	\
 }							\
 static void __exit __module##_exit(void)		\
 {							\