selftests/powerpc: Add support for skipping tests

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

tools/testing/selftests/powerpc/harness.c

@@ -105,7 +105,10 @@ int test_harness(int (test_function)(void), char *name)
 
 	rc = run_test(test_function, name);
 
-	test_finish(name, rc);
+	if (rc == MAGIC_SKIP_RETURN_VALUE)
+		test_skip(name);
+	else
+		test_finish(name, rc);
 
 	return rc;
 }

tools/testing/selftests/powerpc/subunit.h

@@ -26,6 +26,11 @@ static inline void test_error(char *name)
 	printf("error: %s\n", name);
 }
 
+static inline void test_skip(char *name)
+{
+	printf("skip: %s\n", name);
+}
+
 static inline void test_success(char *name)
 {
 	printf("success: %s\n", name);

tools/testing/selftests/powerpc/utils.h

@@ -31,6 +31,18 @@ do {								\
 	}							\
 } while (0)
 
+/* The test harness uses this, yes it's gross */
+#define MAGIC_SKIP_RETURN_VALUE	99
+
+#define SKIP_IF(x)						\
+do {								\
+	if ((x)) {						\
+		fprintf(stderr,					\
+		"[SKIP] Test skipped on line %d\n", __LINE__);	\
+		return MAGIC_SKIP_RETURN_VALUE;			\
+	}							\
+} while (0)
+
 #define _str(s) #s
 #define str(s) _str(s)