selftests: kselftest: Create ksft_print_dbg_msg()

Create ksft_print_dbg_msg() so testers can enable extra debug messages
when running a test with the flag -d.

Signed-off-by: André Almeida <andrealmeid@igalia.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2 files changed, 23 insertions, 4 deletions

diff --git a/tools/testing/selftests/kselftest.h b/tools/testing/selftests/kselftest.h
index c3b6d2604b1e..8deeb4b72e73 100644
--- a/tools/testing/selftests/kselftest.h
+++ b/tools/testing/selftests/kselftest.h
@@ -54,6 +54,7 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <stdarg.h>
+#include <stdbool.h>
 #include <string.h>
 #include <stdio.h>
 #include <sys/utsname.h>
@@ -104,6 +105,7 @@ struct ksft_count {
 
 static struct ksft_count ksft_cnt;
 static unsigned int ksft_plan;
+static bool ksft_debug_enabled;
 
 static inline unsigned int ksft_test_num(void)
 {
@@ -175,6 +177,18 @@ static inline __printf(1, 2) void ksft_print_msg(const char *msg, ...)
 	va_end(args);
 }
 
+static inline void ksft_print_dbg_msg(const char *msg, ...)
+{
+	va_list args;
+
+	if (!ksft_debug_enabled)
+		return;
+
+	va_start(args, msg);
+	ksft_print_msg(msg, args);
+	va_end(args);
+}
+
 static inline void ksft_perror(const char *msg)
 {
 	ksft_print_msg("%s: %s (%d)\n", msg, strerror(errno), errno);
diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h
index 2925e47db995..ffefd2704ca8 100644
--- a/tools/testing/selftests/kselftest_harness.h
+++ b/tools/testing/selftests/kselftest_harness.h
@@ -1091,7 +1091,7 @@ static int test_harness_argv_check(int argc, char **argv)
 {
 	int opt;
 
-	while ((opt = getopt(argc, argv, "hlF:f:V:v:t:T:r:")) != -1) {
+	while ((opt = getopt(argc, argv, "dhlF:f:V:v:t:T:r:")) != -1) {
 		switch (opt) {
 		case 'f':
 		case 'F':
@@ -1104,12 +1104,16 @@ static int test_harness_argv_check(int argc, char **argv)
 		case 'l':
 			test_harness_list_tests();
 			return KSFT_SKIP;
+		case 'd':
+			ksft_debug_enabled = true;
+			break;
 		case 'h':
 		default:
 			fprintf(stderr,
-				"Usage: %s [-h|-l] [-t|-T|-v|-V|-f|-F|-r name]\n"
+				"Usage: %s [-h|-l|-d] [-t|-T|-v|-V|-f|-F|-r name]\n"
 				"\t-h       print help\n"
 				"\t-l       list all tests\n"
+				"\t-d       enable debug prints\n"
 				"\n"
 				"\t-t name  include test\n"
 				"\t-T name  exclude test\n"
@@ -1142,8 +1146,9 @@ static bool test_enabled(int argc, char **argv,
 	int opt;
 
 	optind = 1;
-	while ((opt = getopt(argc, argv, "F:f:V:v:t:T:r:")) != -1) {
-		has_positive |= islower(opt);
+	while ((opt = getopt(argc, argv, "dF:f:V:v:t:T:r:")) != -1) {
+		if (opt != 'd')
+			has_positive |= islower(opt);
 
 		switch (tolower(opt)) {
 		case 't':