Date:   Thu, 06 Apr 2023 14:56:29 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Shuah Khan <shuah@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        "Paul E. McKenney" <paulmck@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH 1/2] kselftest: Support nolibc

At present the kselftest header can't be used with nolibc since it makes
use of vprintf() which is not available in nolibc and seems like it would
be inappropriate to implement given the minimal system requirements and
environment intended for nolibc. This has resulted in some open coded
kselftests which use nolibc to test features that are supposed to be
controlled via libc and therefore better exercised in an environment with
no libc.

Rather than continue this let's factor out the I/O routines in kselftest.h
into a separate header file and provide a nolibc implementation which only
allows simple strings to be provided rather than full printf() support.
This is limiting but a great improvement on sharing no code at all.

Signed-off-by: Mark Brown <broonie@...nel.org>
---
 tools/testing/selftests/kselftest-nolibc.h |  93 ++++++++++++++++++
 tools/testing/selftests/kselftest-std.h    | 151 +++++++++++++++++++++++++++++
 tools/testing/selftests/kselftest.h        | 149 +++-------------------------
 3 files changed, 255 insertions(+), 138 deletions(-)

diff --git a/tools/testing/selftests/kselftest-nolibc.h b/tools/testing/selftests/kselftest-nolibc.h
new file mode 100644
index 000000000000..3dea10cc5490
--- /dev/null
+++ b/tools/testing/selftests/kselftest-nolibc.h
@@ -0,0 +1,93 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * kselftest-nolibc	Cut down nolibc based kselftest output functions
+ *
+ * Copyright (c) 2014 Shuah Khan <shuahkh@....samsung.com>
+ * Copyright (c) 2014 Samsung Electronics Co., Ltd.
+ *
+ */
+
+#ifndef __KSELFTEST_H
+#error This file should never be included directly, always include kselftest.h
+#endif
+
+static inline void ksft_print_msg(const char *msg)
+{
+	printf("# %s", msg);
+}
+
+static inline void ksft_test_result_pass(const char *msg)
+{
+	ksft_cnt.ksft_pass++;
+
+	printf("ok %d %s", ksft_test_num(), msg);
+}
+
+static inline void ksft_test_result_fail(const char *msg)
+{
+	ksft_cnt.ksft_fail++;
+
+	printf("not ok %d %s", ksft_test_num(), msg);
+}
+
+/**
+ * ksft_test_result() - Report test success based on truth of condition
+ *
+ * @condition: if true, report test success, otherwise failure.
+ */
+#define ksft_test_result(condition, fmt) do {	\
+	if (!!(condition))				\
+		ksft_test_result_pass(fmt);\
+	else						\
+		ksft_test_result_fail(fmt);\
+	} while (0)
+
+static inline void ksft_test_result_xfail(const char *msg)
+{
+	ksft_cnt.ksft_xfail++;
+
+	printf("ok %d # XFAIL %s", ksft_test_num(), msg);
+}
+
+static inline void ksft_test_result_skip(const char *msg)
+{
+	ksft_cnt.ksft_xskip++;
+
+	printf("ok %d # SKIP %s", ksft_test_num(), msg);
+}
+
+static inline void ksft_test_result_error(const char *msg)
+{
+	ksft_cnt.ksft_error++;
+
+	printf("not ok %d # error %s", ksft_test_num(), msg);
+}
+
+static inline int ksft_exit_fail_msg(const char *msg)
+{
+	printf("Bail out! %s", msg);
+
+	ksft_print_cnts();
+	exit(KSFT_FAIL);
+}
+
+static inline int ksft_exit_skip(const char *msg)
+{
+	/*
+	 * FIXME: several tests misuse ksft_exit_skip so produce
+	 * something sensible if some tests have already been run
+	 * or a plan has been printed.  Those tests should use
+	 * ksft_test_result_skip or ksft_exit_fail_msg instead.
+	 */
+	if (ksft_plan || ksft_test_num()) {
+		ksft_cnt.ksft_xskip++;
+		printf("ok %d # SKIP ", 1 + ksft_test_num());
+	} else {
+		printf("1..0 # SKIP ");
+	}
+	if (msg)
+		printf("%s", msg);
+	if (ksft_test_num())
+		ksft_print_cnts();
+	exit(KSFT_SKIP);
+}
diff --git a/tools/testing/selftests/kselftest-std.h b/tools/testing/selftests/kselftest-std.h
new file mode 100644
index 000000000000..b57c515f6dda
--- /dev/null
+++ b/tools/testing/selftests/kselftest-std.h
@@ -0,0 +1,151 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * kselftest-std.h:	Full stdio based kselftest output functions
+ *
+ * Copyright (c) 2014 Shuah Khan <shuahkh@....samsung.com>
+ * Copyright (c) 2014 Samsung Electronics Co., Ltd.
+ *
+ */
+
+#ifndef __KSELFTEST_H
+#error This file should never be included directly, always include kselftest.h
+#endif
+
+static inline void ksft_print_msg(const char *msg, ...)
+{
+	int saved_errno = errno;
+	va_list args;
+
+	va_start(args, msg);
+	printf("# ");
+	errno = saved_errno;
+	vprintf(msg, args);
+	va_end(args);
+}
+
+static inline void ksft_test_result_pass(const char *msg, ...)
+{
+	int saved_errno = errno;
+	va_list args;
+
+	ksft_cnt.ksft_pass++;
+
+	va_start(args, msg);
+	printf("ok %d ", ksft_test_num());
+	errno = saved_errno;
+	vprintf(msg, args);
+	va_end(args);
+}
+
+static inline void ksft_test_result_fail(const char *msg, ...)
+{
+	int saved_errno = errno;
+	va_list args;
+
+	ksft_cnt.ksft_fail++;
+
+	va_start(args, msg);
+	printf("not ok %d ", ksft_test_num());
+	errno = saved_errno;
+	vprintf(msg, args);
+	va_end(args);
+}
+
+/**
+ * ksft_test_result() - Report test success based on truth of condition
+ *
+ * @condition: if true, report test success, otherwise failure.
+ */
+#define ksft_test_result(condition, fmt, ...) do {	\
+	if (!!(condition))				\
+		ksft_test_result_pass(fmt, ##__VA_ARGS__);\
+	else						\
+		ksft_test_result_fail(fmt, ##__VA_ARGS__);\
+	} while (0)
+
+static inline void ksft_test_result_xfail(const char *msg, ...)
+{
+	int saved_errno = errno;
+	va_list args;
+
+	ksft_cnt.ksft_xfail++;
+
+	va_start(args, msg);
+	printf("ok %d # XFAIL ", ksft_test_num());
+	errno = saved_errno;
+	vprintf(msg, args);
+	va_end(args);
+}
+
+static inline void ksft_test_result_skip(const char *msg, ...)
+{
+	int saved_errno = errno;
+	va_list args;
+
+	ksft_cnt.ksft_xskip++;
+
+	va_start(args, msg);
+	printf("ok %d # SKIP ", ksft_test_num());
+	errno = saved_errno;
+	vprintf(msg, args);
+	va_end(args);
+}
+
+/* TODO: how does "error" differ from "fail" or "skip"? */
+static inline void ksft_test_result_error(const char *msg, ...)
+{
+	int saved_errno = errno;
+	va_list args;
+
+	ksft_cnt.ksft_error++;
+
+	va_start(args, msg);
+	printf("not ok %d # error ", ksft_test_num());
+	errno = saved_errno;
+	vprintf(msg, args);
+	va_end(args);
+}
+
+static inline int ksft_exit_fail_msg(const char *msg, ...)
+{
+	int saved_errno = errno;
+	va_list args;
+
+	va_start(args, msg);
+	printf("Bail out! ");
+	errno = saved_errno;
+	vprintf(msg, args);
+	va_end(args);
+
+	ksft_print_cnts();
+	exit(KSFT_FAIL);
+}
+
+static inline int ksft_exit_skip(const char *msg, ...)
+{
+	int saved_errno = errno;
+	va_list args;
+
+	va_start(args, msg);
+
+	/*
+	 * FIXME: several tests misuse ksft_exit_skip so produce
+	 * something sensible if some tests have already been run
+	 * or a plan has been printed.  Those tests should use
+	 * ksft_test_result_skip or ksft_exit_fail_msg instead.
+	 */
+	if (ksft_plan || ksft_test_num()) {
+		ksft_cnt.ksft_xskip++;
+		printf("ok %d # SKIP ", 1 + ksft_test_num());
+	} else {
+		printf("1..0 # SKIP ");
+	}
+	if (msg) {
+		errno = saved_errno;
+		vprintf(msg, args);
+		va_end(args);
+	}
+	if (ksft_test_num())
+		ksft_print_cnts();
+	exit(KSFT_SKIP);
+}
diff --git a/tools/testing/selftests/kselftest.h b/tools/testing/selftests/kselftest.h
index 33a0dbd26bd3..10fb6f7c4ae2 100644
--- a/tools/testing/selftests/kselftest.h
+++ b/tools/testing/selftests/kselftest.h
@@ -26,6 +26,10 @@
  *     ksft_test_result_xfail(fmt, ...);
  *     ksft_test_result_error(fmt, ...);
  *
+ * If building with nolibc then only a string may be provided, va_args
+ * arre not supported and format characters within the string will not be
+ * interpreted.
+ *
  * When all tests are finished, clean up and exit the program with one of:
  *
  *    ksft_finished();
@@ -43,11 +47,13 @@
 #ifndef __KSELFTEST_H
 #define __KSELFTEST_H
 
+#ifndef NOLIBC
 #include <errno.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <stdarg.h>
 #include <stdio.h>
+#endif
 
 #ifndef ARRAY_SIZE
 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
@@ -132,100 +138,11 @@ static inline void ksft_print_cnts(void)
 		ksft_cnt.ksft_xskip, ksft_cnt.ksft_error);
 }
 
-static inline void ksft_print_msg(const char *msg, ...)
-{
-	int saved_errno = errno;
-	va_list args;
-
-	va_start(args, msg);
-	printf("# ");
-	errno = saved_errno;
-	vprintf(msg, args);
-	va_end(args);
-}
-
-static inline void ksft_test_result_pass(const char *msg, ...)
-{
-	int saved_errno = errno;
-	va_list args;
-
-	ksft_cnt.ksft_pass++;
-
-	va_start(args, msg);
-	printf("ok %d ", ksft_test_num());
-	errno = saved_errno;
-	vprintf(msg, args);
-	va_end(args);
-}
-
-static inline void ksft_test_result_fail(const char *msg, ...)
-{
-	int saved_errno = errno;
-	va_list args;
-
-	ksft_cnt.ksft_fail++;
-
-	va_start(args, msg);
-	printf("not ok %d ", ksft_test_num());
-	errno = saved_errno;
-	vprintf(msg, args);
-	va_end(args);
-}
-
-/**
- * ksft_test_result() - Report test success based on truth of condition
- *
- * @condition: if true, report test success, otherwise failure.
- */
-#define ksft_test_result(condition, fmt, ...) do {	\
-	if (!!(condition))				\
-		ksft_test_result_pass(fmt, ##__VA_ARGS__);\
-	else						\
-		ksft_test_result_fail(fmt, ##__VA_ARGS__);\
-	} while (0)
-
-static inline void ksft_test_result_xfail(const char *msg, ...)
-{
-	int saved_errno = errno;
-	va_list args;
-
-	ksft_cnt.ksft_xfail++;
-
-	va_start(args, msg);
-	printf("ok %d # XFAIL ", ksft_test_num());
-	errno = saved_errno;
-	vprintf(msg, args);
-	va_end(args);
-}
-
-static inline void ksft_test_result_skip(const char *msg, ...)
-{
-	int saved_errno = errno;
-	va_list args;
-
-	ksft_cnt.ksft_xskip++;
-
-	va_start(args, msg);
-	printf("ok %d # SKIP ", ksft_test_num());
-	errno = saved_errno;
-	vprintf(msg, args);
-	va_end(args);
-}
-
-/* TODO: how does "error" differ from "fail" or "skip"? */
-static inline void ksft_test_result_error(const char *msg, ...)
-{
-	int saved_errno = errno;
-	va_list args;
-
-	ksft_cnt.ksft_error++;
-
-	va_start(args, msg);
-	printf("not ok %d # error ", ksft_test_num());
-	errno = saved_errno;
-	vprintf(msg, args);
-	va_end(args);
-}
+#ifdef NOLIBC
+#include "kselftest-nolibc.h"
+#else
+#include "kselftest-std.h"
+#endif
 
 static inline int ksft_exit_pass(void)
 {
@@ -260,21 +177,6 @@ static inline int ksft_exit_fail(void)
 		  ksft_cnt.ksft_xfail +	\
 		  ksft_cnt.ksft_xskip)
 
-static inline int ksft_exit_fail_msg(const char *msg, ...)
-{
-	int saved_errno = errno;
-	va_list args;
-
-	va_start(args, msg);
-	printf("Bail out! ");
-	errno = saved_errno;
-	vprintf(msg, args);
-	va_end(args);
-
-	ksft_print_cnts();
-	exit(KSFT_FAIL);
-}
-
 static inline int ksft_exit_xfail(void)
 {
 	ksft_print_cnts();
@@ -287,33 +189,4 @@ static inline int ksft_exit_xpass(void)
 	exit(KSFT_XPASS);
 }
 
-static inline int ksft_exit_skip(const char *msg, ...)
-{
-	int saved_errno = errno;
-	va_list args;
-
-	va_start(args, msg);
-
-	/*
-	 * FIXME: several tests misuse ksft_exit_skip so produce
-	 * something sensible if some tests have already been run
-	 * or a plan has been printed.  Those tests should use
-	 * ksft_test_result_skip or ksft_exit_fail_msg instead.
-	 */
-	if (ksft_plan || ksft_test_num()) {
-		ksft_cnt.ksft_xskip++;
-		printf("ok %d # SKIP ", 1 + ksft_test_num());
-	} else {
-		printf("1..0 # SKIP ");
-	}
-	if (msg) {
-		errno = saved_errno;
-		vprintf(msg, args);
-		va_end(args);
-	}
-	if (ksft_test_num())
-		ksft_print_cnts();
-	exit(KSFT_SKIP);
-}
-
 #endif /* __KSELFTEST_H */

-- 
2.30.2

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