linux-kernel - [PATCH 11/12] selftests/nolibc: test compatibility of timespec and __kernel

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Message-Id: <20251029-nolibc-uapi-types-v1-11-e79de3b215d8@weissschuh.net>
Date: Wed, 29 Oct 2025 17:03:01 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Willy Tarreau <w@....eu>, Shuah Khan <shuah@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org, 
 linux-kselftest@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH 11/12] selftests/nolibc: test compatibility of timespec and
 __kernel_timespec

Keeping 'struct timespec' and 'struct __kernel_timespec' compatible
allows the source code to stay simple.

Validate that the types stay compatible.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 tools/testing/selftests/nolibc/nolibc-test.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c
index f1d6d6c766dd..938af8d6e2bf 100644
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -1428,6 +1428,23 @@ int test_difftime(void)
 	return 0;
 }
 
+int test_timespec(void)
+{
+	struct __kernel_timespec kts;
+	struct timespec ts;
+
+	if (sizeof(ts) != sizeof(kts))
+		return 1;
+
+	if (!__builtin_types_compatible_p(__typeof__(ts.tv_sec), __typeof__(kts.tv_sec)))
+		return 1;
+
+	if (!__builtin_types_compatible_p(__typeof__(ts.tv_nsec), __typeof__(kts.tv_nsec)))
+		return 1;
+
+	return 0;
+}
+
 int run_stdlib(int min, int max)
 {
 	int test;
@@ -1551,6 +1568,7 @@ int run_stdlib(int min, int max)
 		CASE_TEST(abs);                     EXPECT_EQ(1, abs(-10), 10); break;
 		CASE_TEST(abs_noop);                EXPECT_EQ(1, abs(10), 10); break;
 		CASE_TEST(difftime);                EXPECT_ZR(1, test_difftime()); break;
+		CASE_TEST(test_timespec);           EXPECT_ZR(1, test_timespec()); break;
 
 		case __LINE__:
 			return ret; /* must be last */

-- 
2.51.1.dirty