[tip: timers/urgent] selftests: kselftest: Fix build failure with NOLIBC

[tip-bot2 for Oleg Nesterov]

The following commit has been merged into the timers/urgent branch of tip:

Commit-ID:     16767502aa990cca2cb7d1372b31d328c4c85b40
Gitweb:        https://git.kernel.org/tip/16767502aa990cca2cb7d1372b31d328c4c85b40
Author:        Oleg Nesterov <oleg@xxxxxxxxxx>
AuthorDate:    Fri, 12 Apr 2024 14:35:36 +02:00
Committer:     Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Fri, 12 Apr 2024 16:55:00 +02:00

selftests: kselftest: Fix build failure with NOLIBC

As Mark explains ksft_min_kernel_version() can't be compiled with nolibc,
it doesn't implement uname().

Fixes: 6d029c25b71f ("selftests/timers/posix_timers: Reimplement check_timer_distribution()")
Reported-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240412123536.GA32444@xxxxxxxxxx
Closes: https://lore.kernel.org/all/f0523b3a-ea08-4615-b0fb-5b504a2d39df@xxxxxxxxxxxxx/
---
 tools/testing/selftests/kselftest.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/testing/selftests/kselftest.h b/tools/testing/selftests/kselftest.h
index 0591974..7b89362 100644
--- a/tools/testing/selftests/kselftest.h
+++ b/tools/testing/selftests/kselftest.h
@@ -395,6 +395,10 @@ static inline __noreturn __printf(1, 2) int ksft_exit_skip(const char *msg, ...)
 static inline int ksft_min_kernel_version(unsigned int min_major,
 					  unsigned int min_minor)
 {
+#ifdef NOLIBC
+	ksft_print_msg("NOLIBC: Can't check kernel version: Function not implemented\n");
+	return 0;
+#else
 	unsigned int major, minor;
 	struct utsname info;
 
@@ -402,6 +406,7 @@ static inline int ksft_min_kernel_version(unsigned int min_major,
 		ksft_exit_fail_msg("Can't parse kernel version\n");
 
 	return major > min_major || (major == min_major && minor >= min_minor);
+#endif
 }
 
 #endif /* __KSELFTEST_H */