diff --git a/tools/testing/selftests/timers/Makefile b/tools/testing/selftests/timers/Makefile
index 0e73a16874c4..32203593c62e 100644
--- a/tools/testing/selftests/timers/Makefile
+++ b/tools/testing/selftests/timers/Makefile
@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
-CFLAGS += -O3 -Wl,-no-as-needed -Wall
+CFLAGS += -O3 -Wl,-no-as-needed -Wall -I $(top_srcdir)
 LDLIBS += -lrt -lpthread -lm
 
 # these are all "safe" tests that don't modify
diff --git a/tools/testing/selftests/timers/adjtick.c b/tools/testing/selftests/timers/adjtick.c
index 205b76a4abb4..cb9a30f54662 100644
--- a/tools/testing/selftests/timers/adjtick.c
+++ b/tools/testing/selftests/timers/adjtick.c
@@ -22,14 +22,12 @@
 #include <sys/time.h>
 #include <sys/timex.h>
 #include <time.h>
+#include <include/vdso/time64.h>
 
 #include "../kselftest.h"
 
 #define CLOCK_MONOTONIC_RAW	4
 
-#define NSEC_PER_SEC		1000000000LL
-#define USEC_PER_SEC		1000000
-
 #define MILLION			1000000
 
 long systick;
diff --git a/tools/testing/selftests/timers/alarmtimer-suspend.c b/tools/testing/selftests/timers/alarmtimer-suspend.c
index ad52e608b88e..62da2a3f949e 100644
--- a/tools/testing/selftests/timers/alarmtimer-suspend.c
+++ b/tools/testing/selftests/timers/alarmtimer-suspend.c
@@ -28,6 +28,7 @@
 #include <signal.h>
 #include <stdlib.h>
 #include <pthread.h>
+#include <include/vdso/time64.h>
 #include "../kselftest.h"
 
 #define CLOCK_REALTIME			0
@@ -45,7 +46,6 @@
 #define NR_CLOCKIDS			12
 
 
-#define NSEC_PER_SEC 1000000000ULL
 #define UNREASONABLE_LAT (NSEC_PER_SEC * 5) /* hopefully we resume in 5 secs */
 
 #define SUSPEND_SECS 15
diff --git a/tools/testing/selftests/timers/inconsistency-check.c b/tools/testing/selftests/timers/inconsistency-check.c
index 36a49fba6c9b..75650cf0503f 100644
--- a/tools/testing/selftests/timers/inconsistency-check.c
+++ b/tools/testing/selftests/timers/inconsistency-check.c
@@ -28,10 +28,10 @@
 #include <sys/timex.h>
 #include <string.h>
 #include <signal.h>
+#include <include/vdso/time64.h>
 #include "../kselftest.h"
 
 #define CALLS_PER_LOOP 64
-#define NSEC_PER_SEC 1000000000ULL
 
 #define CLOCK_REALTIME			0
 #define CLOCK_MONOTONIC			1
diff --git a/tools/testing/selftests/timers/leap-a-day.c b/tools/testing/selftests/timers/leap-a-day.c
index 986abbdb1521..04004a7c0934 100644
--- a/tools/testing/selftests/timers/leap-a-day.c
+++ b/tools/testing/selftests/timers/leap-a-day.c
@@ -48,9 +48,9 @@
 #include <string.h>
 #include <signal.h>
 #include <unistd.h>
+#include <include/vdso/time64.h>
 #include "../kselftest.h"
 
-#define NSEC_PER_SEC 1000000000ULL
 #define CLOCK_TAI 11
 
 time_t next_leap;
diff --git a/tools/testing/selftests/timers/mqueue-lat.c b/tools/testing/selftests/timers/mqueue-lat.c
index f3179a605bba..63de2334a291 100644
--- a/tools/testing/selftests/timers/mqueue-lat.c
+++ b/tools/testing/selftests/timers/mqueue-lat.c
@@ -29,9 +29,9 @@
 #include <signal.h>
 #include <errno.h>
 #include <mqueue.h>
+#include <include/vdso/time64.h>
 #include "../kselftest.h"
 
-#define NSEC_PER_SEC 1000000000ULL
 
 #define TARGET_TIMEOUT		100000000	/* 100ms in nanoseconds */
 #define UNRESONABLE_LATENCY	40000000	/* 40ms in nanosecs */
diff --git a/tools/testing/selftests/timers/nanosleep.c b/tools/testing/selftests/timers/nanosleep.c
index df1d03516e7b..9a354e38a569 100644
--- a/tools/testing/selftests/timers/nanosleep.c
+++ b/tools/testing/selftests/timers/nanosleep.c
@@ -27,10 +27,9 @@
 #include <sys/timex.h>
 #include <string.h>
 #include <signal.h>
+#include <include/vdso/time64.h>
 #include "../kselftest.h"
 
-#define NSEC_PER_SEC 1000000000ULL
-
 #define CLOCK_REALTIME			0
 #define CLOCK_MONOTONIC			1
 #define CLOCK_PROCESS_CPUTIME_ID	2
diff --git a/tools/testing/selftests/timers/posix_timers.c b/tools/testing/selftests/timers/posix_timers.c
index ddb1cebc844e..9814b3a1c77d 100644
--- a/tools/testing/selftests/timers/posix_timers.c
+++ b/tools/testing/selftests/timers/posix_timers.c
@@ -15,13 +15,12 @@
 #include <string.h>
 #include <unistd.h>
 #include <time.h>
+#include <include/vdso/time64.h>
 #include <pthread.h>
 
 #include "../kselftest.h"
 
 #define DELAY 2
-#define USECS_PER_SEC 1000000
-#define NSECS_PER_SEC 1000000000
 
 static void __fatal_error(const char *test, const char *name, const char *what)
 {
@@ -86,9 +85,9 @@ static int check_diff(struct timeval start, struct timeval end)
 	long long diff;
 
 	diff = end.tv_usec - start.tv_usec;
-	diff += (end.tv_sec - start.tv_sec) * USECS_PER_SEC;
+	diff += (end.tv_sec - start.tv_sec) * USEC_PER_SEC;
 
-	if (llabs(diff - DELAY * USECS_PER_SEC) > USECS_PER_SEC / 2) {
+	if (llabs(diff - DELAY * USEC_PER_SEC) > USEC_PER_SEC / 2) {
 		printf("Diff too high: %lld..", diff);
 		return -1;
 	}
@@ -448,7 +447,7 @@ static inline int64_t calcdiff_ns(struct timespec t1, struct timespec t2)
 {
 	int64_t diff;
 
-	diff = NSECS_PER_SEC * (int64_t)((int) t1.tv_sec - (int) t2.tv_sec);
+	diff = NSEC_PER_SEC * (int64_t)((int) t1.tv_sec - (int) t2.tv_sec);
 	diff += ((int) t1.tv_nsec - (int) t2.tv_nsec);
 	return diff;
 }
@@ -479,7 +478,7 @@ static void check_sigev_none(int which, const char *name)
 	do {
 		if (clock_gettime(which, &now))
 			fatal_error(name, "clock_gettime()");
-	} while (calcdiff_ns(now, start) < NSECS_PER_SEC);
+	} while (calcdiff_ns(now, start) < NSEC_PER_SEC);
 
 	if (timer_gettime(timerid, &its))
 		fatal_error(name, "timer_gettime()");
@@ -536,7 +535,7 @@ static void check_gettime(int which, const char *name)
 			wraps++;
 		prev = its;
 
-	} while (calcdiff_ns(now, start) < NSECS_PER_SEC);
+	} while (calcdiff_ns(now, start) < NSEC_PER_SEC);
 
 	if (timer_delete(timerid))
 		fatal_error(name, "timer_delete()");
@@ -587,7 +586,7 @@ static void check_overrun(int which, const char *name)
 	do {
 		if (clock_gettime(which, &now))
 			fatal_error(name, "clock_gettime()");
-	} while (calcdiff_ns(now, start) < NSECS_PER_SEC);
+	} while (calcdiff_ns(now, start) < NSEC_PER_SEC);
 
 	/* Unblock it, which should deliver a signal */
 	if (sigprocmask(SIG_UNBLOCK, &set, NULL))
diff --git a/tools/testing/selftests/timers/raw_skew.c b/tools/testing/selftests/timers/raw_skew.c
index 030143eb09b4..ea50e4efc422 100644
--- a/tools/testing/selftests/timers/raw_skew.c
+++ b/tools/testing/selftests/timers/raw_skew.c
@@ -25,10 +25,10 @@
 #include <sys/time.h>
 #include <sys/timex.h>
 #include <time.h>
+#include <include/vdso/time64.h>
 #include "../kselftest.h"
 
 #define CLOCK_MONOTONIC_RAW		4
-#define NSEC_PER_SEC 1000000000LL
 
 #define shift_right(x, s) ({		\
 	__typeof__(x) __x = (x);	\
diff --git a/tools/testing/selftests/timers/set-2038.c b/tools/testing/selftests/timers/set-2038.c
index f7d978721b9e..ed244315e11c 100644
--- a/tools/testing/selftests/timers/set-2038.c
+++ b/tools/testing/selftests/timers/set-2038.c
@@ -27,10 +27,9 @@
 #include <unistd.h>
 #include <time.h>
 #include <sys/time.h>
+#include <include/vdso/time64.h>
 #include "../kselftest.h"
 
-#define NSEC_PER_SEC 1000000000LL
-
 #define KTIME_MAX	((long long)~((unsigned long long)1 << 63))
 #define KTIME_SEC_MAX	(KTIME_MAX / NSEC_PER_SEC)
 
diff --git a/tools/testing/selftests/timers/set-timer-lat.c b/tools/testing/selftests/timers/set-timer-lat.c
index 7ce240c89b21..5365e9ae61c3 100644
--- a/tools/testing/selftests/timers/set-timer-lat.c
+++ b/tools/testing/selftests/timers/set-timer-lat.c
@@ -28,6 +28,7 @@
 #include <signal.h>
 #include <stdlib.h>
 #include <pthread.h>
+#include <include/vdso/time64.h>
 #include "../kselftest.h"
 
 #define CLOCK_REALTIME			0
@@ -44,8 +45,6 @@
 #define CLOCK_TAI			11
 #define NR_CLOCKIDS			12
 
-
-#define NSEC_PER_SEC 1000000000ULL
 #define UNRESONABLE_LATENCY 40000000 /* 40ms in nanosecs */
 
 #define TIMER_SECS 1
diff --git a/tools/testing/selftests/timers/valid-adjtimex.c b/tools/testing/selftests/timers/valid-adjtimex.c
index d500884801d8..6b7801055ad1 100644
--- a/tools/testing/selftests/timers/valid-adjtimex.c
+++ b/tools/testing/selftests/timers/valid-adjtimex.c
@@ -29,11 +29,9 @@
 #include <string.h>
 #include <signal.h>
 #include <unistd.h>
+#include <include/vdso/time64.h>
 #include "../kselftest.h"
 
-#define NSEC_PER_SEC 1000000000LL
-#define USEC_PER_SEC 1000000LL
-
 #define ADJ_SETOFFSET 0x0100
 
 #include <sys/syscall.h>
