selftests: timers: Partially revert "Remove local NSEC_PER_SEC and USEC_PER_SEC defines"

This partially reverts commit 80fa614e2f ("selftests: timers: Remove
local NSEC_PER_SEC and USEC_PER_SEC defines").

The original commit removed local definitions of NSEC_PER_SEC and
USEC_PER_SEC in favor of including <include/vdso/time64.h>. However,
NSEC_PER_SEC in vdso/time64.h is defined as 1000000000L, which is
32-bit on 32-bit architectures. This causes integer overflow warnings
in several timer tests when doing arithmetic like NSEC_PER_SEC * 10 on
32-bit systems.

To fix this, restore the local definitions of NSEC_PER_SEC and
USEC_PER_SEC in the test files, but use "LL" suffix consistently
(1000000000LL and 1000000LL) to ensure 64-bit arithmetic and avoid
overflows.

We keep the cleanup from the original commit that renamed plural
definitions (NSECS_PER_SEC/USECS_PER_SEC) to singular ones in
posix_timers.c, but we now define them locally there as well.
This also removes the dependency of the selftests on the internal
kernel header <include/vdso/time64.h>.

Signed-off-by: Wake Liu <wakel@google.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Acked-by: John Stultz <jstultz@google.com>
Link: https://patch.msgid.link/20260610014721.718362-1-wakel@google.com

tools/testing/selftests/timers/Makefile

@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
-CFLAGS += -O3 -Wl,-no-as-needed -Wall -I $(top_srcdir)
+CFLAGS += -O3 -Wl,-no-as-needed -Wall
 LDLIBS += -lrt -lpthread -lm
 
 # these are all "safe" tests that don't modify

tools/testing/selftests/timers/adjtick.c

@@ -22,10 +22,11 @@
 #include <sys/time.h>
 #include <sys/timex.h>
 #include <time.h>
-#include <include/vdso/time64.h>
-
 #include "kselftest.h"
 
+#define NSEC_PER_SEC		1000000000LL
+#define USEC_PER_SEC		1000000LL
+
 #define MILLION			1000000
 
 long systick;

tools/testing/selftests/timers/alarmtimer-suspend.c

@@ -28,10 +28,11 @@
 #include <signal.h>
 #include <stdlib.h>
 #include <pthread.h>
-#include <include/vdso/time64.h>
 #include <errno.h>
 #include "kselftest.h"
 
+#define NSEC_PER_SEC 1000000000LL
+
 #define UNREASONABLE_LAT (NSEC_PER_SEC * 5) /* hopefully we resume in 5 secs */
 
 #define SUSPEND_SECS 15

tools/testing/selftests/timers/inconsistency-check.c

@@ -28,9 +28,10 @@
 #include <sys/timex.h>
 #include <string.h>
 #include <signal.h>
-#include <include/vdso/time64.h>
 #include "kselftest.h"
 
+#define NSEC_PER_SEC 1000000000LL
+
 /* CLOCK_HWSPECIFIC == CLOCK_SGI_CYCLE (Deprecated) */
 #define CLOCK_HWSPECIFIC		10
 

tools/testing/selftests/timers/leap-a-day.c

@@ -51,9 +51,10 @@
 #include <string.h>
 #include <signal.h>
 #include <unistd.h>
-#include <include/vdso/time64.h>
 #include "kselftest.h"
 
+#define NSEC_PER_SEC 1000000000LL
+
 #define CLOCK_TAI 11
 
 time_t next_leap;

tools/testing/selftests/timers/mqueue-lat.c

@@ -29,9 +29,10 @@
 #include <signal.h>
 #include <errno.h>
 #include <mqueue.h>
-#include <include/vdso/time64.h>
 #include "kselftest.h"
 
+#define NSEC_PER_SEC 1000000000LL
+
 
 #define TARGET_TIMEOUT		100000000	/* 100ms in nanoseconds */
 #define UNRESONABLE_LATENCY	40000000	/* 40ms in nanosecs */

tools/testing/selftests/timers/nanosleep.c

@@ -27,9 +27,10 @@
 #include <sys/timex.h>
 #include <string.h>
 #include <signal.h>
-#include <include/vdso/time64.h>
 #include "kselftest.h"
 
+#define NSEC_PER_SEC 1000000000LL
+
 /* CLOCK_HWSPECIFIC == CLOCK_SGI_CYCLE (Deprecated) */
 #define CLOCK_HWSPECIFIC		10
 

tools/testing/selftests/timers/nsleep-lat.c

@@ -24,9 +24,10 @@
 #include <sys/timex.h>
 #include <string.h>
 #include <signal.h>
-#include <include/vdso/time64.h>
 #include "kselftest.h"
 
+#define NSEC_PER_SEC 1000000000LL
+
 #define UNRESONABLE_LATENCY 40000000 /* 40ms in nanosecs */
 
 /* CLOCK_HWSPECIFIC == CLOCK_SGI_CYCLE (Deprecated) */

tools/testing/selftests/timers/posix_timers.c

@@ -16,12 +16,14 @@
 #include <string.h>
 #include <unistd.h>
 #include <time.h>
-#include <include/vdso/time64.h>
 #include <pthread.h>
 #include <stdbool.h>
 
 #include "kselftest.h"
 
+#define NSEC_PER_SEC 1000000000LL
+#define USEC_PER_SEC 1000000LL
+
 #define DELAY 2
 
 static void __fatal_error(const char *test, const char *name, const char *what)

tools/testing/selftests/timers/raw_skew.c

@@ -25,9 +25,10 @@
 #include <sys/time.h>
 #include <sys/timex.h>
 #include <time.h>
-#include <include/vdso/time64.h>
 #include "kselftest.h"
 
+#define NSEC_PER_SEC 1000000000LL
+
 #define shift_right(x, s) ({		\
 	__typeof__(x) __x = (x);	\
 	__typeof__(s) __s = (s);	\

tools/testing/selftests/timers/set-2038.c

@@ -27,9 +27,10 @@
 #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)
 

tools/testing/selftests/timers/set-timer-lat.c

@@ -28,9 +28,10 @@
 #include <signal.h>
 #include <stdlib.h>
 #include <pthread.h>
-#include <include/vdso/time64.h>
 #include "kselftest.h"
 
+#define NSEC_PER_SEC 1000000000LL
+
 /* CLOCK_HWSPECIFIC == CLOCK_SGI_CYCLE (Deprecated) */
 #define CLOCK_HWSPECIFIC		10
 

tools/testing/selftests/timers/valid-adjtimex.c

@@ -29,9 +29,11 @@
 #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>