time: Introduce do_sys_settimeofday64()

The do_sys_settimeofday() function uses a timespec, which is not year
2038 safe on 32bit systems.

Thus this patch introduces do_sys_settimeofday64(), which allows us to
transition users of do_sys_settimeofday() to using 64bit time types.

Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
[jstultz: Include errno-base.h to avoid build issue on some arches]
Signed-off-by: John Stultz <john.stultz@linaro.org>

kernel/time/time.c

@@ -160,15 +160,15 @@ static inline void warp_clock(void)
  * various programs will get confused when the clock gets warped.
  */
 
-int do_sys_settimeofday(const struct timespec *tv, const struct timezone *tz)
+int do_sys_settimeofday64(const struct timespec64 *tv, const struct timezone *tz)
 {
 	static int firsttime = 1;
 	int error = 0;
 
-	if (tv && !timespec_valid(tv))
+	if (tv && !timespec64_valid(tv))
 		return -EINVAL;
 
-	error = security_settime(tv, tz);
+	error = security_settime64(tv, tz);
 	if (error)
 		return error;
 
@@ -186,7 +186,7 @@ int do_sys_settimeofday(const struct timespec *tv, const struct timezone *tz)
 		}
 	}
 	if (tv)
-		return do_settimeofday(tv);
+		return do_settimeofday64(tv);
 	return 0;
 }