staging/lustre: use 64-bit ibn_incarnation computation

ibn_incarnation is a 64-bit value, but using timeval to compute
it will cause an overflow in 2038. This changes it to use
ktime_get_real_ts64() instead.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c

@@ -2749,7 +2749,7 @@ int kiblnd_startup(lnet_ni_t *ni)
 	char *ifname;
 	kib_dev_t *ibdev = NULL;
 	kib_net_t *net;
-	struct timeval tv;
+	struct timespec64 tv;
 	unsigned long flags;
 	int rc;
 	int newdev;
@@ -2767,8 +2767,9 @@ int kiblnd_startup(lnet_ni_t *ni)
 	if (net == NULL)
 		goto net_failed;
 
-	do_gettimeofday(&tv);
-	net->ibn_incarnation = (((__u64)tv.tv_sec) * 1000000) + tv.tv_usec;
+	ktime_get_real_ts64(&tv);
+	net->ibn_incarnation = tv.tv_sec * USEC_PER_SEC +
+			       tv.tv_nsec / NSEC_PER_USEC;
 
 	ni->ni_peertimeout    = *kiblnd_tunables.kib_peertimeout;
 	ni->ni_maxtxcredits   = *kiblnd_tunables.kib_credits;