staging/lustre: use 64-bit timestamps for selftest

The wire protocol for the ping uses a 64-bit seconds/microseconds
pair, but this won't work when one side uses a 32-bit timeval
to look up the current time beyond 2038.

This changes the code to use ktime_get_real_ts64() to create
a timestamp that has the right format on all machines.
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/selftest/ping_test.c

@@ -92,7 +92,7 @@ ping_client_prep_rpc(sfw_test_unit_t *tsu,
 	srpc_ping_reqst_t *req;
 	sfw_test_instance_t *tsi = tsu->tsu_instance;
 	sfw_session_t *sn = tsi->tsi_batch->bat_session;
-	struct timeval tv;
+	struct timespec64 ts;
 	int rc;
 
 	LASSERT(sn != NULL);
@@ -110,9 +110,9 @@ ping_client_prep_rpc(sfw_test_unit_t *tsu,
 	req->pnr_seq = lst_ping_data.pnd_counter++;
 	spin_unlock(&lst_ping_data.pnd_lock);
 
-	cfs_fs_timeval(&tv);
-	req->pnr_time_sec  = tv.tv_sec;
-	req->pnr_time_usec = tv.tv_usec;
+	ktime_get_real_ts64(&ts);
+	req->pnr_time_sec  = ts.tv_sec;
+	req->pnr_time_usec = ts.tv_nsec / NSEC_PER_USEC;
 
 	return rc;
 }
@@ -124,7 +124,7 @@ ping_client_done_rpc(sfw_test_unit_t *tsu, srpc_client_rpc_t *rpc)
 	sfw_session_t *sn = tsi->tsi_batch->bat_session;
 	srpc_ping_reqst_t *reqst = &rpc->crpc_reqstmsg.msg_body.ping_reqst;
 	srpc_ping_reply_t *reply = &rpc->crpc_replymsg.msg_body.ping_reply;
-	struct timeval tv;
+	struct timespec64 ts;
 
 	LASSERT(sn != NULL);
 
@@ -161,10 +161,10 @@ ping_client_done_rpc(sfw_test_unit_t *tsu, srpc_client_rpc_t *rpc)
 		return;
 	}
 
-	cfs_fs_timeval(&tv);
+	ktime_get_real_ts64(&ts);
 	CDEBUG(D_NET, "%d reply in %u usec\n", reply->pnr_seq,
-		(unsigned)((tv.tv_sec - (unsigned)reqst->pnr_time_sec) * 1000000
-			   + (tv.tv_usec - reqst->pnr_time_usec)));
+	       (unsigned)((ts.tv_sec - reqst->pnr_time_sec) * 1000000 +
+			  (ts.tv_nsec / NSEC_PER_USEC - reqst->pnr_time_usec)));
 	return;
 }