firewire: use 64-bit time_t based interfaces

32-bit CLOCK_REALTIME timestamps overflow in year 2038, so all such
interfaces are deprecated now.  For the FW_CDEV_IOC_GET_CYCLE_TIMER2
ioctl, we already support 64-bit timestamps, but the implementation
still uses timespec.

This changes the code to use timespec64 instead with the appropriate
accessor functions.

Link: http://lkml.kernel.org/r/20180711124456.1023039-1-arnd@arndb.de
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/firewire/core-cdev.c

@@ -1205,7 +1205,7 @@ static int ioctl_get_cycle_timer2(struct client *client, union ioctl_arg *arg)
 {
 	struct fw_cdev_get_cycle_timer2 *a = &arg->get_cycle_timer2;
 	struct fw_card *card = client->device->card;
-	struct timespec ts = {0, 0};
+	struct timespec64 ts = {0, 0};
 	u32 cycle_time;
 	int ret = 0;
 
@@ -1214,9 +1214,9 @@ static int ioctl_get_cycle_timer2(struct client *client, union ioctl_arg *arg)
 	cycle_time = card->driver->read_csr(card, CSR_CYCLE_TIME);
 
 	switch (a->clk_id) {
-	case CLOCK_REALTIME:      getnstimeofday(&ts);	break;
-	case CLOCK_MONOTONIC:     ktime_get_ts(&ts);	break;
-	case CLOCK_MONOTONIC_RAW: getrawmonotonic(&ts);	break;
+	case CLOCK_REALTIME:      ktime_get_real_ts64(&ts);	break;
+	case CLOCK_MONOTONIC:     ktime_get_ts64(&ts);		break;
+	case CLOCK_MONOTONIC_RAW: ktime_get_raw_ts64(&ts);	break;
 	default:
 		ret = -EINVAL;
 	}