diff -ur dahdi-linux-3.1.0/drivers/dahdi/xpp/xbus-core.c dahdi-linux-3.1.0-math64/drivers/dahdi/xpp/xbus-core.c
--- dahdi-linux-3.1.0/drivers/dahdi/xpp/xbus-core.c	2019-10-03 16:48:09.000000000 +0200
+++ dahdi-linux-3.1.0-math64/drivers/dahdi/xpp/xbus-core.c	2019-12-01 15:42:12.261848789 +0100
@@ -25,6 +25,7 @@
 #include <linux/errno.h>
 #include <linux/sched.h>
 #include <linux/mutex.h>
+#include <linux/math64.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/slab.h>
@@ -1754,11 +1755,13 @@
 
 static void xbus_fill_proc_queue(struct seq_file *sfile, struct xframe_queue *q)
 {
+	s32 rem;
+	s64 lag_sec = div_s64_rem(q->worst_lag_usec, 1000, &rem);
 	seq_printf(sfile,
-		"%-15s: counts %3d, %3d, %3d worst %3d, overflows %3d worst_lag %02lld.%lld ms\n",
+		"%-15s: counts %3d, %3d, %3d worst %3d, overflows %3d worst_lag %02lld.%ld ms\n",
 		q->name, q->steady_state_count, q->count, q->max_count,
-		q->worst_count, q->overflows, q->worst_lag_usec / 1000,
-		q->worst_lag_usec % 1000);
+		q->worst_count, q->overflows, lag_sec,
+		rem);
 	xframe_queue_clearstats(q);
 }
 
diff -ur dahdi-linux-3.1.0/drivers/dahdi/xpp/xbus-pcm.c dahdi-linux-3.1.0-math64/drivers/dahdi/xpp/xbus-pcm.c
--- dahdi-linux-3.1.0/drivers/dahdi/xpp/xbus-pcm.c	2019-10-03 16:48:09.000000000 +0200
+++ dahdi-linux-3.1.0-math64/drivers/dahdi/xpp/xbus-pcm.c	2019-12-01 16:32:23.696492708 +0100
@@ -22,6 +22,7 @@
 #include <linux/version.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/math64.h>
 #include "xbus-pcm.h"
 #include "xbus-core.h"
 #include "xpp_dahdi.h"
@@ -129,7 +130,7 @@
 		usec = ktime_us_delta(ticker->last_sample,
 					ticker->first_sample);
 		ticker->first_sample = ticker->last_sample;
-		ticker->tick_period = usec / ticker->cycle;
+		ticker->tick_period = div_s64(usec, ticker->cycle);
 		cycled = 1;
 	}
 	ticker->count++;
@@ -497,7 +498,7 @@
 	XBUS_DBG(SYNC, xbus,
 		 "%sDRIFT adjust %s (%d) (last update %lld seconds ago)\n",
 		 (disable_pll_sync) ? "Fake " : "", msg, drift,
-		 msec_delta / MSEC_PER_SEC);
+		 div_s64(msec_delta, MSEC_PER_SEC));
 	if (!disable_pll_sync)
 		CALL_PROTO(GLOBAL, SYNC_SOURCE, xbus, NULL, SYNC_MODE_PLL,
 			   drift);
diff -ur dahdi-linux-3.1.0/drivers/dahdi/xpp/xbus-sysfs.c dahdi-linux-3.1.0-math64/drivers/dahdi/xpp/xbus-sysfs.c
--- dahdi-linux-3.1.0/drivers/dahdi/xpp/xbus-sysfs.c	2019-10-03 16:48:09.000000000 +0200
+++ dahdi-linux-3.1.0-math64/drivers/dahdi/xpp/xbus-sysfs.c	2019-12-01 16:29:26.289062748 +0100
@@ -23,6 +23,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/errno.h>
+#include <linux/math64.h>
 #include <linux/proc_fs.h>
 #ifdef	PROTOCOL_DEBUG
 #include <linux/ctype.h>
@@ -249,11 +250,9 @@
 	/*
 	 * Calculate lost ticks time
 	 */
-	seconds = ktime_ms_delta(now, di->last_lost_tick) / 1000;
-	minutes = seconds / 60;
-	seconds = seconds % 60;
-	hours = minutes / 60;
-	minutes = minutes % 60;
+	seconds = div_s64(ktime_ms_delta(now, di->last_lost_tick), 1000);
+	minutes = div_s64_rem(seconds, 60, &seconds);
+	hours = div_s64_rem(minutes, 60, &minutes);
 	len += snprintf(buf + len, PAGE_SIZE - len,
 		"%-15s: %8d (was %d:%02d:%02d ago)\n", "lost_ticks",
 		di->lost_ticks, hours, minutes, seconds);
diff -ur dahdi-linux-3.1.0/drivers/dahdi/xpp/xframe_queue.c dahdi-linux-3.1.0-math64/drivers/dahdi/xpp/xframe_queue.c
--- dahdi-linux-3.1.0/drivers/dahdi/xpp/xframe_queue.c	2019-10-03 16:48:09.000000000 +0200
+++ dahdi-linux-3.1.0-math64/drivers/dahdi/xpp/xframe_queue.c	2019-12-01 15:46:21.663845498 +0100
@@ -1,3 +1,4 @@
+#include <linux/math64.h>
 #include "xframe_queue.h"
 #include "xbus-core.h"
 #include "dahdi_debug.h"
@@ -40,10 +41,11 @@
 	       THIS_MODULE->name, q->name);
 	list_for_each_entry_reverse(xframe, &q->head, frame_list) {
 		xpacket_t *pack = (xpacket_t *)&xframe->packets[0];
-		s64 usec = ktime_us_delta(now, xframe->kt_queued);
+		s32 rem;
+		s64 sec = div_s64_rem(ktime_us_delta(now, xframe->kt_queued), 1000, &rem);
 
-		snprintf(prefix, ARRAY_SIZE(prefix), "  %3d> %5lld.%03lld msec",
-			 i++, usec / 1000, usec % 1000);
+		snprintf(prefix, ARRAY_SIZE(prefix), "  %3d> %5lld.%03ld msec",
+			 i++, sec, rem);
 		dump_packet(prefix, pack, 1);
 	}
 }
@@ -60,11 +62,13 @@
 	if (q->count >= q->max_count) {
 		q->overflows++;
 		if ((overflow_cnt++ % 1000) < 5) {
-			NOTICE("Overflow of %-15s: counts %3d, %3d, %3d worst %3d, overflows %3d worst_lag %02lld.%lld ms\n",
+			s32 rem;
+			s64 lag_sec = div_s64_rem(q->worst_lag_usec, 1000, &rem);
+			NOTICE("Overflow of %-15s: counts %3d, %3d, %3d worst %3d, overflows %3d worst_lag %02lld.%ld ms\n",
 			     q->name, q->steady_state_count, q->count,
 			     q->max_count, q->worst_count, q->overflows,
-			     q->worst_lag_usec / 1000,
-			     q->worst_lag_usec % 1000);
+			     lag_sec,
+			     rem);
 			__xframe_dump_queue(q);
 		}
 		ret = 0;
diff -ur dahdi-linux-3.1.0/drivers/dahdi/xpp/xpp_usb.c dahdi-linux-3.1.0-math64/drivers/dahdi/xpp/xpp_usb.c
--- dahdi-linux-3.1.0/drivers/dahdi/xpp/xpp_usb.c	2019-10-03 16:48:09.000000000 +0200
+++ dahdi-linux-3.1.0-math64/drivers/dahdi/xpp/xpp_usb.c	2019-12-01 16:34:50.324899402 +0100
@@ -27,6 +27,7 @@
 #include <linux/interrupt.h>
 #include <linux/delay.h>	/* for udelay */
 #include <linux/seq_file.h>
+#include <linux/math64.h>
 #include <asm/uaccess.h>
 #include <asm/atomic.h>
 #include <asm/timex.h>
@@ -882,7 +883,7 @@
 		usec = 0; /* System clock jumped */
 	if (usec > xusb->max_tx_delay)
 		xusb->max_tx_delay = usec;
-	i = usec / USEC_BUCKET;
+	i = div_s64(usec, USEC_BUCKET);
 	if (i >= NUM_BUCKETS)
 		i = NUM_BUCKETS - 1;
 	xusb->usb_tx_delay[i]++;