--- zzzz-none-000/linux-3.10.107/drivers/char/hangcheck-timer.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/char/hangcheck-timer.c	2021-02-04 17:41:59.000000000 +0000
@@ -49,7 +49,7 @@
 #include <asm/uaccess.h>
 #include <linux/sysrq.h>
 #include <linux/timer.h>
-#include <linux/time.h>
+#include <linux/hrtimer.h>
 
 #define VERSION_STR "0.9.1"
 
@@ -117,24 +117,7 @@
 __setup("hcheck_dump_tasks", hangcheck_parse_dump_tasks);
 #endif /* not MODULE */
 
-#if defined(CONFIG_S390)
-# define HAVE_MONOTONIC
-# define TIMER_FREQ 1000000000ULL
-#else
-# define TIMER_FREQ 1000000000ULL
-#endif
-
-#ifdef HAVE_MONOTONIC
-extern unsigned long long monotonic_clock(void);
-#else
-static inline unsigned long long monotonic_clock(void)
-{
-	struct timespec ts;
-	getrawmonotonic(&ts);
-	return timespec_to_ns(&ts);
-}
-#endif  /* HAVE_MONOTONIC */
-
+#define TIMER_FREQ 1000000000ULL
 
 /* Last time scheduled */
 static unsigned long long hangcheck_tsc, hangcheck_tsc_margin;
@@ -143,12 +126,11 @@
 
 static DEFINE_TIMER(hangcheck_ticktock, hangcheck_fire, 0, 0);
 
-
 static void hangcheck_fire(unsigned long data)
 {
 	unsigned long long cur_tsc, tsc_diff;
 
-	cur_tsc = monotonic_clock();
+	cur_tsc = ktime_get_ns();
 
 	if (cur_tsc > hangcheck_tsc)
 		tsc_diff = cur_tsc - hangcheck_tsc;
@@ -177,7 +159,7 @@
 			tsc_diff, tsc_diff - hangcheck_tick*TIMER_FREQ);
 #endif
 	mod_timer(&hangcheck_ticktock, jiffies + (hangcheck_tick*HZ));
-	hangcheck_tsc = monotonic_clock();
+	hangcheck_tsc = ktime_get_ns();
 }
 
 
@@ -185,16 +167,11 @@
 {
 	printk("Hangcheck: starting hangcheck timer %s (tick is %d seconds, margin is %d seconds).\n",
 	       VERSION_STR, hangcheck_tick, hangcheck_margin);
-#if defined (HAVE_MONOTONIC)
-	printk("Hangcheck: Using monotonic_clock().\n");
-#else
-	printk("Hangcheck: Using getrawmonotonic().\n");
-#endif  /* HAVE_MONOTONIC */
 	hangcheck_tsc_margin =
-		(unsigned long long)(hangcheck_margin + hangcheck_tick);
-	hangcheck_tsc_margin *= (unsigned long long)TIMER_FREQ;
+		(unsigned long long)hangcheck_margin + hangcheck_tick;
+	hangcheck_tsc_margin *= TIMER_FREQ;
 
-	hangcheck_tsc = monotonic_clock();
+	hangcheck_tsc = ktime_get_ns();
 	mod_timer(&hangcheck_ticktock, jiffies + (hangcheck_tick*HZ));
 
 	return 0;