s390/time: Use monotonic clock in get_cycles()

Otherwise the code might not work correctly when the clock
is changed.

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

Author: svens-s390

arch/s390/include/asm/timex.h

@@ -196,13 +196,6 @@ static inline unsigned long get_tod_clock_fast(void)
 	asm volatile("stckf %0" : "=Q" (clk) : : "cc");
 	return clk;
 }
-
-static inline cycles_t get_cycles(void)
-{
-	return (cycles_t) get_tod_clock() >> 2;
-}
-#define get_cycles get_cycles
-
 int get_phys_clock(unsigned long *clock);
 void init_cpu_timer(void);
 
@@ -230,6 +223,12 @@ static inline unsigned long get_tod_clock_monotonic(void)
 	return tod;
 }
 
+static inline cycles_t get_cycles(void)
+{
+	return (cycles_t)get_tod_clock_monotonic() >> 2;
+}
+#define get_cycles get_cycles
+
 /**
  * tod_to_ns - convert a TOD format value to nanoseconds
  * @todval: to be converted TOD format value