[S390] time: let local_tick_enable/disable() reprogram the clock comparator

Let local_tick_enable/disable() reprogram the clock comparator so the
function names make semantically more sense.
Also that way the functions are more symmetric since normally each
local_tick_enable() call usually would have a subsequent call to
set_clock_comparator() anyway.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/include/asm/timex.h

@@ -59,12 +59,14 @@ static inline unsigned long long local_tick_disable(void)
 
 	old = S390_lowcore.clock_comparator;
 	S390_lowcore.clock_comparator = -1ULL;
+	set_clock_comparator(S390_lowcore.clock_comparator);
 	return old;
 }
 
 static inline void local_tick_enable(unsigned long long comp)
 {
 	S390_lowcore.clock_comparator = comp;
+	set_clock_comparator(S390_lowcore.clock_comparator);
 }
 
 #define CLOCK_TICK_RATE	1193180 /* Underlying HZ */

arch/s390/lib/delay.c

@@ -47,7 +47,6 @@ static void __udelay_disabled(unsigned long long usecs)
 	lockdep_on();
 	__ctl_load(cr0_saved, 0, 0);
 	local_tick_enable(clock_saved);
-	set_clock_comparator(S390_lowcore.clock_comparator);
 }
 
 static void __udelay_enabled(unsigned long long usecs)
@@ -70,7 +69,6 @@ static void __udelay_enabled(unsigned long long usecs)
 		if (clock_saved)
 			local_tick_enable(clock_saved);
 	} while (get_clock() < end);
-	set_clock_comparator(S390_lowcore.clock_comparator);
 }
 
 /*