[S390] Convert s390 to GENERIC_CLOCKEVENTS.

This way we get rid of s390's NO_IDLE_HZ and use the generic dynticks
variant instead. In addition we get high resolution timers for free.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

1 files changed, 7 insertions, 7 deletions

diff --git a/arch/s390/lib/delay.c b/arch/s390/lib/delay.c
index 70f2a862b670..eae21a8ac72d 100644
--- a/arch/s390/lib/delay.c
+++ b/arch/s390/lib/delay.c
@@ -34,7 +34,7 @@ void __delay(unsigned long loops)
  */
 void __udelay(unsigned long usecs)
 {
-        u64 end, time, jiffy_timer = 0;
+        u64 end, time, old_cc = 0;
         unsigned long flags, cr0, mask, dummy;
         int irq_context;
 
@@ -43,8 +43,8 @@ void __udelay(unsigned long usecs)
                 local_bh_disable();
         local_irq_save(flags);
         if (raw_irqs_disabled_flags(flags)) {
-                jiffy_timer = S390_lowcore.jiffy_timer;
-                S390_lowcore.jiffy_timer = -1ULL - (4096 << 12);
+                old_cc = S390_lowcore.clock_comparator;
+                S390_lowcore.clock_comparator = -1ULL;
                 __ctl_store(cr0, 0, 0);
                 dummy = (cr0 & 0xffff00e0) | 0x00000800;
                 __ctl_load(dummy , 0, 0);
@@ -55,8 +55,8 @@ void __udelay(unsigned long usecs)
 
         end = get_clock() + ((u64) usecs << 12);
         do {
-                time = end < S390_lowcore.jiffy_timer ?
-                        end : S390_lowcore.jiffy_timer;
+                time = end < S390_lowcore.clock_comparator ?
+                        end : S390_lowcore.clock_comparator;
                 set_clock_comparator(time);
                 trace_hardirqs_on();
                 __load_psw_mask(mask);
@@ -65,10 +65,10 @@ void __udelay(unsigned long usecs)
 
         if (raw_irqs_disabled_flags(flags)) {
                 __ctl_load(cr0, 0, 0);
-                S390_lowcore.jiffy_timer = jiffy_timer;
+                S390_lowcore.clock_comparator = old_cc;
         }
         if (!irq_context)
                 _local_bh_enable();
-        set_clock_comparator(S390_lowcore.jiffy_timer);
+        set_clock_comparator(S390_lowcore.clock_comparator);
         local_irq_restore(flags);
 }