[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, 3 insertions, 6 deletions

diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c
index 6dbe9488d3f..41db3cc653f 100644
--- a/drivers/s390/cio/cio.c
+++ b/drivers/s390/cio/cio.c
@@ -651,12 +651,9 @@ do_IRQ (struct pt_regs *regs)
         old_regs = set_irq_regs(regs);
         irq_enter();
         s390_idle_check();
-        if (S390_lowcore.int_clock >= S390_lowcore.jiffy_timer)
-                /**
-                 * Make sure that the i/o interrupt did not "overtake"
-                 * the last HZ timer interrupt.
-                 */
-                account_ticks(S390_lowcore.int_clock);
+        if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator)
+                /* Serve timer interrupts first. */
+                clock_comparator_work();
         /*
          * Get interrupt information from lowcore
          */