[S390] tod clock: announce clocksource as perfect

The Time of Day clock is the standard time source for s390. It is
- monotonic
- allows very fast reading
- architecture guarantees at least microsecond stepping
- available as part of the architecture

We should announce the rate of tod as 400 to be in sync with the
description found in clocksource.h:
"400-499:Perfect The ideal clocksource. A must-use where available."

This change will prefer tod over less reliable clock sources.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index 48dae49bc1ec..a963fe81359e 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -307,7 +307,7 @@ static cycle_t read_tod_clock(void)
 
 static struct clocksource clocksource_tod = {
         .name           = "tod",
-        .rating         = 100,
+        .rating         = 400,
         .read           = read_tod_clock,
         .mask           = -1ULL,
         .mult           = 1000,