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[S390] tod clock: announce clocksource as perfect

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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>
This commit is contained in:
Christian Borntraeger 2007-11-05 11:10:14 +01:00 committed by Martin Schwidefsky
parent 69d39d6669
commit d2cb0e6ecb
1 changed files with 1 additions and 1 deletions
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2
arch/s390/kernel/time.c
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@ -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,