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s390/time: improve steering precision

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The common timekeeping code steers the clock by adjusting the multiplier
value of the clock. With the current value of 1000 precision is lost
when the clock is steered with a userspace daemon. Increase the multiplier
and the shift values to increase precision.

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Sven Schnelle 2023-09-14 08:58:54 +02:00 committed by Heiko Carstens
parent 5d8cc70c36
commit fc17e992e1
1 changed files with 2 additions and 2 deletions
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arch/s390/kernel/time.c
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@ -251,8 +251,8 @@ static struct clocksource clocksource_tod = {
.rating = 400,
.read = read_tod_clock,
.mask = CLOCKSOURCE_MASK(64),
.mult = 1000,
.shift = 12,
.mult = 4096000,
.shift = 24,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
.vdso_clock_mode = VDSO_CLOCKMODE_TOD,
};