From fc17e992e1fdc5d2e3cf1049073aad0dd3933372 Mon Sep 17 00:00:00 2001
From: Sven Schnelle <svens@linux.ibm.com>
Date: Thu, 14 Sep 2023 08:58:54 +0200
Subject: s390/time: improve steering precision
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>
---
arch/s390/kernel/time.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
(limited to 'arch/s390/kernel/time.c')
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index 14abad953c02..8357306fb76e 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -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,
};
--
cgit