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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2009-08-14 09:47:21 -0400
committerThomas Gleixner <tglx@linutronix.de>2009-08-15 04:55:46 -0400
commitf1b82746c1e93daf24e1ab9bfbd39bcdb2e7018b (patch)
tree1403e3662dd3b32cb8b17218bfdd9a640061f654 /arch/s390
parent1be396794897f80bfc8774719ba60309a9e3d374 (diff)
clocksource: Cleanup clocksource selection
If a non high-resolution clocksource is first set as override clock and then registered it becomes active even if the system is in one-shot mode. Move the override check from sysfs_override_clocksource to the clocksource selection. That fixes the bug and simplifies the code. The check in clocksource_register for double registration of the same clocksource is removed without replacement. To find the initial clocksource a new weak function in jiffies.c is defined that returns the jiffies clocksource. The architecture code can then override the weak function with a more suitable clocksource, e.g. the TOD clock on s390. [ tglx: Folded in a fix from John Stultz ] Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Acked-by: John Stultz <johnstul@us.ibm.com> Cc: Daniel Walker <dwalker@fifo99.com> LKML-Reference: <20090814134808.388024160@de.ibm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/kernel/time.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index d4c8e9c47c81..afefe514df0f 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -205,6 +205,10 @@ static struct clocksource clocksource_tod = {
205 .flags = CLOCK_SOURCE_IS_CONTINUOUS, 205 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
206}; 206};
207 207
208struct clocksource * __init clocksource_default_clock(void)
209{
210 return &clocksource_tod;
211}
208 212
209void update_vsyscall(struct timespec *wall_time, struct clocksource *clock) 213void update_vsyscall(struct timespec *wall_time, struct clocksource *clock)
210{ 214{