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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2011-08-23 15:29:42 +0200
committerThomas Gleixner <tglx@linutronix.de>2011-09-08 11:10:56 +0200
commitd1748302f70be7469809809283fe164156a34231 (patch)
treec81137f4126f2fe1451c28441415c1cd0fa0f7cd /kernel/time/tick-common.c
parent29c158e81c733ac7d6a75c5ee929f34fb9f92983 (diff)
clockevents: Make minimum delay adjustments configurable
The automatic increase of the min_delta_ns of a clockevents device should be done in the clockevents code as the minimum delay is an attribute of the clockevents device. In addition not all architectures want the automatic adjustment, on a massively virtualized system it can happen that the programming of a clock event fails several times in a row because the virtual cpu has been rescheduled quickly enough. In that case the minimum delay will erroneously be increased with no way back. The new config symbol GENERIC_CLOCKEVENTS_MIN_ADJUST is used to enable the automatic adjustment. The config option is selected only for x86. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: john stultz <johnstul@us.ibm.com> Link: http://lkml.kernel.org/r/20110823133142.494157493@de.ibm.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/time/tick-common.c')
-rw-r--r--kernel/time/tick-common.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index 119528de823..da6c9ecad4e 100644
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -94,7 +94,7 @@ void tick_handle_periodic(struct clock_event_device *dev)
*/
next = ktime_add(dev->next_event, tick_period);
for (;;) {
- if (!clockevents_program_event(dev, next, ktime_get()))
+ if (!clockevents_program_event(dev, next, false))
return;
/*
* Have to be careful here. If we're in oneshot mode,
@@ -137,7 +137,7 @@ void tick_setup_periodic(struct clock_event_device *dev, int broadcast)
clockevents_set_mode(dev, CLOCK_EVT_MODE_ONESHOT);
for (;;) {
- if (!clockevents_program_event(dev, next, ktime_get()))
+ if (!clockevents_program_event(dev, next, false))
return;
next = ktime_add(next, tick_period);
}