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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/Kconfig
parent29c158e81c733ac7d6a75c5ee929f34fb9f92983 (diff)
downloadvexpress-lsk-d1748302f70be7469809809283fe164156a34231.tar.gz
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/Kconfig')
-rw-r--r--kernel/time/Kconfig2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig
index f06a8a36564..b26c2228fe9 100644
--- a/kernel/time/Kconfig
+++ b/kernel/time/Kconfig
@@ -27,3 +27,5 @@ config GENERIC_CLOCKEVENTS_BUILD
default y
depends on GENERIC_CLOCKEVENTS || GENERIC_CLOCKEVENTS_MIGR
+config GENERIC_CLOCKEVENTS_MIN_ADJUST
+ bool