[ARM SMP] Add core ARM support for local timers
Add infrastructure for supporting per-cpu local timers to update
the profiling information and update system time accounting.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 91d5ef3..3bfef09 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -356,6 +356,16 @@
Say Y here to experiment with turning CPUs off and on. CPUs
can be controlled through /sys/devices/system/cpu.
+config LOCAL_TIMERS
+ bool "Use local timer interrupts"
+ depends on SMP && n
+ default y
+ help
+ Enable support for local timers on SMP platforms, rather then the
+ legacy IPI broadcast method. Local timers allows the system
+ accounting to be spread across the timer interval, preventing a
+ "thundering herd" at every timer tick.
+
config PREEMPT
bool "Preemptible Kernel (EXPERIMENTAL)"
depends on EXPERIMENTAL