[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>

1 files changed, 10 insertions, 0 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 91d5ef3397be..3bfef0934c9d 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -356,6 +356,16 @@ config HOTPLUG_CPU
           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