[ARM SMP] Add hotplug CPU infrastructure

This patch adds the infrastructure to support hotplug CPU on ARM
platforms.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 7 insertions, 0 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index dc6d8342e5e6..6b12d71978de 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -349,6 +349,13 @@ config NR_CPUS
         depends on SMP
         default "4"
 
+config HOTPLUG_CPU
+        bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
+        depends on SMP && HOTPLUG && EXPERIMENTAL
+        help
+          Say Y here to experiment with turning CPUs off and on.  CPUs
+          can be controlled through /sys/devices/system/cpu.
+
 config PREEMPT
         bool "Preemptible Kernel (EXPERIMENTAL)"
         depends on EXPERIMENTAL