csky: CPU-hotplug supported for SMP
This is a simple implement of CPU-hotplug for power saving. CPU use
wait instruction to enter power saving mode and waiting for IPI wakeup
signal.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig
index cb64f8d..8bdbe92 100644
--- a/arch/csky/Kconfig
+++ b/arch/csky/Kconfig
@@ -198,6 +198,15 @@
hex "DRAM start addr (the same with memory-section in dts)"
default 0x0
+config HOTPLUG_CPU
+ bool "Support for hot-pluggable CPUs"
+ select GENERIC_IRQ_MIGRATION
+ depends on SMP
+ help
+ Say Y here to allow turning CPUs off and on. CPUs can be
+ controlled through /sys/devices/system/cpu/cpu1/hotplug/target.
+
+ Say N if you want to disable CPU hotplug.
endmenu
source "kernel/Kconfig.hz"
