[PATCH] Hotplug CPUs: cpu_down()

Implement cpu_down(): uses stop_machine to freeze the machine, then
uses (arch-specific) __cpu_disable() and migrate_all_tasks().

Whole thing under CONFIG_HOTPLUG_CPU, so doesn't break archs which
don't define that.

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 83a37dc0ec3f..7ca3f486868f 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -63,6 +63,7 @@ extern struct semaphore cpucontrol;
 	static struct notifier_block fn##_nb = { fn, pri };	\
 	register_cpu_notifier(&fn##_nb);			\
 }
+int cpu_down(unsigned int cpu);
 #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
 #else
 #define lock_cpu_hotplug()	do { } while (0)