cpuidle: make cpuidle sysfs driver/governor switch off by default

Index: linux-2.6.22-rc-mm/drivers/cpuidle/cpuidle.c
===================================================================
@@ -25,7 +25,6 @@
 LIST_HEAD(cpuidle_detected_devices);
 static void (*pm_idle_old)(void);
 
-
 /**
  * cpuidle_idle_call - the main idle loop
  *

Index: linux-2.6.22-rc-mm/drivers/cpuidle/sysfs.c
===================================================================
@@ -13,6 +13,14 @@
 
 #include "cpuidle.h"
 
+static unsigned int sysfs_switch;
+static int __init cpuidle_sysfs_setup(char *unused)
+{
+	sysfs_switch = 1;
+	return 1;
+}
+__setup("cpuidle_sysfs_switch", cpuidle_sysfs_setup);
+
 static ssize_t show_available_drivers(struct sys_device *dev, char *buf)
 {
 	ssize_t i = 0;

@@ -127,6 +135,15 @@
 	return count;
 }
 
+static SYSDEV_ATTR(current_driver_ro, 0444, show_current_driver, NULL);
+static SYSDEV_ATTR(current_governor_ro, 0444, show_current_governor, NULL);
+
+static struct attribute *cpuclass_default_attrs[] = {
+	&attr_current_driver_ro.attr,
+	&attr_current_governor_ro.attr,
+	NULL
+};
+
 static SYSDEV_ATTR(available_drivers, 0444, show_available_drivers, NULL);
 static SYSDEV_ATTR(available_governors, 0444, show_available_governors, NULL);
 static SYSDEV_ATTR(current_driver, 0644, show_current_driver,

@@ -134,7 +151,7 @@
 static SYSDEV_ATTR(current_governor, 0644, show_current_governor,
 	store_current_governor);
 
-static struct attribute *cpuclass_default_attrs[] = {
+static struct attribute *cpuclass_switch_attrs[] = {
 	&attr_available_drivers.attr,
 	&attr_available_governors.attr,
 	&attr_current_driver.attr,

@@ -152,6 +169,9 @@
  */
 int cpuidle_add_class_sysfs(struct sysdev_class *cls)
 {
+	if (sysfs_switch)
+		cpuclass_attr_group.attrs = cpuclass_switch_attrs;
+
 	return sysfs_create_group(&cls->kset.kobj, &cpuclass_attr_group);
 }