cpuidle: Make cpuidle's sysfs directory dynamically allocated

The cpuidle sysfs code is designed to have a single instance of per
CPU cpuidle directory.  It is not possible to remove the sysfs entry
and create it again.  This is not a problem with the current code but
future changes will add CPU hotplug support to enable/disable the
device, so it will need to remove the sysfs entry like other
subsystems do.  That won't be possible without this change, because
the kobj is a static object which can't be reused for
kobj_init_and_add().

Add cpuidle_device_kobj to be allocated dynamically when
adding/removing a sysfs entry which is consistent with the other
cpuidle's sysfs entries.

An added benefit is that the sysfs code is now more self-contained
and the includes needed for sysfs can be moved from cpuidle.h
directly into sysfs.c so as to reduce the total number of headers
dragged along with cpuidle.h.

[rjw: Changelog]
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 3 insertions, 4 deletions

diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
index 0bc4b74668e9..b922db53b7ab 100644
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h
@@ -13,8 +13,6 @@
 
 #include <linux/percpu.h>
 #include <linux/list.h>
-#include <linux/kobject.h>
-#include <linux/completion.h>
 #include <linux/hrtimer.h>
 
 #define CPUIDLE_STATE_MAX       10
@@ -61,6 +59,8 @@ struct cpuidle_state {
 
 #define CPUIDLE_DRIVER_FLAGS_MASK (0xFFFF0000)
 
+struct cpuidle_device_kobj;
+
 struct cpuidle_device {
         unsigned int            registered:1;
         unsigned int            enabled:1;
@@ -71,9 +71,8 @@ struct cpuidle_device {
         struct cpuidle_state_usage      states_usage[CPUIDLE_STATE_MAX];
         struct cpuidle_state_kobj *kobjs[CPUIDLE_STATE_MAX];
         struct cpuidle_driver_kobj *kobj_driver;
+        struct cpuidle_device_kobj *kobj_dev;
         struct list_head        device_list;
-        struct kobject          kobj;
-        struct completion       kobj_unregister;
 
 #ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED
         int                     safe_state_index;