padata: Added sysfs primitives to padata subsystem

Added sysfs primitives to padata subsystem. Now API user may
embedded kobject each padata instance contains into any sysfs
hierarchy. For now padata sysfs interface provides only
two objects:
    serial_cpumask   [RW] - cpumask for serial workers
    parallel_cpumask [RW] - cpumask for parallel workers

Signed-off-by: Dan Kruchinin <dkruchinin@acm.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/include/linux/padata.h b/include/linux/padata.h
index 621e773..293ad46 100644
--- a/include/linux/padata.h
+++ b/include/linux/padata.h
@@ -26,6 +26,7 @@
 #include <linux/list.h>
 #include <linux/timer.h>
 #include <linux/notifier.h>
+#include <linux/kobject.h>
 
 #define PADATA_CPU_SERIAL   0x01
 #define PADATA_CPU_PARALLEL 0x02
@@ -142,7 +143,8 @@
  *           cbcpu for parallel and serial works respectivly.
  * @cpumask_change_notifier: Notifiers chain for user-defined notify
  *            callbacks that will be called when either @pcpu or @cbcpu
- *             or both cpumasks change.
+ *            or both cpumasks change.
+ * @kobj: padata instance kernel object.
  * @lock: padata instance lock.
  * @flags: padata flags.
  */
@@ -155,6 +157,7 @@
 		cpumask_var_t		 cbcpu;
 	} cpumask;
 	struct blocking_notifier_head	 cpumask_change_notifier;
+	struct kobject                   kobj;
 	struct mutex			 lock;
 	u8				 flags;
 #define	PADATA_INIT	1