2 files changed, 14 insertions, 4 deletions

diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index 1314ca0f29be..819f08f1310d 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -202,7 +202,7 @@ extern int lockdep_internal(void);
  */
 
 extern void lockdep_init_map(struct lockdep_map *lock, const char *name,
-                             struct lock_class_key *key);
+                             struct lock_class_key *key, int subclass);
 
 /*
  * Reinitialize a lock key - for cases where there is special locking or
@@ -211,9 +211,14 @@ extern void lockdep_init_map(struct lockdep_map *lock, const char *name,
  * or they are too narrow (they suffer from a false class-split):
  */
 #define lockdep_set_class(lock, key) \
-                lockdep_init_map(&(lock)->dep_map, #key, key)
+                lockdep_init_map(&(lock)->dep_map, #key, key, 0)
 #define lockdep_set_class_and_name(lock, key, name) \
-                lockdep_init_map(&(lock)->dep_map, name, key)
+                lockdep_init_map(&(lock)->dep_map, name, key, 0)
+#define lockdep_set_class_and_subclass(lock, key, sub) \
+                lockdep_init_map(&(lock)->dep_map, #key, key, sub)
+#define lockdep_set_subclass(lock, sub) \
+                lockdep_init_map(&(lock)->dep_map, #lock, \
+                                 (lock)->dep_map.key, sub)
 
 /*
  * Acquire a lock.
@@ -257,10 +262,14 @@ static inline int lockdep_internal(void)
 # define lock_release(l, n, i)                  do { } while (0)
 # define lockdep_init()                         do { } while (0)
 # define lockdep_info()                         do { } while (0)
-# define lockdep_init_map(lock, name, key)      do { (void)(key); } while (0)
+# define lockdep_init_map(lock, name, key, sub) do { (void)(key); } while (0)
 # define lockdep_set_class(lock, key)           do { (void)(key); } while (0)
 # define lockdep_set_class_and_name(lock, key, name) \
                 do { (void)(key); } while (0)
+#define lockdep_set_class_and_subclass(lock, key, sub) \
+                do { (void)(key); } while (0)
+#define lockdep_set_subclass(lock, sub)         do { } while (0)
+
 # define INIT_LOCKDEP
 # define lockdep_reset()                do { debug_locks = 1; } while (0)
 # define lockdep_free_key_range(start, size)    do { } while (0)
diff --git a/include/linux/serio.h b/include/linux/serio.h
index 3a697cc6ecae..b99c5ca9708d 100644
--- a/include/linux/serio.h
+++ b/include/linux/serio.h
@@ -41,6 +41,7 @@ struct serio {
         void (*stop)(struct serio *);
 
         struct serio *parent, *child;
+        unsigned int depth;             /* level of nesting in serio hierarchy */
 
         struct serio_driver *drv;       /* accessed from interrupt, must be protected by serio->lock and serio->sem */
         struct mutex drv_mutex;         /* protects serio->drv so attributes can pin driver */