rtmutex: Turn the plist into an rb-tree

[~andy/linux] / include / linux / rtmutex.h

diff --git a/include/linux/rtmutex.h b/include/linux/rtmutex.h
index de17134244f3b6eb35f70abb907d994b1b5e578d..3aed8d737e1a870a8e1727a50af5108e9dbb87cf 100644 (file)
--- a/include/linux/rtmutex.h
+++ b/include/linux/rtmutex.h
@@ -13,7 +13,7 @@
 #define __LINUX_RT_MUTEX_H
 
 #include <linux/linkage.h>
-#include <linux/plist.h>
+#include <linux/rbtree.h>
 #include <linux/spinlock_types.h>
 
 extern int max_lock_depth; /* for sysctl */
@@ -22,12 +22,14 @@ extern int max_lock_depth; /* for sysctl */
  * The rt_mutex structure
  *
  * @wait_lock: spinlock to protect the structure
- * @wait_list: pilist head to enqueue waiters in priority order
+ * @waiters:   rbtree root to enqueue waiters in priority order
+ * @waiters_leftmost: top waiter
  * @owner:     the mutex owner
  */
 struct rt_mutex {
        raw_spinlock_t          wait_lock;
-       struct plist_head       wait_list;
+       struct rb_root          waiters;
+       struct rb_node          *waiters_leftmost;
        struct task_struct      *owner;
 #ifdef CONFIG_DEBUG_RT_MUTEXES
        int                     save_state;
@@ -66,7 +68,7 @@ struct hrtimer_sleeper;
 
 #define __RT_MUTEX_INITIALIZER(mutexname) \
        { .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(mutexname.wait_lock) \
-       , .wait_list = PLIST_HEAD_INIT(mutexname.wait_list) \
+       , .waiters = RB_ROOT \
        , .owner = NULL \
        __DEBUG_RT_MUTEX_INITIALIZER(mutexname)}
 
@@ -98,12 +100,4 @@ extern int rt_mutex_trylock(struct rt_mutex *lock);
 
 extern void rt_mutex_unlock(struct rt_mutex *lock);
 
-#ifdef CONFIG_RT_MUTEXES
-# define INIT_RT_MUTEXES(tsk)                                          \
-       .pi_waiters     = PLIST_HEAD_INIT(tsk.pi_waiters),      \
-       INIT_RT_MUTEX_DEBUG(tsk)
-#else
-# define INIT_RT_MUTEXES(tsk)
-#endif
-
 #endif