Merge branch 'acpi-ec'

[linux-drm-fsl-dcu.git] / include / linux / osq_lock.h

diff --git a/include/linux/osq_lock.h b/include/linux/osq_lock.h
index 90230d5811c5aab49b8755fceda1e1d5e6d326aa..3a6490e81b2856821ca190f438c039136a7fa207 100644 (file)
--- a/include/linux/osq_lock.h
+++ b/include/linux/osq_lock.h
@@ -5,8 +5,11 @@
  * An MCS like lock especially tailored for optimistic spinning for sleeping
  * lock implementations (mutex, rwsem, etc).
  */
-
-#define OSQ_UNLOCKED_VAL (0)
+struct optimistic_spin_node {
+       struct optimistic_spin_node *next, *prev;
+       int locked; /* 1 if lock acquired */
+       int cpu; /* encoded CPU # + 1 value */
+};
 
 struct optimistic_spin_queue {
        /*
@@ -16,6 +19,8 @@ struct optimistic_spin_queue {
        atomic_t tail;
 };
 
+#define OSQ_UNLOCKED_VAL (0)
+
 /* Init macro and function. */
 #define OSQ_LOCK_UNLOCKED { ATOMIC_INIT(OSQ_UNLOCKED_VAL) }
 
@@ -24,4 +29,7 @@ static inline void osq_lock_init(struct optimistic_spin_queue *lock)
        atomic_set(&lock->tail, OSQ_UNLOCKED_VAL);
 }
 
+extern bool osq_lock(struct optimistic_spin_queue *lock);
+extern void osq_unlock(struct optimistic_spin_queue *lock);
+
 #endif