Merge tag 'dm-4.2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device...

[firefly-linux-kernel-4.4.55.git] / include / linux / osq_lock.h

diff --git a/include/linux/osq_lock.h b/include/linux/osq_lock.h
index 3a6490e81b2856821ca190f438c039136a7fa207..703ea5c30a33f84bd60fcc19415b48c53084f5c7 100644 (file)
--- a/include/linux/osq_lock.h
+++ b/include/linux/osq_lock.h
@@ -32,4 +32,9 @@ static inline void osq_lock_init(struct optimistic_spin_queue *lock)
 extern bool osq_lock(struct optimistic_spin_queue *lock);
 extern void osq_unlock(struct optimistic_spin_queue *lock);
 
+static inline bool osq_is_locked(struct optimistic_spin_queue *lock)
+{
+       return atomic_read(&lock->tail) != OSQ_UNLOCKED_VAL;
+}
+
 #endif