1 files changed, 9 insertions, 0 deletions

diff --git a/include/linux/semaphore.h b/include/linux/semaphore.h
index 39fa04966aa8..c83fc2b65f01 100644
--- a/include/linux/semaphore.h
+++ b/include/linux/semaphore.h
@@ -43,4 +43,13 @@ extern int __must_check down_trylock(struct semaphore *sem);
 extern int __must_check down_timeout(struct semaphore *sem, long jiffies);
 extern void up(struct semaphore *sem);
 
+extern void __down(struct semaphore *sem);
+extern void __up(struct semaphore *sem);
+
+struct semaphore_waiter {
+        struct list_head list;
+        struct task_struct *task;
+        int up;
+};
+
 #endif /* __LINUX_SEMAPHORE_H */