1 files changed, 9 insertions, 0 deletions

diff --git a/include/linux/rwsem.h b/include/linux/rwsem.h
index 54bd7cd7ecbd..8da67d625e13 100644
--- a/include/linux/rwsem.h
+++ b/include/linux/rwsem.h
@@ -125,8 +125,17 @@ extern void downgrade_write(struct rw_semaphore *sem);
  */
 extern void down_read_nested(struct rw_semaphore *sem, int subclass);
 extern void down_write_nested(struct rw_semaphore *sem, int subclass);
+extern void _down_write_nest_lock(struct rw_semaphore *sem, struct lockdep_map *nest_lock);
+
+# define down_write_nest_lock(sem, nest_lock)                   \
+do {                                                            \
+        typecheck(struct lockdep_map *, &(nest_lock)->dep_map); \
+        _down_write_nest_lock(sem, &(nest_lock)->dep_map);      \
+} while (0);
+
 #else
 # define down_read_nested(sem, subclass)                down_read(sem)
+# define down_write_nest_lock(sem, nest_lock)   down_write(sem)
 # define down_write_nested(sem, subclass)       down_write(sem)
 #endif