lockdep, rwsem: provide down_write_nest_lock()

[karo-tx-linux.git] / include / linux / rwsem.h

diff --git a/include/linux/rwsem.h b/include/linux/rwsem.h
index 54bd7cd7ecbd11449b9e15b49f9ab7e208e96413..413cc11e414a7af34bd0946dac18f29021e7ecbd 100644 (file)
--- 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_read(sem)
 # define down_write_nested(sem, subclass)      down_write(sem)
 #endif