[PATCH] lockdep: prove rwsem locking correctness
Use the lock validator framework to prove rwsem locking correctness.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/include/linux/rwsem.h b/include/linux/rwsem.h
index 9358153..658afb3 100644
--- a/include/linux/rwsem.h
+++ b/include/linux/rwsem.h
@@ -27,64 +27,55 @@
/*
* lock for reading
*/
-static inline void down_read(struct rw_semaphore *sem)
-{
- might_sleep();
- __down_read(sem);
-}
+extern void down_read(struct rw_semaphore *sem);
/*
* trylock for reading -- returns 1 if successful, 0 if contention
*/
-static inline int down_read_trylock(struct rw_semaphore *sem)
-{
- int ret;
- ret = __down_read_trylock(sem);
- return ret;
-}
+extern int down_read_trylock(struct rw_semaphore *sem);
/*
* lock for writing
*/
-static inline void down_write(struct rw_semaphore *sem)
-{
- might_sleep();
- __down_write(sem);
-}
+extern void down_write(struct rw_semaphore *sem);
/*
* trylock for writing -- returns 1 if successful, 0 if contention
*/
-static inline int down_write_trylock(struct rw_semaphore *sem)
-{
- int ret;
- ret = __down_write_trylock(sem);
- return ret;
-}
+extern int down_write_trylock(struct rw_semaphore *sem);
/*
* release a read lock
*/
-static inline void up_read(struct rw_semaphore *sem)
-{
- __up_read(sem);
-}
+extern void up_read(struct rw_semaphore *sem);
/*
* release a write lock
*/
-static inline void up_write(struct rw_semaphore *sem)
-{
- __up_write(sem);
-}
+extern void up_write(struct rw_semaphore *sem);
/*
* downgrade write lock to read lock
*/
-static inline void downgrade_write(struct rw_semaphore *sem)
-{
- __downgrade_write(sem);
-}
+extern void downgrade_write(struct rw_semaphore *sem);
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+/*
+ * nested locking:
+ */
+extern void down_read_nested(struct rw_semaphore *sem, int subclass);
+extern void down_write_nested(struct rw_semaphore *sem, int subclass);
+/*
+ * Take/release a lock when not the owner will release it:
+ */
+extern void down_read_non_owner(struct rw_semaphore *sem);
+extern void up_read_non_owner(struct rw_semaphore *sem);
+#else
+# define down_read_nested(sem, subclass) down_read(sem)
+# define down_write_nested(sem, subclass) down_write(sem)
+# define down_read_non_owner(sem) down_read(sem)
+# define up_read_non_owner(sem) up_read(sem)
+#endif
#endif /* __KERNEL__ */
#endif /* _LINUX_RWSEM_H */