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[PATCH] lockdep: prove rwsem locking correctness

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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>
This commit is contained in:
Ingo Molnar
2006-07-03 00:24:53 -07:00
committed by Linus Torvalds
parent a8f24a3978
commit 4ea2176dfa
9 changed files with 184 additions and 51 deletions
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59
include/linux/rwsem.h
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@@ -27,64 +27,55 @@ struct rw_semaphore;
/*
* 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 */