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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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20
lib/rwsem-spinlock.c
View file

@ -20,8 +20,16 @@ struct rwsem_waiter {
/*
* initialise the semaphore
*/
void fastcall init_rwsem(struct rw_semaphore *sem)
void __init_rwsem(struct rw_semaphore *sem, const char *name,
struct lock_class_key *key)
{
#ifdef CONFIG_DEBUG_LOCK_ALLOC
/*
* Make sure we are not reinitializing a held semaphore:
*/
debug_check_no_locks_freed((void *)sem, sizeof(*sem));
lockdep_init_map(&sem->dep_map, name, key);
#endif
sem->activity = 0;
spin_lock_init(&sem->wait_lock);
INIT_LIST_HEAD(&sem->wait_list);
@ -183,7 +191,7 @@ int fastcall __down_read_trylock(struct rw_semaphore *sem)
* get a write lock on the semaphore
* - we increment the waiting count anyway to indicate an exclusive lock
*/
void fastcall __sched __down_write(struct rw_semaphore *sem)
void fastcall __sched __down_write_nested(struct rw_semaphore *sem, int subclass)
{
struct rwsem_waiter waiter;
struct task_struct *tsk;
@ -223,6 +231,11 @@ void fastcall __sched __down_write(struct rw_semaphore *sem)
;
}
void fastcall __sched __down_write(struct rw_semaphore *sem)
{
__down_write_nested(sem, 0);
}
/*
* trylock for writing -- returns 1 if successful, 0 if contention
*/
@ -292,9 +305,10 @@ void fastcall __downgrade_write(struct rw_semaphore *sem)
spin_unlock_irqrestore(&sem->wait_lock, flags);
}
EXPORT_SYMBOL(init_rwsem);
EXPORT_SYMBOL(__init_rwsem);
EXPORT_SYMBOL(__down_read);
EXPORT_SYMBOL(__down_read_trylock);
EXPORT_SYMBOL(__down_write_nested);
EXPORT_SYMBOL(__down_write);
EXPORT_SYMBOL(__down_write_trylock);
EXPORT_SYMBOL(__up_read);