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Lockdep: add lockdep_set_class_and_subclass() and lockdep_set_subclass()

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This annotation makes it possible to assign a subclass on lock init. This
annotation is meant to reduce the _nested() annotations by assigning a
default subclass.

One could do without this annotation and rely on lockdep_set_class()
exclusively, but that would require a manual stack of struct lock_class_key
objects.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Peter Zijlstra 2006-10-11 01:45:14 -04:00 • committed by Dmitry Torokhov
parent 86255d9d0b
commit 4dfbb9d8c6
7 changed files with 23 additions and 14 deletions
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2
lib/rwsem.c
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@ -19,7 +19,7 @@ void __init_rwsem(struct rw_semaphore *sem, const char *name,
* 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);
lockdep_init_map(&sem->dep_map, name, key, 0);
#endif
sem->count = RWSEM_UNLOCKED_VALUE;
spin_lock_init(&sem->wait_lock);