diff options
Diffstat (limited to 'include/linux/lockdep.h')
| -rw-r--r-- | include/linux/lockdep.h | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index 619ec3f26cdc..43fb35bd7baf 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -46,15 +46,19 @@ extern int lock_stat; #define NR_LOCKDEP_CACHING_CLASSES 2 /* - * Lock-classes are keyed via unique addresses, by embedding the - * lockclass-key into the kernel (or module) .data section. (For - * static locks we use the lock address itself as the key.) + * A lockdep key is associated with each lock object. For static locks we use + * the lock address itself as the key. Dynamically allocated lock objects can + * have a statically or dynamically allocated key. Dynamically allocated lock + * keys must be registered before being used and must be unregistered before + * the key memory is freed. */ struct lockdep_subclass_key { char __one_byte; } __attribute__ ((__packed__)); +/* hash_entry is used to keep track of dynamically allocated keys. */ struct lock_class_key { + struct hlist_node hash_entry; struct lockdep_subclass_key subkeys[MAX_LOCKDEP_SUBCLASSES]; }; @@ -273,6 +277,9 @@ extern void lockdep_set_selftest_task(struct task_struct *task); extern void lockdep_off(void); extern void lockdep_on(void); +extern void lockdep_register_key(struct lock_class_key *key); +extern void lockdep_unregister_key(struct lock_class_key *key); + /* * These methods are used by specific locking variants (spinlocks, * rwlocks, mutexes and rwsems) to pass init/acquire/release events @@ -434,6 +441,14 @@ static inline void lockdep_set_selftest_task(struct task_struct *task) */ struct lock_class_key { }; +static inline void lockdep_register_key(struct lock_class_key *key) +{ +} + +static inline void lockdep_unregister_key(struct lock_class_key *key) +{ +} + /* * The lockdep_map takes no space if lockdep is disabled: */ |