1 /*
2 * Mutexes: blocking mutual exclusion locks
3 *
4 * started by Ingo Molnar:
5 *
6 * Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
7 *
8 * This file contains mutex debugging related internal declarations,
9 * prototypes and inline functions, for the CONFIG_DEBUG_MUTEXES case.
10 * More details are in kernel/mutex-debug.c.
11 */
12
13 /*
14 * This must be called with lock->wait_lock held.
15 */
16 extern void debug_mutex_lock_common(struct mutex *lock,
17 struct mutex_waiter *waiter);
18 extern void debug_mutex_wake_waiter(struct mutex *lock,
19 struct mutex_waiter *waiter);
20 extern void debug_mutex_free_waiter(struct mutex_waiter *waiter);
21 extern void debug_mutex_add_waiter(struct mutex *lock,
22 struct mutex_waiter *waiter,
23 struct thread_info *ti);
24 extern void mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter,
25 struct thread_info *ti);
26 extern void debug_mutex_unlock(struct mutex *lock);
27 extern void debug_mutex_init(struct mutex *lock, const char *name,
28 struct lock_class_key *key);
29
mutex_set_owner(struct mutex * lock)30 static inline void mutex_set_owner(struct mutex *lock)
31 {
32 lock->owner = current_thread_info();
33 }
34
mutex_clear_owner(struct mutex * lock)35 static inline void mutex_clear_owner(struct mutex *lock)
36 {
37 lock->owner = NULL;
38 }
39
40 #define spin_lock_mutex(lock, flags) \
41 do { \
42 struct mutex *l = container_of(lock, struct mutex, wait_lock); \
43 \
44 DEBUG_LOCKS_WARN_ON(in_interrupt()); \
45 local_irq_save(flags); \
46 arch_spin_lock(&(lock)->rlock.raw_lock);\
47 DEBUG_LOCKS_WARN_ON(l->magic != l); \
48 } while (0)
49
50 #define spin_unlock_mutex(lock, flags) \
51 do { \
52 arch_spin_unlock(&(lock)->rlock.raw_lock); \
53 local_irq_restore(flags); \
54 preempt_check_resched(); \
55 } while (0)
56