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 */
16extern void debug_mutex_lock_common(struct mutex *lock,
17				    struct mutex_waiter *waiter);
18extern void debug_mutex_wake_waiter(struct mutex *lock,
19				    struct mutex_waiter *waiter);
20extern void debug_mutex_free_waiter(struct mutex_waiter *waiter);
21extern void debug_mutex_add_waiter(struct mutex *lock,
22				   struct mutex_waiter *waiter,
23				   struct thread_info *ti);
24extern void mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter,
25				struct thread_info *ti);
26extern void debug_mutex_unlock(struct mutex *lock);
27extern void debug_mutex_init(struct mutex *lock, const char *name,
28			     struct lock_class_key *key);
29
30static inline void mutex_set_owner(struct mutex *lock)
31{
32	lock->owner = current_thread_info();
33}
34
35static 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