[GitHub/mt8127/android_kernel_alcatel_ttab.git] / kernel / mutex-debug.h

/*
 * Mutexes: blocking mutual exclusion locks
 *
 * started by Ingo Molnar:
 *
 *  Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
 *
 * This file contains mutex debugging related internal declarations,
 * prototypes and inline functions, for the CONFIG_DEBUG_MUTEXES case.
 * More details are in kernel/mutex-debug.c.
 */

extern spinlock_t debug_mutex_lock;
extern struct list_head debug_mutex_held_locks;
extern int debug_mutex_on;

/*
 * In the debug case we carry the caller's instruction pointer into
 * other functions, but we dont want the function argument overhead
 * in the nondebug case - hence these macros:
 */
#define __IP_DECL__		, unsigned long ip
#define __IP__			, ip
#define __RET_IP__		, (unsigned long)__builtin_return_address(0)

/*
 * This must be called with lock->wait_lock held.
 */
extern void debug_mutex_set_owner(struct mutex *lock,
				  struct thread_info *new_owner __IP_DECL__);

static inline void debug_mutex_clear_owner(struct mutex *lock)
{
	lock->owner = NULL;
}

extern void debug_mutex_init_waiter(struct mutex_waiter *waiter);
extern void debug_mutex_wake_waiter(struct mutex *lock,
				    struct mutex_waiter *waiter);
extern void debug_mutex_free_waiter(struct mutex_waiter *waiter);
extern void debug_mutex_add_waiter(struct mutex *lock,
				   struct mutex_waiter *waiter,
				   struct thread_info *ti __IP_DECL__);
extern void mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter,
				struct thread_info *ti);
extern void debug_mutex_unlock(struct mutex *lock);
extern void debug_mutex_init(struct mutex *lock, const char *name);

#define debug_spin_lock_save(lock, flags)		\
	do {						\
		local_irq_save(flags);			\
		if (debug_mutex_on)			\
			spin_lock(lock);		\
	} while (0)

#define debug_spin_unlock_restore(lock, flags)		\
	do {						\
		if (debug_mutex_on)			\
			spin_unlock(lock);		\
		local_irq_restore(flags);		\
		preempt_check_resched();		\
	} while (0)

#define spin_lock_mutex(lock, flags)			\
	do {						\
		struct mutex *l = container_of(lock, struct mutex, wait_lock); \
							\
		DEBUG_LOCKS_WARN_ON(in_interrupt());	\
		debug_spin_lock_save(&debug_mutex_lock, flags); \
		spin_lock(lock);			\
		DEBUG_LOCKS_WARN_ON(l->magic != l);	\
	} while (0)

#define spin_unlock_mutex(lock, flags)			\
	do {						\
		spin_unlock(lock);			\
		debug_spin_unlock_restore(&debug_mutex_lock, flags);	\
	} while (0)

#define DEBUG_OFF()					\
do {							\
	if (debug_mutex_on) {				\
		debug_mutex_on = 0;			\
		console_verbose();			\
		if (spin_is_locked(&debug_mutex_lock))	\
			spin_unlock(&debug_mutex_lock);	\
	}						\
} while (0)

#define DEBUG_BUG()					\
do {							\
	if (debug_mutex_on) {				\
		DEBUG_OFF();				\
		BUG();					\
	}						\
} while (0)

#define DEBUG_LOCKS_WARN_ON(c)				\
do {							\
	if (unlikely(c && debug_mutex_on)) {		\
		DEBUG_OFF();				\
		WARN_ON(1);				\
	}						\
} while (0)

#ifdef CONFIG_SMP
# define SMP_DEBUG_LOCKS_WARN_ON(c)			DEBUG_LOCKS_WARN_ON(c)
#else
# define SMP_DEBUG_LOCKS_WARN_ON(c)			do { } while (0)
#endif
Commit	Line	Data
408894ee IM	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	extern spinlock_t debug_mutex_lock;
	14	extern struct list_head debug_mutex_held_locks;
	15	extern int debug_mutex_on;
	16
	17	/*
	18	* In the debug case we carry the caller's instruction pointer into
	19	* other functions, but we dont want the function argument overhead
	20	* in the nondebug case - hence these macros:
	21	*/
	22	#define __IP_DECL__ , unsigned long ip
	23	#define __IP__ , ip
	24	#define __RET_IP__ , (unsigned long)__builtin_return_address(0)
	25
	26	/*
	27	* This must be called with lock->wait_lock held.
	28	*/
	29	extern void debug_mutex_set_owner(struct mutex *lock,
	30	struct thread_info *new_owner __IP_DECL__);
	31
	32	static inline void debug_mutex_clear_owner(struct mutex *lock)
	33	{
	34	lock->owner = NULL;
	35	}
	36
	37	extern void debug_mutex_init_waiter(struct mutex_waiter *waiter);
	38	extern void debug_mutex_wake_waiter(struct mutex *lock,
	39	struct mutex_waiter *waiter);
	40	extern void debug_mutex_free_waiter(struct mutex_waiter *waiter);
	41	extern void debug_mutex_add_waiter(struct mutex *lock,
	42	struct mutex_waiter *waiter,
	43	struct thread_info *ti __IP_DECL__);
	44	extern void mutex_remove_waiter(struct mutex lock, struct mutex_waiter waiter,
	45	struct thread_info *ti);
	46	extern void debug_mutex_unlock(struct mutex *lock);
	47	extern void debug_mutex_init(struct mutex lock, const char name);
	48
408894ee IM	49	#define debug_spin_lock_save(lock, flags) \
	50	do { \
	51	local_irq_save(flags); \
	52	if (debug_mutex_on) \
	53	spin_lock(lock); \
	54	} while (0)
	55
1fb00c6c	56	#define debug_spin_unlock_restore(lock, flags) \
408894ee IM	57	do { \
	58	if (debug_mutex_on) \
	59	spin_unlock(lock); \
	60	local_irq_restore(flags); \
	61	preempt_check_resched(); \
	62	} while (0)
	63
1fb00c6c	64	#define spin_lock_mutex(lock, flags) \
408894ee IM	65	do { \
	66	struct mutex *l = container_of(lock, struct mutex, wait_lock); \
	67	\
9e7f4d45	68	DEBUG_LOCKS_WARN_ON(in_interrupt()); \
1fb00c6c	69	debug_spin_lock_save(&debug_mutex_lock, flags); \
408894ee	70	spin_lock(lock); \
9e7f4d45	71	DEBUG_LOCKS_WARN_ON(l->magic != l); \
408894ee IM	72	} while (0)
408894ee IM	73
1fb00c6c	74	#define spin_unlock_mutex(lock, flags) \
408894ee IM	75	do { \
408894ee IM	76	spin_unlock(lock); \
1fb00c6c	77	debug_spin_unlock_restore(&debug_mutex_lock, flags); \
408894ee IM	78	} while (0)
	79
	80	#define DEBUG_OFF() \
	81	do { \
	82	if (debug_mutex_on) { \
	83	debug_mutex_on = 0; \
	84	console_verbose(); \
	85	if (spin_is_locked(&debug_mutex_lock)) \
	86	spin_unlock(&debug_mutex_lock); \
	87	} \
	88	} while (0)
	89
	90	#define DEBUG_BUG() \
	91	do { \
	92	if (debug_mutex_on) { \
	93	DEBUG_OFF(); \
	94	BUG(); \
	95	} \
	96	} while (0)
	97
9e7f4d45	98	#define DEBUG_LOCKS_WARN_ON(c) \
408894ee IM	99	do { \
	100	if (unlikely(c && debug_mutex_on)) { \
	101	DEBUG_OFF(); \
	102	WARN_ON(1); \
	103	} \
	104	} while (0)
	105
408894ee	106	#ifdef CONFIG_SMP
9e7f4d45	107	# define SMP_DEBUG_LOCKS_WARN_ON(c) DEBUG_LOCKS_WARN_ON(c)
408894ee	108	#else
9e7f4d45	109	# define SMP_DEBUG_LOCKS_WARN_ON(c) do { } while (0)
408894ee IM	110	#endif
408894ee IM	111