[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / lockdep.h

/*
 * Runtime locking correctness validator
 *
 *  Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
 *
 * see Documentation/lockdep-design.txt for more details.
 */
#ifndef __LINUX_LOCKDEP_H
#define __LINUX_LOCKDEP_H

#ifdef CONFIG_LOCKDEP

#include <linux/linkage.h>
#include <linux/list.h>
#include <linux/debug_locks.h>
#include <linux/stacktrace.h>

/*
 * Lock-class usage-state bits:
 */
enum lock_usage_bit
{
	LOCK_USED = 0,
	LOCK_USED_IN_HARDIRQ,
	LOCK_USED_IN_SOFTIRQ,
	LOCK_ENABLED_SOFTIRQS,
	LOCK_ENABLED_HARDIRQS,
	LOCK_USED_IN_HARDIRQ_READ,
	LOCK_USED_IN_SOFTIRQ_READ,
	LOCK_ENABLED_SOFTIRQS_READ,
	LOCK_ENABLED_HARDIRQS_READ,
	LOCK_USAGE_STATES
};

/*
 * Usage-state bitmasks:
 */
#define LOCKF_USED			(1 << LOCK_USED)
#define LOCKF_USED_IN_HARDIRQ		(1 << LOCK_USED_IN_HARDIRQ)
#define LOCKF_USED_IN_SOFTIRQ		(1 << LOCK_USED_IN_SOFTIRQ)
#define LOCKF_ENABLED_HARDIRQS		(1 << LOCK_ENABLED_HARDIRQS)
#define LOCKF_ENABLED_SOFTIRQS		(1 << LOCK_ENABLED_SOFTIRQS)

#define LOCKF_ENABLED_IRQS (LOCKF_ENABLED_HARDIRQS | LOCKF_ENABLED_SOFTIRQS)
#define LOCKF_USED_IN_IRQ (LOCKF_USED_IN_HARDIRQ | LOCKF_USED_IN_SOFTIRQ)

#define LOCKF_USED_IN_HARDIRQ_READ	(1 << LOCK_USED_IN_HARDIRQ_READ)
#define LOCKF_USED_IN_SOFTIRQ_READ	(1 << LOCK_USED_IN_SOFTIRQ_READ)
#define LOCKF_ENABLED_HARDIRQS_READ	(1 << LOCK_ENABLED_HARDIRQS_READ)
#define LOCKF_ENABLED_SOFTIRQS_READ	(1 << LOCK_ENABLED_SOFTIRQS_READ)

#define LOCKF_ENABLED_IRQS_READ \
		(LOCKF_ENABLED_HARDIRQS_READ | LOCKF_ENABLED_SOFTIRQS_READ)
#define LOCKF_USED_IN_IRQ_READ \
		(LOCKF_USED_IN_HARDIRQ_READ | LOCKF_USED_IN_SOFTIRQ_READ)

#define MAX_LOCKDEP_SUBCLASSES		8UL

/*
 * 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.)
 */
struct lockdep_subclass_key {
	char __one_byte;
} __attribute__ ((__packed__));

struct lock_class_key {
	struct lockdep_subclass_key	subkeys[MAX_LOCKDEP_SUBCLASSES];
};

/*
 * The lock-class itself:
 */
struct lock_class {
	/*
	 * class-hash:
	 */
	struct list_head		hash_entry;

	/*
	 * global list of all lock-classes:
	 */
	struct list_head		lock_entry;

	struct lockdep_subclass_key	*key;
	unsigned int			subclass;

	/*
	 * IRQ/softirq usage tracking bits:
	 */
	unsigned long			usage_mask;
	struct stack_trace		usage_traces[LOCK_USAGE_STATES];

	/*
	 * These fields represent a directed graph of lock dependencies,
	 * to every node we attach a list of "forward" and a list of
	 * "backward" graph nodes.
	 */
	struct list_head		locks_after, locks_before;

	/*
	 * Generation counter, when doing certain classes of graph walking,
	 * to ensure that we check one node only once:
	 */
	unsigned int			version;

	/*
	 * Statistics counter:
	 */
	unsigned long			ops;

	const char			*name;
	int				name_version;
};

/*
 * Map the lock object (the lock instance) to the lock-class object.
 * This is embedded into specific lock instances:
 */
struct lockdep_map {
	struct lock_class_key		*key;
	struct lock_class		*class_cache;
	const char			*name;
};

/*
 * Every lock has a list of other locks that were taken after it.
 * We only grow the list, never remove from it:
 */
struct lock_list {
	struct list_head		entry;
	struct lock_class		*class;
	struct stack_trace		trace;
};

/*
 * We record lock dependency chains, so that we can cache them:
 */
struct lock_chain {
	struct list_head		entry;
	u64				chain_key;
};

struct held_lock {
	/*
	 * One-way hash of the dependency chain up to this point. We
	 * hash the hashes step by step as the dependency chain grows.
	 *
	 * We use it for dependency-caching and we skip detection
	 * passes and dependency-updates if there is a cache-hit, so
	 * it is absolutely critical for 100% coverage of the validator
	 * to have a unique key value for every unique dependency path
	 * that can occur in the system, to make a unique hash value
	 * as likely as possible - hence the 64-bit width.
	 *
	 * The task struct holds the current hash value (initialized
	 * with zero), here we store the previous hash value:
	 */
	u64				prev_chain_key;
	struct lock_class		*class;
	unsigned long			acquire_ip;
	struct lockdep_map		*instance;

	/*
	 * The lock-stack is unified in that the lock chains of interrupt
	 * contexts nest ontop of process context chains, but we 'separate'
	 * the hashes by starting with 0 if we cross into an interrupt
	 * context, and we also keep do not add cross-context lock
	 * dependencies - the lock usage graph walking covers that area
	 * anyway, and we'd just unnecessarily increase the number of
	 * dependencies otherwise. [Note: hardirq and softirq contexts
	 * are separated from each other too.]
	 *
	 * The following field is used to detect when we cross into an
	 * interrupt context:
	 */
	int				irq_context;
	int				trylock;
	int				read;
	int				check;
	int				hardirqs_off;
};

/*
 * Initialization, self-test and debugging-output methods:
 */
extern void lockdep_init(void);
extern void lockdep_info(void);
extern void lockdep_reset(void);
extern void lockdep_reset_lock(struct lockdep_map *lock);
extern void lockdep_free_key_range(void *start, unsigned long size);

extern void lockdep_off(void);
extern void lockdep_on(void);
extern int lockdep_internal(void);

/*
 * These methods are used by specific locking variants (spinlocks,
 * rwlocks, mutexes and rwsems) to pass init/acquire/release events
 * to lockdep:
 */

extern void lockdep_init_map(struct lockdep_map *lock, const char *name,
			     struct lock_class_key *key, int subclass);

/*
 * Reinitialize a lock key - for cases where there is special locking or
 * special initialization of locks so that the validator gets the scope
 * of dependencies wrong: they are either too broad (they need a class-split)
 * or they are too narrow (they suffer from a false class-split):
 */
#define lockdep_set_class(lock, key) \
		lockdep_init_map(&(lock)->dep_map, #key, key, 0)
#define lockdep_set_class_and_name(lock, key, name) \
		lockdep_init_map(&(lock)->dep_map, name, key, 0)
#define lockdep_set_class_and_subclass(lock, key, sub) \
		lockdep_init_map(&(lock)->dep_map, #key, key, sub)
#define lockdep_set_subclass(lock, sub)	\
		lockdep_init_map(&(lock)->dep_map, #lock, \
				 (lock)->dep_map.key, sub)

/*
 * Acquire a lock.
 *
 * Values for "read":
 *
 *   0: exclusive (write) acquire
 *   1: read-acquire (no recursion allowed)
 *   2: read-acquire with same-instance recursion allowed
 *
 * Values for check:
 *
 *   0: disabled
 *   1: simple checks (freeing, held-at-exit-time, etc.)
 *   2: full validation
 */
extern void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
			 int trylock, int read, int check, unsigned long ip);

extern void lock_release(struct lockdep_map *lock, int nested,
			 unsigned long ip);

# define INIT_LOCKDEP				.lockdep_recursion = 0,

#else /* !LOCKDEP */

static inline void lockdep_off(void)
{
}

static inline void lockdep_on(void)
{
}

static inline int lockdep_internal(void)
{
	return 0;
}

# define lock_acquire(l, s, t, r, c, i)		do { } while (0)
# define lock_release(l, n, i)			do { } while (0)
# define lockdep_init()				do { } while (0)
# define lockdep_info()				do { } while (0)
# define lockdep_init_map(lock, name, key, sub)	do { (void)(key); } while (0)
# define lockdep_set_class(lock, key)		do { (void)(key); } while (0)
# define lockdep_set_class_and_name(lock, key, name) \
		do { (void)(key); } while (0)
#define lockdep_set_class_and_subclass(lock, key, sub) \
		do { (void)(key); } while (0)
# define INIT_LOCKDEP
# define lockdep_reset()		do { debug_locks = 1; } while (0)
# define lockdep_free_key_range(start, size)	do { } while (0)
/*
 * The class key takes no space if lockdep is disabled:
 */
struct lock_class_key { };
#endif /* !LOCKDEP */

#if defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_GENERIC_HARDIRQS)
extern void early_init_irq_lock_class(void);
#else
# define early_init_irq_lock_class()		do { } while (0)
#endif

#ifdef CONFIG_TRACE_IRQFLAGS
extern void early_boot_irqs_off(void);
extern void early_boot_irqs_on(void);
#else
# define early_boot_irqs_off()			do { } while (0)
# define early_boot_irqs_on()			do { } while (0)
#endif

/*
 * For trivial one-depth nesting of a lock-class, the following
 * global define can be used. (Subsystems with multiple levels
 * of nesting should define their own lock-nesting subclasses.)
 */
#define SINGLE_DEPTH_NESTING			1

/*
 * Map the dependency ops to NOP or to real lockdep ops, depending
 * on the per lock-class debug mode:
 */

#ifdef CONFIG_DEBUG_LOCK_ALLOC
# ifdef CONFIG_PROVE_LOCKING
#  define spin_acquire(l, s, t, i)		lock_acquire(l, s, t, 0, 2, i)
# else
#  define spin_acquire(l, s, t, i)		lock_acquire(l, s, t, 0, 1, i)
# endif
# define spin_release(l, n, i)			lock_release(l, n, i)
#else
# define spin_acquire(l, s, t, i)		do { } while (0)
# define spin_release(l, n, i)			do { } while (0)
#endif

#ifdef CONFIG_DEBUG_LOCK_ALLOC
# ifdef CONFIG_PROVE_LOCKING
#  define rwlock_acquire(l, s, t, i)		lock_acquire(l, s, t, 0, 2, i)
#  define rwlock_acquire_read(l, s, t, i)	lock_acquire(l, s, t, 2, 2, i)
# else
#  define rwlock_acquire(l, s, t, i)		lock_acquire(l, s, t, 0, 1, i)
#  define rwlock_acquire_read(l, s, t, i)	lock_acquire(l, s, t, 2, 1, i)
# endif
# define rwlock_release(l, n, i)		lock_release(l, n, i)
#else
# define rwlock_acquire(l, s, t, i)		do { } while (0)
# define rwlock_acquire_read(l, s, t, i)	do { } while (0)
# define rwlock_release(l, n, i)		do { } while (0)
#endif

#ifdef CONFIG_DEBUG_LOCK_ALLOC
# ifdef CONFIG_PROVE_LOCKING
#  define mutex_acquire(l, s, t, i)		lock_acquire(l, s, t, 0, 2, i)
# else
#  define mutex_acquire(l, s, t, i)		lock_acquire(l, s, t, 0, 1, i)
# endif
# define mutex_release(l, n, i)			lock_release(l, n, i)
#else
# define mutex_acquire(l, s, t, i)		do { } while (0)
# define mutex_release(l, n, i)			do { } while (0)
#endif

#ifdef CONFIG_DEBUG_LOCK_ALLOC
# ifdef CONFIG_PROVE_LOCKING
#  define rwsem_acquire(l, s, t, i)		lock_acquire(l, s, t, 0, 2, i)
#  define rwsem_acquire_read(l, s, t, i)	lock_acquire(l, s, t, 1, 2, i)
# else
#  define rwsem_acquire(l, s, t, i)		lock_acquire(l, s, t, 0, 1, i)
#  define rwsem_acquire_read(l, s, t, i)	lock_acquire(l, s, t, 1, 1, i)
# endif
# define rwsem_release(l, n, i)			lock_release(l, n, i)
#else
# define rwsem_acquire(l, s, t, i)		do { } while (0)
# define rwsem_acquire_read(l, s, t, i)		do { } while (0)
# define rwsem_release(l, n, i)			do { } while (0)
#endif

#endif /* __LINUX_LOCKDEP_H */
Commit	Line	Data
fbb9ce95 IM	1	/*
	2	* Runtime locking correctness validator
	3	*
	4	* Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
	5	*
	6	* see Documentation/lockdep-design.txt for more details.
	7	*/
	8	#ifndef __LINUX_LOCKDEP_H
	9	#define __LINUX_LOCKDEP_H
	10
db0b0ead MT	11	#ifdef CONFIG_LOCKDEP
db0b0ead MT	12
fbb9ce95 IM	13	#include <linux/linkage.h>
	14	#include <linux/list.h>
	15	#include <linux/debug_locks.h>
	16	#include <linux/stacktrace.h>
	17
fbb9ce95 IM	18	/*
	19	* Lock-class usage-state bits:
	20	*/
	21	enum lock_usage_bit
	22	{
	23	LOCK_USED = 0,
	24	LOCK_USED_IN_HARDIRQ,
	25	LOCK_USED_IN_SOFTIRQ,
	26	LOCK_ENABLED_SOFTIRQS,
	27	LOCK_ENABLED_HARDIRQS,
	28	LOCK_USED_IN_HARDIRQ_READ,
	29	LOCK_USED_IN_SOFTIRQ_READ,
	30	LOCK_ENABLED_SOFTIRQS_READ,
	31	LOCK_ENABLED_HARDIRQS_READ,
	32	LOCK_USAGE_STATES
	33	};
	34
	35	/*
	36	* Usage-state bitmasks:
	37	*/
	38	#define LOCKF_USED (1 << LOCK_USED)
	39	#define LOCKF_USED_IN_HARDIRQ (1 << LOCK_USED_IN_HARDIRQ)
	40	#define LOCKF_USED_IN_SOFTIRQ (1 << LOCK_USED_IN_SOFTIRQ)
	41	#define LOCKF_ENABLED_HARDIRQS (1 << LOCK_ENABLED_HARDIRQS)
	42	#define LOCKF_ENABLED_SOFTIRQS (1 << LOCK_ENABLED_SOFTIRQS)
	43
	44	#define LOCKF_ENABLED_IRQS (LOCKF_ENABLED_HARDIRQS \| LOCKF_ENABLED_SOFTIRQS)
	45	#define LOCKF_USED_IN_IRQ (LOCKF_USED_IN_HARDIRQ \| LOCKF_USED_IN_SOFTIRQ)
	46
	47	#define LOCKF_USED_IN_HARDIRQ_READ (1 << LOCK_USED_IN_HARDIRQ_READ)
	48	#define LOCKF_USED_IN_SOFTIRQ_READ (1 << LOCK_USED_IN_SOFTIRQ_READ)
	49	#define LOCKF_ENABLED_HARDIRQS_READ (1 << LOCK_ENABLED_HARDIRQS_READ)
	50	#define LOCKF_ENABLED_SOFTIRQS_READ (1 << LOCK_ENABLED_SOFTIRQS_READ)
	51
	52	#define LOCKF_ENABLED_IRQS_READ \
	53	(LOCKF_ENABLED_HARDIRQS_READ \| LOCKF_ENABLED_SOFTIRQS_READ)
	54	#define LOCKF_USED_IN_IRQ_READ \
	55	(LOCKF_USED_IN_HARDIRQ_READ \| LOCKF_USED_IN_SOFTIRQ_READ)
	56
	57	#define MAX_LOCKDEP_SUBCLASSES 8UL
	58
	59	/*
	60	* Lock-classes are keyed via unique addresses, by embedding the
	61	* lockclass-key into the kernel (or module) .data section. (For
	62	* static locks we use the lock address itself as the key.)
	63	*/
	64	struct lockdep_subclass_key {
	65	char __one_byte;
	66	} __attribute__ ((__packed__));
	67
	68	struct lock_class_key {
	69	struct lockdep_subclass_key subkeys[MAX_LOCKDEP_SUBCLASSES];
	70	};
	71
	72	/*
	73	* The lock-class itself:
	74	*/
	75	struct lock_class {
	76	/*
	77	* class-hash:
	78	*/
	79	struct list_head hash_entry;
	80
	81	/*
82	* global list of all lock-classes:
83	*/
84	struct list_head lock_entry;
85
86	struct lockdep_subclass_key *key;
87	unsigned int subclass;
88
89	/*
90	* IRQ/softirq usage tracking bits:
91	*/
92	unsigned long usage_mask;
93	struct stack_trace usage_traces[LOCK_USAGE_STATES];
94
95	/*
96	* These fields represent a directed graph of lock dependencies,
97	* to every node we attach a list of "forward" and a list of
98	* "backward" graph nodes.
99	*/
100	struct list_head locks_after, locks_before;
101
102	/*
103	* Generation counter, when doing certain classes of graph walking,
104	* to ensure that we check one node only once:
105	*/
106	unsigned int version;
107
108	/*
109	* Statistics counter:
110	*/
111	unsigned long ops;
112
113	const char *name;
114	int name_version;
115	};
116
117	/*
118	* Map the lock object (the lock instance) to the lock-class object.
119	* This is embedded into specific lock instances:
120	*/
121	struct lockdep_map {
122	struct lock_class_key *key;
d6d897ce	123	struct lock_class *class_cache;
fbb9ce95 IM	124	const char *name;
	125	};
	126
	127	/*
	128	* Every lock has a list of other locks that were taken after it.
	129	* We only grow the list, never remove from it:
	130	*/
	131	struct lock_list {
	132	struct list_head entry;
	133	struct lock_class *class;
	134	struct stack_trace trace;
	135	};
	136
	137	/*
	138	* We record lock dependency chains, so that we can cache them:
	139	*/
	140	struct lock_chain {
	141	struct list_head entry;
	142	u64 chain_key;
	143	};
	144
	145	struct held_lock {
	146	/*
	147	* One-way hash of the dependency chain up to this point. We
	148	* hash the hashes step by step as the dependency chain grows.
	149	*
	150	* We use it for dependency-caching and we skip detection
	151	* passes and dependency-updates if there is a cache-hit, so
	152	* it is absolutely critical for 100% coverage of the validator
	153	* to have a unique key value for every unique dependency path
	154	* that can occur in the system, to make a unique hash value
	155	* as likely as possible - hence the 64-bit width.
	156	*
	157	* The task struct holds the current hash value (initialized
	158	* with zero), here we store the previous hash value:
	159	*/
	160	u64 prev_chain_key;
	161	struct lock_class *class;
	162	unsigned long acquire_ip;
	163	struct lockdep_map *instance;
	164
	165	/*
	166	* The lock-stack is unified in that the lock chains of interrupt
	167	* contexts nest ontop of process context chains, but we 'separate'
	168	* the hashes by starting with 0 if we cross into an interrupt
	169	* context, and we also keep do not add cross-context lock
	170	* dependencies - the lock usage graph walking covers that area
	171	* anyway, and we'd just unnecessarily increase the number of
	172	* dependencies otherwise. [Note: hardirq and softirq contexts
	173	* are separated from each other too.]
	174	*
	175	* The following field is used to detect when we cross into an
	176	* interrupt context:
	177	*/
	178	int irq_context;
	179	int trylock;
	180	int read;
	181	int check;
	182	int hardirqs_off;
	183	};
	184
	185	/*
	186	* Initialization, self-test and debugging-output methods:
	187	*/
188	extern void lockdep_init(void);
189	extern void lockdep_info(void);
190	extern void lockdep_reset(void);
191	extern void lockdep_reset_lock(struct lockdep_map *lock);
192	extern void lockdep_free_key_range(void *start, unsigned long size);
193
194	extern void lockdep_off(void);
195	extern void lockdep_on(void);
196	extern int lockdep_internal(void);
197
198	/*
199	* These methods are used by specific locking variants (spinlocks,
200	* rwlocks, mutexes and rwsems) to pass init/acquire/release events
201	* to lockdep:
202	*/
203
204	extern void lockdep_init_map(struct lockdep_map lock, const char name,
4dfbb9d8	205	struct lock_class_key *key, int subclass);
fbb9ce95 IM	206
	207	/*
	208	* Reinitialize a lock key - for cases where there is special locking or
	209	* special initialization of locks so that the validator gets the scope
	210	* of dependencies wrong: they are either too broad (they need a class-split)
	211	* or they are too narrow (they suffer from a false class-split):
	212	*/
	213	#define lockdep_set_class(lock, key) \
4dfbb9d8	214	lockdep_init_map(&(lock)->dep_map, #key, key, 0)
fbb9ce95	215	#define lockdep_set_class_and_name(lock, key, name) \
4dfbb9d8 PZ	216	lockdep_init_map(&(lock)->dep_map, name, key, 0)
	217	#define lockdep_set_class_and_subclass(lock, key, sub) \
	218	lockdep_init_map(&(lock)->dep_map, #key, key, sub)
	219	#define lockdep_set_subclass(lock, sub) \
	220	lockdep_init_map(&(lock)->dep_map, #lock, \
	221	(lock)->dep_map.key, sub)
fbb9ce95 IM	222
	223	/*
	224	* Acquire a lock.
	225	*
	226	* Values for "read":
	227	*
	228	* 0: exclusive (write) acquire
	229	* 1: read-acquire (no recursion allowed)
	230	* 2: read-acquire with same-instance recursion allowed
	231	*
	232	* Values for check:
	233	*
	234	* 0: disabled
	235	* 1: simple checks (freeing, held-at-exit-time, etc.)
	236	* 2: full validation
	237	*/
	238	extern void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
	239	int trylock, int read, int check, unsigned long ip);
	240
	241	extern void lock_release(struct lockdep_map *lock, int nested,
	242	unsigned long ip);
	243
	244	# define INIT_LOCKDEP .lockdep_recursion = 0,
	245
	246	#else /* !LOCKDEP */
	247
	248	static inline void lockdep_off(void)
	249	{
	250	}
	251
	252	static inline void lockdep_on(void)
	253	{
	254	}
	255
	256	static inline int lockdep_internal(void)
	257	{
	258	return 0;
	259	}
	260
	261	# define lock_acquire(l, s, t, r, c, i) do { } while (0)
	262	# define lock_release(l, n, i) do { } while (0)
	263	# define lockdep_init() do { } while (0)
	264	# define lockdep_info() do { } while (0)
4dfbb9d8	265	# define lockdep_init_map(lock, name, key, sub) do { (void)(key); } while (0)
fbb9ce95 IM	266	# define lockdep_set_class(lock, key) do { (void)(key); } while (0)
	267	# define lockdep_set_class_and_name(lock, key, name) \
	268	do { (void)(key); } while (0)
4dfbb9d8 PZ	269	#define lockdep_set_class_and_subclass(lock, key, sub) \
4dfbb9d8 PZ	270	do { (void)(key); } while (0)
fbb9ce95 IM	271	# define INIT_LOCKDEP
	272	# define lockdep_reset() do { debug_locks = 1; } while (0)
	273	# define lockdep_free_key_range(start, size) do { } while (0)
	274	/*
	275	* The class key takes no space if lockdep is disabled:
	276	*/
	277	struct lock_class_key { };
	278	#endif /* !LOCKDEP */
	279
243c7621 IM	280	#if defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_GENERIC_HARDIRQS)
	281	extern void early_init_irq_lock_class(void);
	282	#else
	283	# define early_init_irq_lock_class() do { } while (0)
	284	#endif
	285
fbb9ce95 IM	286	#ifdef CONFIG_TRACE_IRQFLAGS
	287	extern void early_boot_irqs_off(void);
	288	extern void early_boot_irqs_on(void);
	289	#else
	290	# define early_boot_irqs_off() do { } while (0)
	291	# define early_boot_irqs_on() do { } while (0)
	292	#endif
	293
	294	/*
	295	* For trivial one-depth nesting of a lock-class, the following
	296	* global define can be used. (Subsystems with multiple levels
	297	* of nesting should define their own lock-nesting subclasses.)
	298	*/
	299	#define SINGLE_DEPTH_NESTING 1
	300
	301	/*
	302	* Map the dependency ops to NOP or to real lockdep ops, depending
	303	* on the per lock-class debug mode:
	304	*/
	305
	306	#ifdef CONFIG_DEBUG_LOCK_ALLOC
	307	# ifdef CONFIG_PROVE_LOCKING
	308	# define spin_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, i)
	309	# else
	310	# define spin_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, i)
	311	# endif
	312	# define spin_release(l, n, i) lock_release(l, n, i)
	313	#else
	314	# define spin_acquire(l, s, t, i) do { } while (0)
	315	# define spin_release(l, n, i) do { } while (0)
	316	#endif
	317
	318	#ifdef CONFIG_DEBUG_LOCK_ALLOC
	319	# ifdef CONFIG_PROVE_LOCKING
	320	# define rwlock_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, i)
	321	# define rwlock_acquire_read(l, s, t, i) lock_acquire(l, s, t, 2, 2, i)
	322	# else
	323	# define rwlock_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, i)
	324	# define rwlock_acquire_read(l, s, t, i) lock_acquire(l, s, t, 2, 1, i)
	325	# endif
	326	# define rwlock_release(l, n, i) lock_release(l, n, i)
	327	#else
	328	# define rwlock_acquire(l, s, t, i) do { } while (0)
	329	# define rwlock_acquire_read(l, s, t, i) do { } while (0)
	330	# define rwlock_release(l, n, i) do { } while (0)
	331	#endif
	332
	333	#ifdef CONFIG_DEBUG_LOCK_ALLOC
	334	# ifdef CONFIG_PROVE_LOCKING
	335	# define mutex_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, i)
	336	# else
	337	# define mutex_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, i)
	338	# endif
	339	# define mutex_release(l, n, i) lock_release(l, n, i)
	340	#else
	341	# define mutex_acquire(l, s, t, i) do { } while (0)
	342	# define mutex_release(l, n, i) do { } while (0)
	343	#endif
	344
	345	#ifdef CONFIG_DEBUG_LOCK_ALLOC
	346	# ifdef CONFIG_PROVE_LOCKING
	347	# define rwsem_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, i)
	348	# define rwsem_acquire_read(l, s, t, i) lock_acquire(l, s, t, 1, 2, i)
	349	# else
350	# define rwsem_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, i)
351	# define rwsem_acquire_read(l, s, t, i) lock_acquire(l, s, t, 1, 1, i)
352	# endif
353	# define rwsem_release(l, n, i) lock_release(l, n, i)
354	#else
355	# define rwsem_acquire(l, s, t, i) do { } while (0)
356	# define rwsem_acquire_read(l, s, t, i) do { } while (0)
357	# define rwsem_release(l, n, i) do { } while (0)
358	#endif
359
360	#endif /* __LINUX_LOCKDEP_H */