[linux.git] / include / linux / lockdep.h

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

struct task_struct;

#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;
	int				distance;
};

/*
 * 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);

/*
 * 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,

#define lockdep_depth(tsk)	(debug_locks ? (tsk)->lockdep_depth : 0)

#else /* !LOCKDEP */

static inline void lockdep_off(void)
{
}

static inline void lockdep_on(void)
{
}

# 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 lockdep_set_subclass(lock, sub)		do { } 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 { };

#define lockdep_depth(tsk)	(0)

#endif /* !LOCKDEP */

#if defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_GENERIC_HARDIRQS)
extern void early_init_irq_lock_class(void);
#else
static inline void early_init_irq_lock_class(void)
{
}
#endif

#ifdef CONFIG_TRACE_IRQFLAGS
extern void early_boot_irqs_off(void);
extern void early_boot_irqs_on(void);
extern void print_irqtrace_events(struct task_struct *curr);
#else
static inline void early_boot_irqs_off(void)
{
}
static inline void early_boot_irqs_on(void)
{
}
static inline void print_irqtrace_events(struct task_struct *curr)
{
}
#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 <[email protected]>
	5	*
	6	* see Documentation/lockdep-design.txt for more details.
	7	*/
	8	#ifndef __LINUX_LOCKDEP_H
	9	#define __LINUX_LOCKDEP_H
	10
a1e96b03 HC	11	struct task_struct;
a1e96b03 HC	12
db0b0ead MT	13	#ifdef CONFIG_LOCKDEP
db0b0ead MT	14
fbb9ce95 IM	15	#include <linux/linkage.h>
	16	#include <linux/list.h>
	17	#include <linux/debug_locks.h>
	18	#include <linux/stacktrace.h>
	19
fbb9ce95 IM	20	/*
	21	* Lock-class usage-state bits:
	22	*/
	23	enum lock_usage_bit
	24	{
	25	LOCK_USED = 0,
	26	LOCK_USED_IN_HARDIRQ,
	27	LOCK_USED_IN_SOFTIRQ,
	28	LOCK_ENABLED_SOFTIRQS,
	29	LOCK_ENABLED_HARDIRQS,
	30	LOCK_USED_IN_HARDIRQ_READ,
	31	LOCK_USED_IN_SOFTIRQ_READ,
	32	LOCK_ENABLED_SOFTIRQS_READ,
	33	LOCK_ENABLED_HARDIRQS_READ,
	34	LOCK_USAGE_STATES
	35	};
	36
	37	/*
	38	* Usage-state bitmasks:
	39	*/
	40	#define LOCKF_USED (1 << LOCK_USED)
	41	#define LOCKF_USED_IN_HARDIRQ (1 << LOCK_USED_IN_HARDIRQ)
	42	#define LOCKF_USED_IN_SOFTIRQ (1 << LOCK_USED_IN_SOFTIRQ)
	43	#define LOCKF_ENABLED_HARDIRQS (1 << LOCK_ENABLED_HARDIRQS)
	44	#define LOCKF_ENABLED_SOFTIRQS (1 << LOCK_ENABLED_SOFTIRQS)
	45
	46	#define LOCKF_ENABLED_IRQS (LOCKF_ENABLED_HARDIRQS \| LOCKF_ENABLED_SOFTIRQS)
	47	#define LOCKF_USED_IN_IRQ (LOCKF_USED_IN_HARDIRQ \| LOCKF_USED_IN_SOFTIRQ)
	48
	49	#define LOCKF_USED_IN_HARDIRQ_READ (1 << LOCK_USED_IN_HARDIRQ_READ)
	50	#define LOCKF_USED_IN_SOFTIRQ_READ (1 << LOCK_USED_IN_SOFTIRQ_READ)
	51	#define LOCKF_ENABLED_HARDIRQS_READ (1 << LOCK_ENABLED_HARDIRQS_READ)
	52	#define LOCKF_ENABLED_SOFTIRQS_READ (1 << LOCK_ENABLED_SOFTIRQS_READ)
	53
	54	#define LOCKF_ENABLED_IRQS_READ \
	55	(LOCKF_ENABLED_HARDIRQS_READ \| LOCKF_ENABLED_SOFTIRQS_READ)
	56	#define LOCKF_USED_IN_IRQ_READ \
	57	(LOCKF_USED_IN_HARDIRQ_READ \| LOCKF_USED_IN_SOFTIRQ_READ)
	58
	59	#define MAX_LOCKDEP_SUBCLASSES 8UL
	60
	61	/*
	62	* Lock-classes are keyed via unique addresses, by embedding the
	63	* lockclass-key into the kernel (or module) .data section. (For
	64	* static locks we use the lock address itself as the key.)
	65	*/
	66	struct lockdep_subclass_key {
	67	char __one_byte;
	68	} __attribute__ ((__packed__));
	69
	70	struct lock_class_key {
	71	struct lockdep_subclass_key subkeys[MAX_LOCKDEP_SUBCLASSES];
	72	};
	73
	74	/*
	75	* The lock-class itself:
	76	*/
	77	struct lock_class {
	78	/*
	79	* class-hash:
	80	*/
	81	struct list_head hash_entry;
	82
	83	/*
84	* global list of all lock-classes:
85	*/
86	struct list_head lock_entry;
87
88	struct lockdep_subclass_key *key;
89	unsigned int subclass;
90
91	/*
92	* IRQ/softirq usage tracking bits:
93	*/
94	unsigned long usage_mask;
95	struct stack_trace usage_traces[LOCK_USAGE_STATES];
96
97	/*
98	* These fields represent a directed graph of lock dependencies,
99	* to every node we attach a list of "forward" and a list of
100	* "backward" graph nodes.
101	*/
102	struct list_head locks_after, locks_before;
103
104	/*
105	* Generation counter, when doing certain classes of graph walking,
106	* to ensure that we check one node only once:
107	*/
108	unsigned int version;
109
110	/*
111	* Statistics counter:
112	*/
113	unsigned long ops;
114
115	const char *name;
116	int name_version;
117	};
118
119	/*
120	* Map the lock object (the lock instance) to the lock-class object.
121	* This is embedded into specific lock instances:
122	*/
123	struct lockdep_map {
124	struct lock_class_key *key;
d6d897ce	125	struct lock_class *class_cache;
fbb9ce95 IM	126	const char *name;
	127	};
	128
	129	/*
	130	* Every lock has a list of other locks that were taken after it.
	131	* We only grow the list, never remove from it:
	132	*/
	133	struct lock_list {
	134	struct list_head entry;
	135	struct lock_class *class;
	136	struct stack_trace trace;
068135e6	137	int distance;
fbb9ce95 IM	138	};
	139
	140	/*
	141	* We record lock dependency chains, so that we can cache them:
	142	*/
	143	struct lock_chain {
	144	struct list_head entry;
	145	u64 chain_key;
	146	};
	147
	148	struct held_lock {
	149	/*
	150	* One-way hash of the dependency chain up to this point. We
	151	* hash the hashes step by step as the dependency chain grows.
	152	*
	153	* We use it for dependency-caching and we skip detection
	154	* passes and dependency-updates if there is a cache-hit, so
	155	* it is absolutely critical for 100% coverage of the validator
	156	* to have a unique key value for every unique dependency path
	157	* that can occur in the system, to make a unique hash value
	158	* as likely as possible - hence the 64-bit width.
	159	*
	160	* The task struct holds the current hash value (initialized
	161	* with zero), here we store the previous hash value:
	162	*/
	163	u64 prev_chain_key;
	164	struct lock_class *class;
	165	unsigned long acquire_ip;
	166	struct lockdep_map *instance;
	167
	168	/*
	169	* The lock-stack is unified in that the lock chains of interrupt
	170	* contexts nest ontop of process context chains, but we 'separate'
	171	* the hashes by starting with 0 if we cross into an interrupt
	172	* context, and we also keep do not add cross-context lock
	173	* dependencies - the lock usage graph walking covers that area
	174	* anyway, and we'd just unnecessarily increase the number of
	175	* dependencies otherwise. [Note: hardirq and softirq contexts
	176	* are separated from each other too.]
	177	*
	178	* The following field is used to detect when we cross into an
	179	* interrupt context:
	180	*/
	181	int irq_context;
	182	int trylock;
	183	int read;
	184	int check;
	185	int hardirqs_off;
	186	};
	187
	188	/*
	189	* Initialization, self-test and debugging-output methods:
	190	*/
	191	extern void lockdep_init(void);
	192	extern void lockdep_info(void);
	193	extern void lockdep_reset(void);
	194	extern void lockdep_reset_lock(struct lockdep_map *lock);
	195	extern void lockdep_free_key_range(void *start, unsigned long size);
	196
	197	extern void lockdep_off(void);
	198	extern void lockdep_on(void);
fbb9ce95 IM	199
	200	/*
	201	* These methods are used by specific locking variants (spinlocks,
	202	* rwlocks, mutexes and rwsems) to pass init/acquire/release events
	203	* to lockdep:
	204	*/
	205
	206	extern void lockdep_init_map(struct lockdep_map lock, const char name,
4dfbb9d8	207	struct lock_class_key *key, int subclass);
fbb9ce95 IM	208
	209	/*
	210	* Reinitialize a lock key - for cases where there is special locking or
	211	* special initialization of locks so that the validator gets the scope
	212	* of dependencies wrong: they are either too broad (they need a class-split)
	213	* or they are too narrow (they suffer from a false class-split):
	214	*/
	215	#define lockdep_set_class(lock, key) \
4dfbb9d8	216	lockdep_init_map(&(lock)->dep_map, #key, key, 0)
fbb9ce95	217	#define lockdep_set_class_and_name(lock, key, name) \
4dfbb9d8 PZ	218	lockdep_init_map(&(lock)->dep_map, name, key, 0)
	219	#define lockdep_set_class_and_subclass(lock, key, sub) \
	220	lockdep_init_map(&(lock)->dep_map, #key, key, sub)
	221	#define lockdep_set_subclass(lock, sub) \
	222	lockdep_init_map(&(lock)->dep_map, #lock, \
	223	(lock)->dep_map.key, sub)
fbb9ce95 IM	224
	225	/*
	226	* Acquire a lock.
	227	*
	228	* Values for "read":
	229	*
	230	* 0: exclusive (write) acquire
	231	* 1: read-acquire (no recursion allowed)
	232	* 2: read-acquire with same-instance recursion allowed
	233	*
	234	* Values for check:
	235	*
	236	* 0: disabled
	237	* 1: simple checks (freeing, held-at-exit-time, etc.)
	238	* 2: full validation
	239	*/
	240	extern void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
	241	int trylock, int read, int check, unsigned long ip);
	242
	243	extern void lock_release(struct lockdep_map *lock, int nested,
	244	unsigned long ip);
	245
	246	# define INIT_LOCKDEP .lockdep_recursion = 0,
	247
e3a55fd1	248	#define lockdep_depth(tsk) (debug_locks ? (tsk)->lockdep_depth : 0)
d5abe669	249
fbb9ce95 IM	250	#else /* !LOCKDEP */
	251
	252	static inline void lockdep_off(void)
	253	{
	254	}
	255
	256	static inline void lockdep_on(void)
	257	{
	258	}
	259
fbb9ce95 IM	260	# define lock_acquire(l, s, t, r, c, i) do { } while (0)
	261	# define lock_release(l, n, i) do { } while (0)
	262	# define lockdep_init() do { } while (0)
	263	# define lockdep_info() do { } while (0)
4dfbb9d8	264	# define lockdep_init_map(lock, name, key, sub) do { (void)(key); } while (0)
fbb9ce95 IM	265	# define lockdep_set_class(lock, key) do { (void)(key); } while (0)
	266	# define lockdep_set_class_and_name(lock, key, name) \
	267	do { (void)(key); } while (0)
4dfbb9d8 PZ	268	#define lockdep_set_class_and_subclass(lock, key, sub) \
4dfbb9d8 PZ	269	do { (void)(key); } while (0)
07646e21 AM	270	#define lockdep_set_subclass(lock, sub) do { } while (0)
07646e21 AM	271
fbb9ce95 IM	272	# define INIT_LOCKDEP
	273	# define lockdep_reset() do { debug_locks = 1; } while (0)
	274	# define lockdep_free_key_range(start, size) do { } while (0)
	275	/*
	276	* The class key takes no space if lockdep is disabled:
	277	*/
	278	struct lock_class_key { };
d5abe669 PZ	279
	280	#define lockdep_depth(tsk) (0)
	281
fbb9ce95 IM	282	#endif /* !LOCKDEP */
fbb9ce95 IM	283
243c7621 IM	284	#if defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_GENERIC_HARDIRQS)
	285	extern void early_init_irq_lock_class(void);
	286	#else
3117df04 IM	287	static inline void early_init_irq_lock_class(void)
	288	{
	289	}
243c7621 IM	290	#endif
243c7621 IM	291
fbb9ce95 IM	292	#ifdef CONFIG_TRACE_IRQFLAGS
	293	extern void early_boot_irqs_off(void);
	294	extern void early_boot_irqs_on(void);
3117df04	295	extern void print_irqtrace_events(struct task_struct *curr);
fbb9ce95	296	#else
3117df04 IM	297	static inline void early_boot_irqs_off(void)
	298	{
	299	}
	300	static inline void early_boot_irqs_on(void)
	301	{
	302	}
	303	static inline void print_irqtrace_events(struct task_struct *curr)
	304	{
	305	}
fbb9ce95 IM	306	#endif
	307
	308	/*
	309	* For trivial one-depth nesting of a lock-class, the following
	310	* global define can be used. (Subsystems with multiple levels
	311	* of nesting should define their own lock-nesting subclasses.)
	312	*/
	313	#define SINGLE_DEPTH_NESTING 1
	314
	315	/*
	316	* Map the dependency ops to NOP or to real lockdep ops, depending
	317	* on the per lock-class debug mode:
	318	*/
	319
	320	#ifdef CONFIG_DEBUG_LOCK_ALLOC
	321	# ifdef CONFIG_PROVE_LOCKING
	322	# define spin_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, i)
	323	# else
	324	# define spin_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, i)
	325	# endif
	326	# define spin_release(l, n, i) lock_release(l, n, i)
	327	#else
	328	# define spin_acquire(l, s, t, i) do { } while (0)
	329	# define spin_release(l, n, i) do { } while (0)
	330	#endif
	331
	332	#ifdef CONFIG_DEBUG_LOCK_ALLOC
	333	# ifdef CONFIG_PROVE_LOCKING
	334	# define rwlock_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, i)
	335	# define rwlock_acquire_read(l, s, t, i) lock_acquire(l, s, t, 2, 2, i)
	336	# else
	337	# define rwlock_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, i)
	338	# define rwlock_acquire_read(l, s, t, i) lock_acquire(l, s, t, 2, 1, i)
	339	# endif
	340	# define rwlock_release(l, n, i) lock_release(l, n, i)
	341	#else
	342	# define rwlock_acquire(l, s, t, i) do { } while (0)
	343	# define rwlock_acquire_read(l, s, t, i) do { } while (0)
	344	# define rwlock_release(l, n, i) do { } while (0)
	345	#endif
	346
	347	#ifdef CONFIG_DEBUG_LOCK_ALLOC
	348	# ifdef CONFIG_PROVE_LOCKING
	349	# define mutex_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, i)
	350	# else
	351	# define mutex_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, i)
	352	# endif
	353	# define mutex_release(l, n, i) lock_release(l, n, i)
	354	#else
	355	# define mutex_acquire(l, s, t, i) do { } while (0)
	356	# define mutex_release(l, n, i) do { } while (0)
	357	#endif
	358
	359	#ifdef CONFIG_DEBUG_LOCK_ALLOC
	360	# ifdef CONFIG_PROVE_LOCKING
	361	# define rwsem_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, i)
	362	# define rwsem_acquire_read(l, s, t, i) lock_acquire(l, s, t, 1, 2, i)
	363	# else
	364	# define rwsem_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, i)
	365	# define rwsem_acquire_read(l, s, t, i) lock_acquire(l, s, t, 1, 1, i)
	366	# endif
	367	# define rwsem_release(l, n, i) lock_release(l, n, i)
	368	#else
	369	# define rwsem_acquire(l, s, t, i) do { } while (0)
370	# define rwsem_acquire_read(l, s, t, i) do { } while (0)
371	# define rwsem_release(l, n, i) do { } while (0)
372	#endif
373
374	#endif /* __LINUX_LOCKDEP_H */