ARM: Merge for-2635/samsung-hwmon
[linux-2.6-block.git] / kernel / lockdep_internals.h
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1/*
2 * kernel/lockdep_internals.h
3 *
4 * Runtime locking correctness validator
5 *
6 * lockdep subsystem internal functions and variables.
7 */
8
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9/*
10 * Lock-class usage-state bits:
11 */
12enum lock_usage_bit {
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13#define LOCKDEP_STATE(__STATE) \
14 LOCK_USED_IN_##__STATE, \
15 LOCK_USED_IN_##__STATE##_READ, \
16 LOCK_ENABLED_##__STATE, \
17 LOCK_ENABLED_##__STATE##_READ,
18#include "lockdep_states.h"
19#undef LOCKDEP_STATE
20 LOCK_USED,
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21 LOCK_USAGE_STATES
22};
23
24/*
25 * Usage-state bitmasks:
26 */
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27#define __LOCKF(__STATE) LOCKF_##__STATE = (1 << LOCK_##__STATE),
28
29enum {
30#define LOCKDEP_STATE(__STATE) \
31 __LOCKF(USED_IN_##__STATE) \
32 __LOCKF(USED_IN_##__STATE##_READ) \
33 __LOCKF(ENABLED_##__STATE) \
34 __LOCKF(ENABLED_##__STATE##_READ)
35#include "lockdep_states.h"
36#undef LOCKDEP_STATE
37 __LOCKF(USED)
38};
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39
40#define LOCKF_ENABLED_IRQ (LOCKF_ENABLED_HARDIRQ | LOCKF_ENABLED_SOFTIRQ)
41#define LOCKF_USED_IN_IRQ (LOCKF_USED_IN_HARDIRQ | LOCKF_USED_IN_SOFTIRQ)
42
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43#define LOCKF_ENABLED_IRQ_READ \
44 (LOCKF_ENABLED_HARDIRQ_READ | LOCKF_ENABLED_SOFTIRQ_READ)
45#define LOCKF_USED_IN_IRQ_READ \
46 (LOCKF_USED_IN_HARDIRQ_READ | LOCKF_USED_IN_SOFTIRQ_READ)
47
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48/*
49 * MAX_LOCKDEP_ENTRIES is the maximum number of lock dependencies
50 * we track.
51 *
52 * We use the per-lock dependency maps in two ways: we grow it by adding
53 * every to-be-taken lock to all currently held lock's own dependency
54 * table (if it's not there yet), and we check it for lock order
55 * conflicts and deadlocks.
56 */
d80c19df 57#define MAX_LOCKDEP_ENTRIES 16384UL
fbb9ce95 58
d80c19df 59#define MAX_LOCKDEP_CHAINS_BITS 15
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60#define MAX_LOCKDEP_CHAINS (1UL << MAX_LOCKDEP_CHAINS_BITS)
61
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62#define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5)
63
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64/*
65 * Stack-trace: tightly packed array of stack backtrace
66 * addresses. Protected by the hash_lock.
67 */
9bb25bf3 68#define MAX_STACK_TRACE_ENTRIES 262144UL
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69
70extern struct list_head all_lock_classes;
443cd507 71extern struct lock_chain lock_chains[];
fbb9ce95 72
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73#define LOCK_USAGE_CHARS (1+LOCK_USAGE_STATES/2)
74
75extern void get_usage_chars(struct lock_class *class,
76 char usage[LOCK_USAGE_CHARS]);
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77
78extern const char * __get_key_name(struct lockdep_subclass_key *key, char *str);
79
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80struct lock_class *lock_chain_get_class(struct lock_chain *chain, int i);
81
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82extern unsigned long nr_lock_classes;
83extern unsigned long nr_list_entries;
84extern unsigned long nr_lock_chains;
cd1a28e8 85extern int nr_chain_hlocks;
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86extern unsigned long nr_stack_trace_entries;
87
88extern unsigned int nr_hardirq_chains;
89extern unsigned int nr_softirq_chains;
90extern unsigned int nr_process_chains;
91extern unsigned int max_lockdep_depth;
92extern unsigned int max_recursion_depth;
93
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94extern unsigned int max_bfs_queue_depth;
95
d6672c50 96#ifdef CONFIG_PROVE_LOCKING
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97extern unsigned long lockdep_count_forward_deps(struct lock_class *);
98extern unsigned long lockdep_count_backward_deps(struct lock_class *);
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99#else
100static inline unsigned long
101lockdep_count_forward_deps(struct lock_class *class)
102{
103 return 0;
104}
105static inline unsigned long
106lockdep_count_backward_deps(struct lock_class *class)
107{
108 return 0;
109}
110#endif
419ca3f1 111
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112#ifdef CONFIG_DEBUG_LOCKDEP
113/*
114 * Various lockdep statistics:
115 */
116extern atomic_t chain_lookup_hits;
117extern atomic_t chain_lookup_misses;
118extern atomic_t hardirqs_on_events;
119extern atomic_t hardirqs_off_events;
120extern atomic_t redundant_hardirqs_on;
121extern atomic_t redundant_hardirqs_off;
122extern atomic_t softirqs_on_events;
123extern atomic_t softirqs_off_events;
124extern atomic_t redundant_softirqs_on;
125extern atomic_t redundant_softirqs_off;
126extern atomic_t nr_unused_locks;
127extern atomic_t nr_cyclic_checks;
128extern atomic_t nr_cyclic_check_recursions;
129extern atomic_t nr_find_usage_forwards_checks;
130extern atomic_t nr_find_usage_forwards_recursions;
131extern atomic_t nr_find_usage_backwards_checks;
132extern atomic_t nr_find_usage_backwards_recursions;
133# define debug_atomic_inc(ptr) atomic_inc(ptr)
134# define debug_atomic_dec(ptr) atomic_dec(ptr)
135# define debug_atomic_read(ptr) atomic_read(ptr)
136#else
137# define debug_atomic_inc(ptr) do { } while (0)
138# define debug_atomic_dec(ptr) do { } while (0)
139# define debug_atomic_read(ptr) 0
140#endif