Merge master.kernel.org:/home/rmk/linux-2.6-arm
[linux-2.6.git] / kernel / lockdep_internals.h
1 /*
2  * kernel/lockdep_internals.h
3  *
4  * Runtime locking correctness validator
5  *
6  * lockdep subsystem internal functions and variables.
7  */
8
9 /*
10  * Lock-class usage-state bits:
11  */
12 enum lock_usage_bit {
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,
21         LOCK_USAGE_STATES
22 };
23
24 /*
25  * Usage-state bitmasks:
26  */
27 #define __LOCKF(__STATE)        LOCKF_##__STATE = (1 << LOCK_##__STATE),
28
29 enum {
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 };
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
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
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  */
57 #define MAX_LOCKDEP_ENTRIES     16384UL
58
59 #define MAX_LOCKDEP_CHAINS_BITS 15
60 #define MAX_LOCKDEP_CHAINS      (1UL << MAX_LOCKDEP_CHAINS_BITS)
61
62 #define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5)
63
64 /*
65  * Stack-trace: tightly packed array of stack backtrace
66  * addresses. Protected by the hash_lock.
67  */
68 #define MAX_STACK_TRACE_ENTRIES 262144UL
69
70 extern struct list_head all_lock_classes;
71 extern struct lock_chain lock_chains[];
72
73 #define LOCK_USAGE_CHARS (1+LOCK_USAGE_STATES/2)
74
75 extern void get_usage_chars(struct lock_class *class,
76                             char usage[LOCK_USAGE_CHARS]);
77
78 extern const char * __get_key_name(struct lockdep_subclass_key *key, char *str);
79
80 struct lock_class *lock_chain_get_class(struct lock_chain *chain, int i);
81
82 extern unsigned long nr_lock_classes;
83 extern unsigned long nr_list_entries;
84 extern unsigned long nr_lock_chains;
85 extern int nr_chain_hlocks;
86 extern unsigned long nr_stack_trace_entries;
87
88 extern unsigned int nr_hardirq_chains;
89 extern unsigned int nr_softirq_chains;
90 extern unsigned int nr_process_chains;
91 extern unsigned int max_lockdep_depth;
92 extern unsigned int max_recursion_depth;
93
94 extern unsigned int max_bfs_queue_depth;
95
96 #ifdef CONFIG_PROVE_LOCKING
97 extern unsigned long lockdep_count_forward_deps(struct lock_class *);
98 extern unsigned long lockdep_count_backward_deps(struct lock_class *);
99 #else
100 static inline unsigned long
101 lockdep_count_forward_deps(struct lock_class *class)
102 {
103         return 0;
104 }
105 static inline unsigned long
106 lockdep_count_backward_deps(struct lock_class *class)
107 {
108         return 0;
109 }
110 #endif
111
112 #ifdef CONFIG_DEBUG_LOCKDEP
113 /*
114  * Various lockdep statistics:
115  */
116 extern atomic_t chain_lookup_hits;
117 extern atomic_t chain_lookup_misses;
118 extern atomic_t hardirqs_on_events;
119 extern atomic_t hardirqs_off_events;
120 extern atomic_t redundant_hardirqs_on;
121 extern atomic_t redundant_hardirqs_off;
122 extern atomic_t softirqs_on_events;
123 extern atomic_t softirqs_off_events;
124 extern atomic_t redundant_softirqs_on;
125 extern atomic_t redundant_softirqs_off;
126 extern atomic_t nr_unused_locks;
127 extern atomic_t nr_cyclic_checks;
128 extern atomic_t nr_cyclic_check_recursions;
129 extern atomic_t nr_find_usage_forwards_checks;
130 extern atomic_t nr_find_usage_forwards_recursions;
131 extern atomic_t nr_find_usage_backwards_checks;
132 extern 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