1 /*
2 * kernel/lockdep_internals.h
3 *
4 * Runtime locking correctness validator
5 *
6 * lockdep subsystem internal functions and variables.
7 */
8
9 /*
10 * MAX_LOCKDEP_ENTRIES is the maximum number of lock dependencies
11 * we track.
12 *
13 * We use the per-lock dependency maps in two ways: we grow it by adding
14 * every to-be-taken lock to all currently held lock's own dependency
15 * table (if it's not there yet), and we check it for lock order
16 * conflicts and deadlocks.
17 */
18 #define MAX_LOCKDEP_ENTRIES 16384UL
19
20 #define MAX_LOCKDEP_KEYS_BITS 11
21 #define MAX_LOCKDEP_KEYS (1UL << MAX_LOCKDEP_KEYS_BITS)
22
23 #define MAX_LOCKDEP_CHAINS_BITS 15
24 #define MAX_LOCKDEP_CHAINS (1UL << MAX_LOCKDEP_CHAINS_BITS)
25
26 /*
27 * Stack-trace: tightly packed array of stack backtrace
28 * addresses. Protected by the hash_lock.
29 */
30 #define MAX_STACK_TRACE_ENTRIES 262144UL
31
32 extern struct list_head all_lock_classes;
33
34 extern void
35 get_usage_chars(struct lock_class *class, char *c1, char *c2, char *c3, char *c4);
36
37 extern const char * __get_key_name(struct lockdep_subclass_key *key, char *str);
38
39 extern unsigned long nr_lock_classes;
40 extern unsigned long nr_list_entries;
41 extern unsigned long nr_lock_chains;
42 extern unsigned long nr_stack_trace_entries;
43
44 extern unsigned int nr_hardirq_chains;
45 extern unsigned int nr_softirq_chains;
46 extern unsigned int nr_process_chains;
47 extern unsigned int max_lockdep_depth;
48 extern unsigned int max_recursion_depth;
49
50 #ifdef CONFIG_DEBUG_LOCKDEP
51 /*
52 * Various lockdep statistics:
53 */
54 extern atomic_t chain_lookup_hits;
55 extern atomic_t chain_lookup_misses;
56 extern atomic_t hardirqs_on_events;
57 extern atomic_t hardirqs_off_events;
58 extern atomic_t redundant_hardirqs_on;
59 extern atomic_t redundant_hardirqs_off;
60 extern atomic_t softirqs_on_events;
61 extern atomic_t softirqs_off_events;
62 extern atomic_t redundant_softirqs_on;
63 extern atomic_t redundant_softirqs_off;
64 extern atomic_t nr_unused_locks;
65 extern atomic_t nr_cyclic_checks;
66 extern atomic_t nr_cyclic_check_recursions;
67 extern atomic_t nr_find_usage_forwards_checks;
68 extern atomic_t nr_find_usage_forwards_recursions;
69 extern atomic_t nr_find_usage_backwards_checks;
70 extern atomic_t nr_find_usage_backwards_recursions;
71 # define debug_atomic_inc(ptr) atomic_inc(ptr)
72 # define debug_atomic_dec(ptr) atomic_dec(ptr)
73 # define debug_atomic_read(ptr) atomic_read(ptr)
74 #else
75 # define debug_atomic_inc(ptr) do { } while (0)
76 # define debug_atomic_dec(ptr) do { } while (0)
77 # define debug_atomic_read(ptr) 0
78 #endif
79
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