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review.evervolv.com / android_kernel_oneplus_msm8996 / 7530c20f2ab2f55b99c666b03728df7d8b59a80c / . / kernel / lockdep_internals.h
blob: 8ce09bc4613dc1ea72566bb0a2a7822ac802930f [file] [log] [blame]
Ingo Molnarfbb9ce952006-07-03 00:24:50 -0700[diff] [blame]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 8192UL
19
20#define MAX_LOCKDEP_KEYS_BITS 11
21#define MAX_LOCKDEP_KEYS (1UL << MAX_LOCKDEP_KEYS_BITS)
22
Ingo Molnar50cc6702006-12-06 20:39:30 -0800[diff] [blame]23#define MAX_LOCKDEP_CHAINS_BITS 14
Ingo Molnarfbb9ce952006-07-03 00:24:50 -0700[diff] [blame]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 */
Ingo Molnar9bb25bf2006-09-12 20:35:50 -0700[diff] [blame]30#define MAX_STACK_TRACE_ENTRIES 262144UL
Ingo Molnarfbb9ce952006-07-03 00:24:50 -0700[diff] [blame]31
32extern struct list_head all_lock_classes;
33
34extern void
35get_usage_chars(struct lock_class *class, char *c1, char *c2, char *c3, char *c4);
36
37extern const char * __get_key_name(struct lockdep_subclass_key *key, char *str);
38
39extern unsigned long nr_lock_classes;
40extern unsigned long nr_list_entries;
41extern unsigned long nr_lock_chains;
42extern unsigned long nr_stack_trace_entries;
43
44extern unsigned int nr_hardirq_chains;
45extern unsigned int nr_softirq_chains;
46extern unsigned int nr_process_chains;
47extern unsigned int max_lockdep_depth;
48extern unsigned int max_recursion_depth;
49
50#ifdef CONFIG_DEBUG_LOCKDEP
51/*
52 * Various lockdep statistics:
53 */
54extern atomic_t chain_lookup_hits;
55extern atomic_t chain_lookup_misses;
56extern atomic_t hardirqs_on_events;
57extern atomic_t hardirqs_off_events;
58extern atomic_t redundant_hardirqs_on;
59extern atomic_t redundant_hardirqs_off;
60extern atomic_t softirqs_on_events;
61extern atomic_t softirqs_off_events;
62extern atomic_t redundant_softirqs_on;
63extern atomic_t redundant_softirqs_off;
64extern atomic_t nr_unused_locks;
65extern atomic_t nr_cyclic_checks;
66extern atomic_t nr_cyclic_check_recursions;
67extern atomic_t nr_find_usage_forwards_checks;
68extern atomic_t nr_find_usage_forwards_recursions;
69extern atomic_t nr_find_usage_backwards_checks;
70extern 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