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gerrit-public.fairphone.software / kernel / msm-4.9 / 6d7f2caa77994e9c2d3cb648aa16f1e0c25b2af4 / . / kernel / lockdep_internals.h
blob: 56b196932c081e915568d4fef27a92c08e129758 [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
Ingo Molnar50cc6702006-12-06 20:39:30 -0800[diff] [blame]20#define MAX_LOCKDEP_CHAINS_BITS 14
Ingo Molnarfbb9ce952006-07-03 00:24:50 -0700[diff] [blame]21#define MAX_LOCKDEP_CHAINS (1UL << MAX_LOCKDEP_CHAINS_BITS)
22
Huang, Ying443cd502008-06-20 16:39:21 +0800[diff] [blame]23#define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5)
24
Ingo Molnarfbb9ce952006-07-03 00:24:50 -0700[diff] [blame]25/*
26 * Stack-trace: tightly packed array of stack backtrace
27 * addresses. Protected by the hash_lock.
28 */
Ingo Molnar9bb25bf2006-09-12 20:35:50 -0700[diff] [blame]29#define MAX_STACK_TRACE_ENTRIES 262144UL
Ingo Molnarfbb9ce952006-07-03 00:24:50 -0700[diff] [blame]30
31extern struct list_head all_lock_classes;
Huang, Ying443cd502008-06-20 16:39:21 +0800[diff] [blame]32extern struct lock_chain lock_chains[];
Ingo Molnarfbb9ce952006-07-03 00:24:50 -0700[diff] [blame]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
Huang, Ying443cd502008-06-20 16:39:21 +0800[diff] [blame]39struct lock_class *lock_chain_get_class(struct lock_chain *chain, int i);
40
Ingo Molnarfbb9ce952006-07-03 00:24:50 -0700[diff] [blame]41extern unsigned long nr_lock_classes;
42extern unsigned long nr_list_entries;
43extern unsigned long nr_lock_chains;
Huang, Yingcd1a28e2008-06-23 11:20:54 +0800[diff] [blame]44extern int nr_chain_hlocks;
Ingo Molnarfbb9ce952006-07-03 00:24:50 -0700[diff] [blame]45extern unsigned long nr_stack_trace_entries;
46
47extern unsigned int nr_hardirq_chains;
48extern unsigned int nr_softirq_chains;
49extern unsigned int nr_process_chains;
50extern unsigned int max_lockdep_depth;
51extern unsigned int max_recursion_depth;
52
Ingo Molnard6672c52008-08-01 11:23:50 +0200[diff] [blame]53#ifdef CONFIG_PROVE_LOCKING
David Miller419ca3f2008-07-29 21:45:03 -0700[diff] [blame]54extern unsigned long lockdep_count_forward_deps(struct lock_class *);
55extern unsigned long lockdep_count_backward_deps(struct lock_class *);
Ingo Molnard6672c52008-08-01 11:23:50 +0200[diff] [blame]56#else
57static inline unsigned long
58lockdep_count_forward_deps(struct lock_class *class)
59{
60 return 0;
61}
62static inline unsigned long
63lockdep_count_backward_deps(struct lock_class *class)
64{
65 return 0;
66}
67#endif
David Miller419ca3f2008-07-29 21:45:03 -0700[diff] [blame]68
Ingo Molnarfbb9ce952006-07-03 00:24:50 -0700[diff] [blame]69#ifdef CONFIG_DEBUG_LOCKDEP
70/*
71 * Various lockdep statistics:
72 */
73extern atomic_t chain_lookup_hits;
74extern atomic_t chain_lookup_misses;
75extern atomic_t hardirqs_on_events;
76extern atomic_t hardirqs_off_events;
77extern atomic_t redundant_hardirqs_on;
78extern atomic_t redundant_hardirqs_off;
79extern atomic_t softirqs_on_events;
80extern atomic_t softirqs_off_events;
81extern atomic_t redundant_softirqs_on;
82extern atomic_t redundant_softirqs_off;
83extern atomic_t nr_unused_locks;
84extern atomic_t nr_cyclic_checks;
85extern atomic_t nr_cyclic_check_recursions;
86extern atomic_t nr_find_usage_forwards_checks;
87extern atomic_t nr_find_usage_forwards_recursions;
88extern atomic_t nr_find_usage_backwards_checks;
89extern atomic_t nr_find_usage_backwards_recursions;
90# define debug_atomic_inc(ptr) atomic_inc(ptr)
91# define debug_atomic_dec(ptr) atomic_dec(ptr)
92# define debug_atomic_read(ptr) atomic_read(ptr)
93#else
94# define debug_atomic_inc(ptr) do { } while (0)
95# define debug_atomic_dec(ptr) do { } while (0)
96# define debug_atomic_read(ptr) 0
97#endif