Commit | Line | Data |
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fbb9ce95 IM |
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 | ||
50cc670a | 20 | #define MAX_LOCKDEP_CHAINS_BITS 14 |
fbb9ce95 IM |
21 | #define MAX_LOCKDEP_CHAINS (1UL << MAX_LOCKDEP_CHAINS_BITS) |
22 | ||
443cd507 HY |
23 | #define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5) |
24 | ||
fbb9ce95 IM |
25 | /* |
26 | * Stack-trace: tightly packed array of stack backtrace | |
27 | * addresses. Protected by the hash_lock. | |
28 | */ | |
9bb25bf3 | 29 | #define MAX_STACK_TRACE_ENTRIES 262144UL |
fbb9ce95 IM |
30 | |
31 | extern struct list_head all_lock_classes; | |
443cd507 | 32 | extern struct lock_chain lock_chains[]; |
fbb9ce95 IM |
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 | ||
443cd507 HY |
39 | struct lock_class *lock_chain_get_class(struct lock_chain *chain, int i); |
40 | ||
fbb9ce95 IM |
41 | extern unsigned long nr_lock_classes; |
42 | extern unsigned long nr_list_entries; | |
43 | extern unsigned long nr_lock_chains; | |
cd1a28e8 | 44 | extern int nr_chain_hlocks; |
fbb9ce95 IM |
45 | extern unsigned long nr_stack_trace_entries; |
46 | ||
47 | extern unsigned int nr_hardirq_chains; | |
48 | extern unsigned int nr_softirq_chains; | |
49 | extern unsigned int nr_process_chains; | |
50 | extern unsigned int max_lockdep_depth; | |
51 | extern unsigned int max_recursion_depth; | |
52 | ||
d6672c50 | 53 | #ifdef CONFIG_PROVE_LOCKING |
419ca3f1 DM |
54 | extern unsigned long lockdep_count_forward_deps(struct lock_class *); |
55 | extern unsigned long lockdep_count_backward_deps(struct lock_class *); | |
d6672c50 IM |
56 | #else |
57 | static inline unsigned long | |
58 | lockdep_count_forward_deps(struct lock_class *class) | |
59 | { | |
60 | return 0; | |
61 | } | |
62 | static inline unsigned long | |
63 | lockdep_count_backward_deps(struct lock_class *class) | |
64 | { | |
65 | return 0; | |
66 | } | |
67 | #endif | |
419ca3f1 | 68 | |
fbb9ce95 IM |
69 | #ifdef CONFIG_DEBUG_LOCKDEP |
70 | /* | |
71 | * Various lockdep statistics: | |
72 | */ | |
73 | extern atomic_t chain_lookup_hits; | |
74 | extern atomic_t chain_lookup_misses; | |
75 | extern atomic_t hardirqs_on_events; | |
76 | extern atomic_t hardirqs_off_events; | |
77 | extern atomic_t redundant_hardirqs_on; | |
78 | extern atomic_t redundant_hardirqs_off; | |
79 | extern atomic_t softirqs_on_events; | |
80 | extern atomic_t softirqs_off_events; | |
81 | extern atomic_t redundant_softirqs_on; | |
82 | extern atomic_t redundant_softirqs_off; | |
83 | extern atomic_t nr_unused_locks; | |
84 | extern atomic_t nr_cyclic_checks; | |
85 | extern atomic_t nr_cyclic_check_recursions; | |
86 | extern atomic_t nr_find_usage_forwards_checks; | |
87 | extern atomic_t nr_find_usage_forwards_recursions; | |
88 | extern atomic_t nr_find_usage_backwards_checks; | |
89 | extern 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 |