2 * kernel/lockdep_internals.h
4 * Runtime locking correctness validator
6 * lockdep subsystem internal functions and variables.
10 * MAX_LOCKDEP_ENTRIES is the maximum number of lock dependencies
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.
18 #define MAX_LOCKDEP_ENTRIES 8192UL
20 #define MAX_LOCKDEP_CHAINS_BITS 14
21 #define MAX_LOCKDEP_CHAINS (1UL << MAX_LOCKDEP_CHAINS_BITS)
23 #define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5)
26 * Stack-trace: tightly packed array of stack backtrace
27 * addresses. Protected by the hash_lock.
29 #define MAX_STACK_TRACE_ENTRIES 262144UL
31 extern struct list_head all_lock_classes;
32 extern struct lock_chain lock_chains[];
35 get_usage_chars(struct lock_class *class, char *c1, char *c2, char *c3,
36 char *c4, char *c5, char *c6);
38 extern const char * __get_key_name(struct lockdep_subclass_key *key, char *str);
40 struct lock_class *lock_chain_get_class(struct lock_chain *chain, int i);
42 extern unsigned long nr_lock_classes;
43 extern unsigned long nr_list_entries;
44 extern unsigned long nr_lock_chains;
45 extern int nr_chain_hlocks;
46 extern unsigned long nr_stack_trace_entries;
48 extern unsigned int nr_hardirq_chains;
49 extern unsigned int nr_softirq_chains;
50 extern unsigned int nr_process_chains;
51 extern unsigned int max_lockdep_depth;
52 extern unsigned int max_recursion_depth;
54 #ifdef CONFIG_PROVE_LOCKING
55 extern unsigned long lockdep_count_forward_deps(struct lock_class *);
56 extern unsigned long lockdep_count_backward_deps(struct lock_class *);
58 static inline unsigned long
59 lockdep_count_forward_deps(struct lock_class *class)
63 static inline unsigned long
64 lockdep_count_backward_deps(struct lock_class *class)
70 #ifdef CONFIG_DEBUG_LOCKDEP
72 * Various lockdep statistics:
74 extern atomic_t chain_lookup_hits;
75 extern atomic_t chain_lookup_misses;
76 extern atomic_t hardirqs_on_events;
77 extern atomic_t hardirqs_off_events;
78 extern atomic_t redundant_hardirqs_on;
79 extern atomic_t redundant_hardirqs_off;
80 extern atomic_t softirqs_on_events;
81 extern atomic_t softirqs_off_events;
82 extern atomic_t redundant_softirqs_on;
83 extern atomic_t redundant_softirqs_off;
84 extern atomic_t nr_unused_locks;
85 extern atomic_t nr_cyclic_checks;
86 extern atomic_t nr_cyclic_check_recursions;
87 extern atomic_t nr_find_usage_forwards_checks;
88 extern atomic_t nr_find_usage_forwards_recursions;
89 extern atomic_t nr_find_usage_backwards_checks;
90 extern atomic_t nr_find_usage_backwards_recursions;
91 # define debug_atomic_inc(ptr) atomic_inc(ptr)
92 # define debug_atomic_dec(ptr) atomic_dec(ptr)
93 # define debug_atomic_read(ptr) atomic_read(ptr)
95 # define debug_atomic_inc(ptr) do { } while (0)
96 # define debug_atomic_dec(ptr) do { } while (0)
97 # define debug_atomic_read(ptr) 0