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
, char *c4
);
37 extern const char * __get_key_name(struct lockdep_subclass_key
*key
, char *str
);
39 struct lock_class
*lock_chain_get_class(struct lock_chain
*chain
, int i
);
41 extern unsigned long nr_lock_classes
;
42 extern unsigned long nr_list_entries
;
43 extern unsigned long nr_lock_chains
;
44 extern int nr_chain_hlocks
;
45 extern unsigned long nr_stack_trace_entries
;
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
;
53 #ifdef CONFIG_PROVE_LOCKING
54 extern unsigned long lockdep_count_forward_deps(struct lock_class
*);
55 extern unsigned long lockdep_count_backward_deps(struct lock_class
*);
57 static inline unsigned long
58 lockdep_count_forward_deps(struct lock_class
*class)
62 static inline unsigned long
63 lockdep_count_backward_deps(struct lock_class
*class)
69 #ifdef CONFIG_DEBUG_LOCKDEP
71 * Various lockdep statistics:
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)
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