2 * kernel/lockdep_internals.h
4 * Runtime locking correctness validator
6 * lockdep subsystem internal functions and variables.
10 * Lock-class usage-state bits:
16 LOCK_USED_IN_RECLAIM_FS,
19 LOCK_ENABLED_RECLAIM_FS,
20 LOCK_USED_IN_HARDIRQ_READ,
21 LOCK_USED_IN_SOFTIRQ_READ,
22 LOCK_USED_IN_RECLAIM_FS_READ,
23 LOCK_ENABLED_SOFTIRQ_READ,
24 LOCK_ENABLED_HARDIRQ_READ,
25 LOCK_ENABLED_RECLAIM_FS_READ,
30 * Usage-state bitmasks:
32 #define LOCKF_USED (1 << LOCK_USED)
33 #define LOCKF_USED_IN_HARDIRQ (1 << LOCK_USED_IN_HARDIRQ)
34 #define LOCKF_USED_IN_SOFTIRQ (1 << LOCK_USED_IN_SOFTIRQ)
35 #define LOCKF_USED_IN_RECLAIM_FS (1 << LOCK_USED_IN_RECLAIM_FS)
36 #define LOCKF_ENABLED_HARDIRQ (1 << LOCK_ENABLED_HARDIRQ)
37 #define LOCKF_ENABLED_SOFTIRQ (1 << LOCK_ENABLED_SOFTIRQ)
38 #define LOCKF_ENABLED_RECLAIM_FS (1 << LOCK_ENABLED_RECLAIM_FS)
40 #define LOCKF_ENABLED_IRQ (LOCKF_ENABLED_HARDIRQ | LOCKF_ENABLED_SOFTIRQ)
41 #define LOCKF_USED_IN_IRQ (LOCKF_USED_IN_HARDIRQ | LOCKF_USED_IN_SOFTIRQ)
43 #define LOCKF_USED_IN_HARDIRQ_READ (1 << LOCK_USED_IN_HARDIRQ_READ)
44 #define LOCKF_USED_IN_SOFTIRQ_READ (1 << LOCK_USED_IN_SOFTIRQ_READ)
45 #define LOCKF_USED_IN_RECLAIM_FS_READ (1 << LOCK_USED_IN_RECLAIM_FS_READ)
46 #define LOCKF_ENABLED_HARDIRQ_READ (1 << LOCK_ENABLED_HARDIRQ_READ)
47 #define LOCKF_ENABLED_SOFTIRQ_READ (1 << LOCK_ENABLED_SOFTIRQ_READ)
48 #define LOCKF_ENABLED_RECLAIM_FS_READ (1 << LOCK_ENABLED_RECLAIM_FS_READ)
50 #define LOCKF_ENABLED_IRQ_READ \
51 (LOCKF_ENABLED_HARDIRQ_READ | LOCKF_ENABLED_SOFTIRQ_READ)
52 #define LOCKF_USED_IN_IRQ_READ \
53 (LOCKF_USED_IN_HARDIRQ_READ | LOCKF_USED_IN_SOFTIRQ_READ)
56 * MAX_LOCKDEP_ENTRIES is the maximum number of lock dependencies
59 * We use the per-lock dependency maps in two ways: we grow it by adding
60 * every to-be-taken lock to all currently held lock's own dependency
61 * table (if it's not there yet), and we check it for lock order
62 * conflicts and deadlocks.
64 #define MAX_LOCKDEP_ENTRIES 8192UL
66 #define MAX_LOCKDEP_CHAINS_BITS 14
67 #define MAX_LOCKDEP_CHAINS (1UL << MAX_LOCKDEP_CHAINS_BITS)
69 #define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5)
72 * Stack-trace: tightly packed array of stack backtrace
73 * addresses. Protected by the hash_lock.
75 #define MAX_STACK_TRACE_ENTRIES 262144UL
77 extern struct list_head all_lock_classes;
78 extern struct lock_chain lock_chains[];
81 get_usage_chars(struct lock_class *class, char *c1, char *c2, char *c3,
82 char *c4, char *c5, char *c6);
84 extern const char * __get_key_name(struct lockdep_subclass_key *key, char *str);
86 struct lock_class *lock_chain_get_class(struct lock_chain *chain, int i);
88 extern unsigned long nr_lock_classes;
89 extern unsigned long nr_list_entries;
90 extern unsigned long nr_lock_chains;
91 extern int nr_chain_hlocks;
92 extern unsigned long nr_stack_trace_entries;
94 extern unsigned int nr_hardirq_chains;
95 extern unsigned int nr_softirq_chains;
96 extern unsigned int nr_process_chains;
97 extern unsigned int max_lockdep_depth;
98 extern unsigned int max_recursion_depth;
100 #ifdef CONFIG_PROVE_LOCKING
101 extern unsigned long lockdep_count_forward_deps(struct lock_class *);
102 extern unsigned long lockdep_count_backward_deps(struct lock_class *);
104 static inline unsigned long
105 lockdep_count_forward_deps(struct lock_class *class)
109 static inline unsigned long
110 lockdep_count_backward_deps(struct lock_class *class)
116 #ifdef CONFIG_DEBUG_LOCKDEP
118 * Various lockdep statistics:
120 extern atomic_t chain_lookup_hits;
121 extern atomic_t chain_lookup_misses;
122 extern atomic_t hardirqs_on_events;
123 extern atomic_t hardirqs_off_events;
124 extern atomic_t redundant_hardirqs_on;
125 extern atomic_t redundant_hardirqs_off;
126 extern atomic_t softirqs_on_events;
127 extern atomic_t softirqs_off_events;
128 extern atomic_t redundant_softirqs_on;
129 extern atomic_t redundant_softirqs_off;
130 extern atomic_t nr_unused_locks;
131 extern atomic_t nr_cyclic_checks;
132 extern atomic_t nr_cyclic_check_recursions;
133 extern atomic_t nr_find_usage_forwards_checks;
134 extern atomic_t nr_find_usage_forwards_recursions;
135 extern atomic_t nr_find_usage_backwards_checks;
136 extern atomic_t nr_find_usage_backwards_recursions;
137 # define debug_atomic_inc(ptr) atomic_inc(ptr)
138 # define debug_atomic_dec(ptr) atomic_dec(ptr)
139 # define debug_atomic_read(ptr) atomic_read(ptr)
141 # define debug_atomic_inc(ptr) do { } while (0)
142 # define debug_atomic_dec(ptr) do { } while (0)
143 # define debug_atomic_read(ptr) 0