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 20 #define MAX_LOCKDEP_CHAINS_BITS 14 21 #define MAX_LOCKDEP_CHAINS (1UL << MAX_LOCKDEP_CHAINS_BITS) 22 23 #define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5) 24 25 /* 26 * Stack-trace: tightly packed array of stack backtrace 27 * addresses. Protected by the hash_lock. 28 */ 29 #define MAX_STACK_TRACE_ENTRIES 262144UL 30 31 extern struct list_head all_lock_classes; 32 extern struct lock_chain lock_chains[]; 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 39 struct lock_class *lock_chain_get_class(struct lock_chain *chain, int i); 40 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; 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 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 *); 56 #else 57 static inline unsigned long lockdep_count_forward_deps(struct lock_class * class)58lockdep_count_forward_deps(struct lock_class *class) 59 { 60 return 0; 61 } 62 static inline unsigned long lockdep_count_backward_deps(struct lock_class * class)63lockdep_count_backward_deps(struct lock_class *class) 64 { 65 return 0; 66 } 67 #endif 68 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 98