lockdep_internals.h

  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
 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
 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
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Linux/kernel/lockdep_internals.h
