kernel/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