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_KEYS_BITS   11
  21 #define MAX_LOCKDEP_KEYS        (1UL << MAX_LOCKDEP_KEYS_BITS)
  22
  23 #define MAX_LOCKDEP_CHAINS_BITS 14
  24 #define MAX_LOCKDEP_CHAINS      (1UL << MAX_LOCKDEP_CHAINS_BITS)
  25
  26 /*
  27  * Stack-trace: tightly packed array of stack backtrace
  28  * addresses. Protected by the hash_lock.
  29  */
  30 #define MAX_STACK_TRACE_ENTRIES 262144UL
  31
  32 extern struct list_head all_lock_classes;
  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 extern unsigned long nr_lock_classes;
  40 extern unsigned long nr_list_entries;
  41 extern unsigned long nr_lock_chains;
  42 extern unsigned long nr_stack_trace_entries;
  43
  44 extern unsigned int nr_hardirq_chains;
  45 extern unsigned int nr_softirq_chains;
  46 extern unsigned int nr_process_chains;
  47 extern unsigned int max_lockdep_depth;
  48 extern unsigned int max_recursion_depth;
  49
  50 #ifdef CONFIG_DEBUG_LOCKDEP
  51 /*
  52  * Various lockdep statistics:
  53  */
  54 extern atomic_t chain_lookup_hits;
  55 extern atomic_t chain_lookup_misses;
  56 extern atomic_t hardirqs_on_events;
  57 extern atomic_t hardirqs_off_events;
  58 extern atomic_t redundant_hardirqs_on;
  59 extern atomic_t redundant_hardirqs_off;
  60 extern atomic_t softirqs_on_events;
  61 extern atomic_t softirqs_off_events;
  62 extern atomic_t redundant_softirqs_on;
  63 extern atomic_t redundant_softirqs_off;
  64 extern atomic_t nr_unused_locks;
  65 extern atomic_t nr_cyclic_checks;
  66 extern atomic_t nr_cyclic_check_recursions;
  67 extern atomic_t nr_find_usage_forwards_checks;
  68 extern atomic_t nr_find_usage_forwards_recursions;
  69 extern atomic_t nr_find_usage_backwards_checks;
  70 extern atomic_t nr_find_usage_backwards_recursions;
  71 # define debug_atomic_inc(ptr)          atomic_inc(ptr)
  72 # define debug_atomic_dec(ptr)          atomic_dec(ptr)
  73 # define debug_atomic_read(ptr)         atomic_read(ptr)
  74 #else
  75 # define debug_atomic_inc(ptr)          do { } while (0)
  76 # define debug_atomic_dec(ptr)          do { } while (0)
  77 # define debug_atomic_read(ptr)         0
  78 #endif