LXR linux/kernel/lockdep

   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
  32extern struct list_head all_lock_classes;
  33
  34extern void
  35get_usage_chars(struct lock_class *class, char *c1, char *c2, char *c3, char *c4);
  36
  37extern const char * __get_key_name(struct lockdep_subclass_key *key, char *str);
  38
  39extern unsigned long nr_lock_classes;
  40extern unsigned long nr_list_entries;
  41extern unsigned long nr_lock_chains;
  42extern unsigned long nr_stack_trace_entries;
  43
  44extern unsigned int nr_hardirq_chains;
  45extern unsigned int nr_softirq_chains;
  46extern unsigned int nr_process_chains;
  47extern unsigned int max_lockdep_depth;
  48extern unsigned int max_recursion_depth;
  49
  50#ifdef CONFIG_DEBUG_LOCKDEP
  51/*
  52 * Various lockdep statistics:
  53 */
  54extern atomic_t chain_lookup_hits;
  55extern atomic_t chain_lookup_misses;
  56extern atomic_t hardirqs_on_events;
  57extern atomic_t hardirqs_off_events;
  58extern atomic_t redundant_hardirqs_on;
  59extern atomic_t redundant_hardirqs_off;
  60extern atomic_t softirqs_on_events;
  61extern atomic_t softirqs_off_events;
  62extern atomic_t redundant_softirqs_on;
  63extern atomic_t redundant_softirqs_off;
  64extern atomic_t nr_unused_locks;
  65extern atomic_t nr_cyclic_checks;
  66extern atomic_t nr_cyclic_check_recursions;
  67extern atomic_t nr_find_usage_forwards_checks;
  68extern atomic_t nr_find_usage_forwards_recursions;
  69extern atomic_t nr_find_usage_backwards_checks;
  70extern 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
  79