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kernel/lockdep_internals.h 2.87 KB
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fbb9ce953   Ingo Molnar   [PATCH] lockdep: ... 
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  /*
   * kernel/lockdep_internals.h
   *
   * Runtime locking correctness validator
   *
   * lockdep subsystem internal functions and variables.
   */
  
  /*
   * MAX_LOCKDEP_ENTRIES is the maximum number of lock dependencies
   * we track.
   *
   * We use the per-lock dependency maps in two ways: we grow it by adding
   * every to-be-taken lock to all currently held lock's own dependency
   * table (if it's not there yet), and we check it for lock order
   * conflicts and deadlocks.
   */
  #define MAX_LOCKDEP_ENTRIES	8192UL
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  #define MAX_LOCKDEP_CHAINS_BITS	14
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  #define MAX_LOCKDEP_CHAINS	(1UL << MAX_LOCKDEP_CHAINS_BITS)
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  #define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5)
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  /*
   * Stack-trace: tightly packed array of stack backtrace
   * addresses. Protected by the hash_lock.
   */
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  #define MAX_STACK_TRACE_ENTRIES	262144UL
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  extern struct list_head all_lock_classes;
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  extern struct lock_chain lock_chains[];
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  extern void
  get_usage_chars(struct lock_class *class, char *c1, char *c2, char *c3, char *c4);
  
  extern const char * __get_key_name(struct lockdep_subclass_key *key, char *str);
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  struct lock_class *lock_chain_get_class(struct lock_chain *chain, int i);
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  extern unsigned long nr_lock_classes;
  extern unsigned long nr_list_entries;
  extern unsigned long nr_lock_chains;
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  extern int nr_chain_hlocks;
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  extern unsigned long nr_stack_trace_entries;
  
  extern unsigned int nr_hardirq_chains;
  extern unsigned int nr_softirq_chains;
  extern unsigned int nr_process_chains;
  extern unsigned int max_lockdep_depth;
  extern unsigned int max_recursion_depth;
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  #ifdef CONFIG_PROVE_LOCKING
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  extern unsigned long lockdep_count_forward_deps(struct lock_class *);
  extern unsigned long lockdep_count_backward_deps(struct lock_class *);
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  #else
  static inline unsigned long
  lockdep_count_forward_deps(struct lock_class *class)
  {
  	return 0;
  }
  static inline unsigned long
  lockdep_count_backward_deps(struct lock_class *class)
  {
  	return 0;
  }
  #endif
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fbb9ce953
 
 Ingo Molnar
 
[PATCH] lockdep: ...




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  #ifdef CONFIG_DEBUG_LOCKDEP
  /*
   * Various lockdep statistics:
   */
  extern atomic_t chain_lookup_hits;
  extern atomic_t chain_lookup_misses;
  extern atomic_t hardirqs_on_events;
  extern atomic_t hardirqs_off_events;
  extern atomic_t redundant_hardirqs_on;
  extern atomic_t redundant_hardirqs_off;
  extern atomic_t softirqs_on_events;
  extern atomic_t softirqs_off_events;
  extern atomic_t redundant_softirqs_on;
  extern atomic_t redundant_softirqs_off;
  extern atomic_t nr_unused_locks;
  extern atomic_t nr_cyclic_checks;
  extern atomic_t nr_cyclic_check_recursions;
  extern atomic_t nr_find_usage_forwards_checks;
  extern atomic_t nr_find_usage_forwards_recursions;
  extern atomic_t nr_find_usage_backwards_checks;
  extern atomic_t nr_find_usage_backwards_recursions;
  # define debug_atomic_inc(ptr)		atomic_inc(ptr)
  # define debug_atomic_dec(ptr)		atomic_dec(ptr)
  # define debug_atomic_read(ptr)		atomic_read(ptr)
  #else
  # define debug_atomic_inc(ptr)		do { } while (0)
  # define debug_atomic_dec(ptr)		do { } while (0)
  # define debug_atomic_read(ptr)		0
  #endif