tools/lib/lockdep/include/liblockdep/common.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LIBLOCKDEP_COMMON_H
   3 #define _LIBLOCKDEP_COMMON_H
   4
   5 #include <pthread.h>
   6
   7 #define NR_LOCKDEP_CACHING_CLASSES 2
   8 #define MAX_LOCKDEP_SUBCLASSES 8UL
   9
  10 #ifndef CALLER_ADDR0
  11 #define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
  12 #endif
  13
  14 #ifndef _RET_IP_
  15 #define _RET_IP_ CALLER_ADDR0
  16 #endif
  17
  18 #ifndef _THIS_IP_
  19 #define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; })
  20 #endif
  21
  22 struct lockdep_subclass_key {
  23         char __one_byte;
  24 };
  25
  26 struct lock_class_key {
  27         struct lockdep_subclass_key subkeys[MAX_LOCKDEP_SUBCLASSES];
  28 };
  29
  30 struct lockdep_map {
  31         struct lock_class_key   *key;
  32         struct lock_class       *class_cache[NR_LOCKDEP_CACHING_CLASSES];
  33         const char              *name;
  34 #ifdef CONFIG_LOCK_STAT
  35         int                     cpu;
  36         unsigned long           ip;
  37 #endif
  38 };
  39
  40 void lockdep_init_map(struct lockdep_map *lock, const char *name,
  41                         struct lock_class_key *key, int subclass);
  42 void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
  43                         int trylock, int read, int check,
  44                         struct lockdep_map *nest_lock, unsigned long ip);
  45 void lock_release(struct lockdep_map *lock, unsigned long ip);
  46 void lockdep_reset_lock(struct lockdep_map *lock);
  47 void lockdep_register_key(struct lock_class_key *key);
  48 void lockdep_unregister_key(struct lock_class_key *key);
  49 extern void debug_check_no_locks_freed(const void *from, unsigned long len);
  50
  51 #define STATIC_LOCKDEP_MAP_INIT(_name, _key) \
  52         { .name = (_name), .key = (void *)(_key), }
  53
  54 #endif