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

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  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
 55 

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