include/linux/debug_locks.h

   1 #ifndef __LINUX_DEBUG_LOCKING_H
   2 #define __LINUX_DEBUG_LOCKING_H
   3
   4 struct task_struct;
   5
   6 extern int debug_locks;
   7 extern int debug_locks_silent;
   8
   9 /*
  10  * Generic 'turn off all lock debugging' function:
  11  */
  12 extern int debug_locks_off(void);
  13
  14 /*
  15  * In the debug case we carry the caller's instruction pointer into
  16  * other functions, but we dont want the function argument overhead
  17  * in the nondebug case - hence these macros:
  18  */
  19 #define _RET_IP_                (unsigned long)__builtin_return_address(0)
  20 #define _THIS_IP_  ({ __label__ __here; __here: (unsigned long)&&__here; })
  21
  22 #define DEBUG_LOCKS_WARN_ON(c)                                          \
  23 ({                                                                      \
  24         int __ret = 0;                                                  \
  25                                                                         \
  26         if (unlikely(c)) {                                              \
  27                 if (debug_locks_off() && !debug_locks_silent)           \
  28                         WARN_ON(1);                                     \
  29                 __ret = 1;                                              \
  30         }                                                               \
  31         __ret;                                                          \
  32 })
  33
  34 #ifdef CONFIG_SMP
  35 # define SMP_DEBUG_LOCKS_WARN_ON(c)                     DEBUG_LOCKS_WARN_ON(c)
  36 #else
  37 # define SMP_DEBUG_LOCKS_WARN_ON(c)                     do { } while (0)
  38 #endif
  39
  40 #ifdef CONFIG_DEBUG_LOCKING_API_SELFTESTS
  41   extern void locking_selftest(void);
  42 #else
  43 # define locking_selftest()     do { } while (0)
  44 #endif
  45
  46 struct task_struct;
  47
  48 #ifdef CONFIG_LOCKDEP
  49 extern void debug_show_all_locks(void);
  50 extern void debug_show_held_locks(struct task_struct *task);
  51 extern void debug_check_no_locks_freed(const void *from, unsigned long len);
  52 extern void debug_check_no_locks_held(struct task_struct *task);
  53 #else
  54 static inline void debug_show_all_locks(void)
  55 {
  56 }
  57
  58 static inline void debug_show_held_locks(struct task_struct *task)
  59 {
  60 }
  61
  62 static inline void
  63 debug_check_no_locks_freed(const void *from, unsigned long len)
  64 {
  65 }
  66
  67 static inline void
  68 debug_check_no_locks_held(struct task_struct *task)
  69 {
  70 }
  71 #endif
  72
  73 #endif