include/linux/debug_locks.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __LINUX_DEBUG_LOCKING_H
   3 #define __LINUX_DEBUG_LOCKING_H
   4
   5 #include <linux/atomic.h>
   6 #include <linux/cache.h>
   7
   8 struct task_struct;
   9
  10 extern int debug_locks __read_mostly;
  11 extern int debug_locks_silent __read_mostly;
  12
  13
  14 static __always_inline int __debug_locks_off(void)
  15 {
  16         return xchg(&debug_locks, 0);
  17 }
  18
  19 /*
  20  * Generic 'turn off all lock debugging' function:
  21  */
  22 extern int debug_locks_off(void);
  23
  24 #define DEBUG_LOCKS_WARN_ON(c)                                          \
  25 ({                                                                      \
  26         int __ret = 0;                                                  \
  27                                                                         \
  28         if (!oops_in_progress && unlikely(c)) {                         \
  29                 instrumentation_begin();                                \
  30                 if (debug_locks_off() && !debug_locks_silent)           \
  31                         WARN(1, "DEBUG_LOCKS_WARN_ON(%s)", #c);         \
  32                 instrumentation_end();                                  \
  33                 __ret = 1;                                              \
  34         }                                                               \
  35         __ret;                                                          \
  36 })
  37
  38 #ifdef CONFIG_SMP
  39 # define SMP_DEBUG_LOCKS_WARN_ON(c)                     DEBUG_LOCKS_WARN_ON(c)
  40 #else
  41 # define SMP_DEBUG_LOCKS_WARN_ON(c)                     do { } while (0)
  42 #endif
  43
  44 #ifdef CONFIG_DEBUG_LOCKING_API_SELFTESTS
  45   extern void locking_selftest(void);
  46 #else
  47 # define locking_selftest()     do { } while (0)
  48 #endif
  49
  50 #ifdef CONFIG_LOCKDEP
  51 extern void debug_show_all_locks(void);
  52 extern void debug_show_held_locks(struct task_struct *task);
  53 extern void debug_check_no_locks_freed(const void *from, unsigned long len);
  54 extern void debug_check_no_locks_held(void);
  55 #else
  56 static inline void debug_show_all_locks(void)
  57 {
  58 }
  59
  60 static inline void debug_show_held_locks(struct task_struct *task)
  61 {
  62 }
  63
  64 static inline void
  65 debug_check_no_locks_freed(const void *from, unsigned long len)
  66 {
  67 }
  68
  69 static inline void
  70 debug_check_no_locks_held(void)
  71 {
  72 }
  73 #endif
  74
  75 #endif