LXR linux/include/linux/debug

   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
   8struct task_struct;
   9
  10extern int debug_locks __read_mostly;
  11extern int debug_locks_silent __read_mostly;
  12
  13
  14static __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 */
  22extern 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
  50struct task_struct;
  51
  52#ifdef CONFIG_LOCKDEP
  53extern void debug_show_all_locks(void);
  54extern void debug_show_held_locks(struct task_struct *task);
  55extern void debug_check_no_locks_freed(const void *from, unsigned long len);
  56extern void debug_check_no_locks_held(void);
  57#else
  58static inline void debug_show_all_locks(void)
  59{
  60}
  61
  62static inline void debug_show_held_locks(struct task_struct *task)
  63{
  64}
  65
  66static inline void
  67debug_check_no_locks_freed(const void *from, unsigned long len)
  68{
  69}
  70
  71static inline void
  72debug_check_no_locks_held(void)
  73{
  74}
  75#endif
  76
  77#endif
  78