1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __LINUX_DEBUG_LOCKING_H
3#define __LINUX_DEBUG_LOCKING_H
4
5#include <linux/kernel.h>
6#include <linux/atomic.h>
7#include <linux/bug.h>
8
9struct task_struct;
10
11extern int debug_locks __read_mostly;
12extern int debug_locks_silent __read_mostly;
13
14
15static inline int __debug_locks_off(void)
16{
17 return xchg(&debug_locks, 0);
18}
19
20/*
21 * Generic 'turn off all lock debugging' function:
22 */
23extern int debug_locks_off(void);
24
25#define DEBUG_LOCKS_WARN_ON(c) \
26({ \
27 int __ret = 0; \
28 \
29 if (!oops_in_progress && unlikely(c)) { \
30 if (debug_locks_off() && !debug_locks_silent) \
31 WARN(1, "DEBUG_LOCKS_WARN_ON(%s)", #c); \
32 __ret = 1; \
33 } \
34 __ret; \
35})
36
37#ifdef CONFIG_SMP
38# define SMP_DEBUG_LOCKS_WARN_ON(c) DEBUG_LOCKS_WARN_ON(c)
39#else
40# define SMP_DEBUG_LOCKS_WARN_ON(c) do { } while (0)
41#endif
42
43#ifdef CONFIG_DEBUG_LOCKING_API_SELFTESTS
44 extern void locking_selftest(void);
45#else
46# define locking_selftest() do { } while (0)
47#endif
48
49struct task_struct;
50
51#ifdef CONFIG_LOCKDEP
52extern void debug_show_all_locks(void);
53extern void debug_show_held_locks(struct task_struct *task);
54extern void debug_check_no_locks_freed(const void *from, unsigned long len);
55extern void debug_check_no_locks_held(void);
56#else
57static inline void debug_show_all_locks(void)
58{
59}
60
61static inline void debug_show_held_locks(struct task_struct *task)
62{
63}
64
65static inline void
66debug_check_no_locks_freed(const void *from, unsigned long len)
67{
68}
69
70static inline void
71debug_check_no_locks_held(void)
72{
73}
74#endif
75
76#endif
77