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
50#ifdef CONFIG_LOCKDEP
51extern void debug_show_all_locks(void);
52extern void debug_show_held_locks(struct task_struct *task);
53extern void debug_check_no_locks_freed(const void *from, unsigned long len);
54extern void debug_check_no_locks_held(void);
55#else
56static inline void debug_show_all_locks(void)
57{
58}
59
60static inline void debug_show_held_locks(struct task_struct *task)
61{
62}
63
64static inline void
65debug_check_no_locks_freed(const void *from, unsigned long len)
66{
67}
68
69static inline void
70debug_check_no_locks_held(void)
71{
72}
73#endif
74
75#endif
76