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
76
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