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 
__debug_locks_off(void)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
debug_show_all_locks(void)56 static inline void debug_show_all_locks(void)
57 {
58 }
59 
debug_show_held_locks(struct task_struct * task)60 static inline void debug_show_held_locks(struct task_struct *task)
61 {
62 }
63 
64 static inline void
debug_check_no_locks_freed(const void * from,unsigned long len)65 debug_check_no_locks_freed(const void *from, unsigned long len)
66 {
67 }
68 
69 static inline void
debug_check_no_locks_held(void)70 debug_check_no_locks_held(void)
71 {
72 }
73 #endif
74 
75 #endif
76