locking/lockdep: Fix debug_locks off performance problem
[muen/linux.git] / include / linux / debug_locks.h
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
9 struct task_struct;
10
11 extern int debug_locks;
12 extern int debug_locks_silent;
13
14
15 static 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  */
23 extern 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
49 struct task_struct;
50
51 #ifdef CONFIG_LOCKDEP
52 extern void debug_show_all_locks(void);
53 extern void debug_show_held_locks(struct task_struct *task);
54 extern void debug_check_no_locks_freed(const void *from, unsigned long len);
55 extern void debug_check_no_locks_held(void);
56 #else
57 static inline void debug_show_all_locks(void)
58 {
59 }
60
61 static inline void debug_show_held_locks(struct task_struct *task)
62 {
63 }
64
65 static inline void
66 debug_check_no_locks_freed(const void *from, unsigned long len)
67 {
68 }
69
70 static inline void
71 debug_check_no_locks_held(void)
72 {
73 }
74 #endif
75
76 #endif