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Linux/include/linux/debug_locks.h

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  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 __read_mostly;
 12 extern int debug_locks_silent __read_mostly;
 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
 77 

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