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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/atomic.h>
  6 #include <linux/bug.h>
  7 #include <linux/printk.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 __always_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                 instrumentation_begin();                                \
 31                 if (debug_locks_off() && !debug_locks_silent)           \
 32                         WARN(1, "DEBUG_LOCKS_WARN_ON(%s)", #c);         \
 33                 instrumentation_end();                                  \
 34                 __ret = 1;                                              \
 35         }                                                               \
 36         __ret;                                                          \
 37 })
 38 
 39 #ifdef CONFIG_SMP
 40 # define SMP_DEBUG_LOCKS_WARN_ON(c)                     DEBUG_LOCKS_WARN_ON(c)
 41 #else
 42 # define SMP_DEBUG_LOCKS_WARN_ON(c)                     do { } while (0)
 43 #endif
 44 
 45 #ifdef CONFIG_DEBUG_LOCKING_API_SELFTESTS
 46   extern void locking_selftest(void);
 47 #else
 48 # define locking_selftest()     do { } while (0)
 49 #endif
 50 
 51 struct task_struct;
 52 
 53 #ifdef CONFIG_LOCKDEP
 54 extern void debug_show_all_locks(void);
 55 extern void debug_show_held_locks(struct task_struct *task);
 56 extern void debug_check_no_locks_freed(const void *from, unsigned long len);
 57 extern void debug_check_no_locks_held(void);
 58 #else
 59 static inline void debug_show_all_locks(void)
 60 {
 61 }
 62 
 63 static inline void debug_show_held_locks(struct task_struct *task)
 64 {
 65 }
 66 
 67 static inline void
 68 debug_check_no_locks_freed(const void *from, unsigned long len)
 69 {
 70 }
 71 
 72 static inline void
 73 debug_check_no_locks_held(void)
 74 {
 75 }
 76 #endif
 77 
 78 #endif
 79 

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