include/linux/debug_locks.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef __LINUX_DEBUG_LOCKING_H
0003 #define __LINUX_DEBUG_LOCKING_H
0004
0005 #include <linux/atomic.h>
0006 #include <linux/cache.h>
0007
0008 struct task_struct;
0009
0010 extern int debug_locks __read_mostly;
0011 extern int debug_locks_silent __read_mostly;
0012
0013
0014 static __always_inline int __debug_locks_off(void)
0015 {
0016     return xchg(&debug_locks, 0);
0017 }
0018
0019 /*
0020  * Generic 'turn off all lock debugging' function:
0021  */
0022 extern int debug_locks_off(void);
0023
0024 #define DEBUG_LOCKS_WARN_ON(c)                      \
0025 ({                                  \
0026     int __ret = 0;                          \
0027                                     \
0028     if (!oops_in_progress && unlikely(c)) {             \
0029         instrumentation_begin();                \
0030         if (debug_locks_off() && !debug_locks_silent)       \
0031             WARN(1, "DEBUG_LOCKS_WARN_ON(%s)", #c);     \
0032         instrumentation_end();                  \
0033         __ret = 1;                      \
0034     }                               \
0035     __ret;                              \
0036 })
0037
0038 #ifdef CONFIG_SMP
0039 # define SMP_DEBUG_LOCKS_WARN_ON(c)         DEBUG_LOCKS_WARN_ON(c)
0040 #else
0041 # define SMP_DEBUG_LOCKS_WARN_ON(c)         do { } while (0)
0042 #endif
0043
0044 #ifdef CONFIG_DEBUG_LOCKING_API_SELFTESTS
0045   extern void locking_selftest(void);
0046 #else
0047 # define locking_selftest() do { } while (0)
0048 #endif
0049
0050 #ifdef CONFIG_LOCKDEP
0051 extern void debug_show_all_locks(void);
0052 extern void debug_show_held_locks(struct task_struct *task);
0053 extern void debug_check_no_locks_freed(const void *from, unsigned long len);
0054 extern void debug_check_no_locks_held(void);
0055 #else
0056 static inline void debug_show_all_locks(void)
0057 {
0058 }
0059
0060 static inline void debug_show_held_locks(struct task_struct *task)
0061 {
0062 }
0063
0064 static inline void
0065 debug_check_no_locks_freed(const void *from, unsigned long len)
0066 {
0067 }
0068
0069 static inline void
0070 debug_check_no_locks_held(void)
0071 {
0072 }
0073 #endif
0074
0075 #endif