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