1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Mutexes: blocking mutual exclusion locks 4 * 5 * started by Ingo Molnar: 6 * 7 * Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> 8 */ 9 10 /* 11 * This is the control structure for tasks blocked on mutex, which resides 12 * on the blocked task's kernel stack: 13 */ 14 struct mutex_waiter { 15 struct list_head list; 16 struct task_struct *task; 17 struct ww_acquire_ctx *ww_ctx; 18 #ifdef CONFIG_DEBUG_MUTEXES 19 void *magic; 20 #endif 21 }; 22 23 #ifdef CONFIG_DEBUG_MUTEXES 24 extern void debug_mutex_lock_common(struct mutex *lock, 25 struct mutex_waiter *waiter); 26 extern void debug_mutex_wake_waiter(struct mutex *lock, 27 struct mutex_waiter *waiter); 28 extern void debug_mutex_free_waiter(struct mutex_waiter *waiter); 29 extern void debug_mutex_add_waiter(struct mutex *lock, 30 struct mutex_waiter *waiter, 31 struct task_struct *task); 32 extern void debug_mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter, 33 struct task_struct *task); 34 extern void debug_mutex_unlock(struct mutex *lock); 35 extern void debug_mutex_init(struct mutex *lock, const char *name, 36 struct lock_class_key *key); 37 #else /* CONFIG_DEBUG_MUTEXES */ 38 # define debug_mutex_lock_common(lock, waiter) do { } while (0) 39 # define debug_mutex_wake_waiter(lock, waiter) do { } while (0) 40 # define debug_mutex_free_waiter(waiter) do { } while (0) 41 # define debug_mutex_add_waiter(lock, waiter, ti) do { } while (0) 42 # define debug_mutex_remove_waiter(lock, waiter, ti) do { } while (0) 43 # define debug_mutex_unlock(lock) do { } while (0) 44 # define debug_mutex_init(lock, name, key) do { } while (0) 45 #endif /* !CONFIG_DEBUG_MUTEXES */ 46