/* SPDX-License-Identifier: GPL-2.0 *//* * Mutexes: blocking mutual exclusion locks * * started by Ingo Molnar: * *  Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> */ /* * This is the control structure for tasks blocked on mutex, which resides * on the blocked task's kernel stack: */struct mutex_waiter {	struct list_head	list;	struct task_struct	*task;	struct ww_acquire_ctx	*ww_ctx;#ifdef CONFIG_DEBUG_MUTEXES	void			*magic;#endif}; #ifdef CONFIG_DEBUG_MUTEXESextern void debug_mutex_lock_common(struct mutex *lock,				    struct mutex_waiter *waiter);extern void debug_mutex_wake_waiter(struct mutex *lock,				    struct mutex_waiter *waiter);extern void debug_mutex_free_waiter(struct mutex_waiter *waiter);extern void debug_mutex_add_waiter(struct mutex *lock,				   struct mutex_waiter *waiter,				   struct task_struct *task);extern void debug_mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter,				      struct task_struct *task);extern void debug_mutex_unlock(struct mutex *lock);extern void debug_mutex_init(struct mutex *lock, const char *name,			     struct lock_class_key *key);#else /* CONFIG_DEBUG_MUTEXES */# define debug_mutex_lock_common(lock, waiter)		do { } while (0)# define debug_mutex_wake_waiter(lock, waiter)		do { } while (0)# define debug_mutex_free_waiter(waiter)		do { } while (0)# define debug_mutex_add_waiter(lock, waiter, ti)	do { } while (0)# define debug_mutex_remove_waiter(lock, waiter, ti)	do { } while (0)# define debug_mutex_unlock(lock)			do { } while (0)# define debug_mutex_init(lock, name, key)		do { } while (0)#endif /* !CONFIG_DEBUG_MUTEXES */