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11#ifndef __LINUX_MUTEX_H
12#define __LINUX_MUTEX_H
13
14#include <asm/current.h>
15#include <linux/list.h>
16#include <linux/spinlock_types.h>
17#include <linux/lockdep.h>
18#include <linux/atomic.h>
19#include <asm/processor.h>
20#include <linux/osq_lock.h>
21#include <linux/debug_locks.h>
22
23struct ww_acquire_ctx;
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53struct mutex {
54 atomic_long_t owner;
55 spinlock_t wait_lock;
56#ifdef CONFIG_MUTEX_SPIN_ON_OWNER
57 struct optimistic_spin_queue osq;
58#endif
59 struct list_head wait_list;
60#ifdef CONFIG_DEBUG_MUTEXES
61 void *magic;
62#endif
63#ifdef CONFIG_DEBUG_LOCK_ALLOC
64 struct lockdep_map dep_map;
65#endif
66};
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72struct mutex_waiter {
73 struct list_head list;
74 struct task_struct *task;
75 struct ww_acquire_ctx *ww_ctx;
76#ifdef CONFIG_DEBUG_MUTEXES
77 void *magic;
78#endif
79};
80
81#ifdef CONFIG_DEBUG_MUTEXES
82
83#define __DEBUG_MUTEX_INITIALIZER(lockname) \
84 , .magic = &lockname
85
86extern void mutex_destroy(struct mutex *lock);
87
88#else
89
90# define __DEBUG_MUTEX_INITIALIZER(lockname)
91
92static inline void mutex_destroy(struct mutex *lock) {}
93
94#endif
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104#define mutex_init(mutex) \
105do { \
106 static struct lock_class_key __key; \
107 \
108 __mutex_init((mutex), #mutex, &__key); \
109} while (0)
110
111#ifdef CONFIG_DEBUG_LOCK_ALLOC
112# define __DEP_MAP_MUTEX_INITIALIZER(lockname) \
113 , .dep_map = { .name = #lockname }
114#else
115# define __DEP_MAP_MUTEX_INITIALIZER(lockname)
116#endif
117
118#define __MUTEX_INITIALIZER(lockname) \
119 { .owner = ATOMIC_LONG_INIT(0) \
120 , .wait_lock = __SPIN_LOCK_UNLOCKED(lockname.wait_lock) \
121 , .wait_list = LIST_HEAD_INIT(lockname.wait_list) \
122 __DEBUG_MUTEX_INITIALIZER(lockname) \
123 __DEP_MAP_MUTEX_INITIALIZER(lockname) }
124
125#define DEFINE_MUTEX(mutexname) \
126 struct mutex mutexname = __MUTEX_INITIALIZER(mutexname)
127
128extern void __mutex_init(struct mutex *lock, const char *name,
129 struct lock_class_key *key);
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137extern bool mutex_is_locked(struct mutex *lock);
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143#ifdef CONFIG_DEBUG_LOCK_ALLOC
144extern void mutex_lock_nested(struct mutex *lock, unsigned int subclass);
145extern void _mutex_lock_nest_lock(struct mutex *lock, struct lockdep_map *nest_lock);
146
147extern int __must_check mutex_lock_interruptible_nested(struct mutex *lock,
148 unsigned int subclass);
149extern int __must_check mutex_lock_killable_nested(struct mutex *lock,
150 unsigned int subclass);
151extern void mutex_lock_io_nested(struct mutex *lock, unsigned int subclass);
152
153#define mutex_lock(lock) mutex_lock_nested(lock, 0)
154#define mutex_lock_interruptible(lock) mutex_lock_interruptible_nested(lock, 0)
155#define mutex_lock_killable(lock) mutex_lock_killable_nested(lock, 0)
156#define mutex_lock_io(lock) mutex_lock_io_nested(lock, 0)
157
158#define mutex_lock_nest_lock(lock, nest_lock) \
159do { \
160 typecheck(struct lockdep_map *, &(nest_lock)->dep_map); \
161 _mutex_lock_nest_lock(lock, &(nest_lock)->dep_map); \
162} while (0)
163
164#else
165extern void mutex_lock(struct mutex *lock);
166extern int __must_check mutex_lock_interruptible(struct mutex *lock);
167extern int __must_check mutex_lock_killable(struct mutex *lock);
168extern void mutex_lock_io(struct mutex *lock);
169
170# define mutex_lock_nested(lock, subclass) mutex_lock(lock)
171# define mutex_lock_interruptible_nested(lock, subclass) mutex_lock_interruptible(lock)
172# define mutex_lock_killable_nested(lock, subclass) mutex_lock_killable(lock)
173# define mutex_lock_nest_lock(lock, nest_lock) mutex_lock(lock)
174# define mutex_lock_io_nested(lock, subclass) mutex_lock(lock)
175#endif
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183extern int mutex_trylock(struct mutex *lock);
184extern void mutex_unlock(struct mutex *lock);
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186extern int atomic_dec_and_mutex_lock(atomic_t *cnt, struct mutex *lock);
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192enum mutex_trylock_recursive_enum {
193 MUTEX_TRYLOCK_FAILED = 0,
194 MUTEX_TRYLOCK_SUCCESS = 1,
195 MUTEX_TRYLOCK_RECURSIVE,
196};
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210extern __must_check enum mutex_trylock_recursive_enum
211mutex_trylock_recursive(struct mutex *lock);
212
213#endif
214