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[mirror_ubuntu-artful-kernel.git] / include / linux / spinlock_api_smp.h
1 #ifndef __LINUX_SPINLOCK_API_SMP_H
2 #define __LINUX_SPINLOCK_API_SMP_H
3
4 #ifndef __LINUX_SPINLOCK_H
5 # error "please don't include this file directly"
6 #endif
7
8 /*
9 * include/linux/spinlock_api_smp.h
10 *
11 * spinlock API declarations on SMP (and debug)
12 * (implemented in kernel/spinlock.c)
13 *
14 * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
15 * Released under the General Public License (GPL).
16 */
17
18 int in_lock_functions(unsigned long addr);
19
20 #define assert_raw_spin_locked(x) BUG_ON(!raw_spin_is_locked(x))
21
22 void __lockfunc _raw_spin_lock(raw_spinlock_t *lock) __acquires(lock);
23 void __lockfunc _raw_spin_lock_nested(raw_spinlock_t *lock, int subclass)
24 __acquires(lock);
25 void __lockfunc _raw_spin_lock_bh_nested(raw_spinlock_t *lock, int subclass)
26 __acquires(lock);
27 void __lockfunc
28 _raw_spin_lock_nest_lock(raw_spinlock_t *lock, struct lockdep_map *map)
29 __acquires(lock);
30 void __lockfunc _raw_spin_lock_bh(raw_spinlock_t *lock) __acquires(lock);
31 void __lockfunc _raw_spin_lock_irq(raw_spinlock_t *lock)
32 __acquires(lock);
33
34 unsigned long __lockfunc _raw_spin_lock_irqsave(raw_spinlock_t *lock)
35 __acquires(lock);
36 unsigned long __lockfunc
37 _raw_spin_lock_irqsave_nested(raw_spinlock_t *lock, int subclass)
38 __acquires(lock);
39 int __lockfunc _raw_spin_trylock(raw_spinlock_t *lock);
40 int __lockfunc _raw_spin_trylock_bh(raw_spinlock_t *lock);
41 void __lockfunc _raw_spin_unlock(raw_spinlock_t *lock) __releases(lock);
42 void __lockfunc _raw_spin_unlock_bh(raw_spinlock_t *lock) __releases(lock);
43 void __lockfunc _raw_spin_unlock_irq(raw_spinlock_t *lock) __releases(lock);
44 void __lockfunc
45 _raw_spin_unlock_irqrestore(raw_spinlock_t *lock, unsigned long flags)
46 __releases(lock);
47
48 #ifdef CONFIG_INLINE_SPIN_LOCK
49 #define _raw_spin_lock(lock) __raw_spin_lock(lock)
50 #endif
51
52 #ifdef CONFIG_INLINE_SPIN_LOCK_BH
53 #define _raw_spin_lock_bh(lock) __raw_spin_lock_bh(lock)
54 #endif
55
56 #ifdef CONFIG_INLINE_SPIN_LOCK_IRQ
57 #define _raw_spin_lock_irq(lock) __raw_spin_lock_irq(lock)
58 #endif
59
60 #ifdef CONFIG_INLINE_SPIN_LOCK_IRQSAVE
61 #define _raw_spin_lock_irqsave(lock) __raw_spin_lock_irqsave(lock)
62 #endif
63
64 #ifdef CONFIG_INLINE_SPIN_TRYLOCK
65 #define _raw_spin_trylock(lock) __raw_spin_trylock(lock)
66 #endif
67
68 #ifdef CONFIG_INLINE_SPIN_TRYLOCK_BH
69 #define _raw_spin_trylock_bh(lock) __raw_spin_trylock_bh(lock)
70 #endif
71
72 #ifndef CONFIG_UNINLINE_SPIN_UNLOCK
73 #define _raw_spin_unlock(lock) __raw_spin_unlock(lock)
74 #endif
75
76 #ifdef CONFIG_INLINE_SPIN_UNLOCK_BH
77 #define _raw_spin_unlock_bh(lock) __raw_spin_unlock_bh(lock)
78 #endif
79
80 #ifdef CONFIG_INLINE_SPIN_UNLOCK_IRQ
81 #define _raw_spin_unlock_irq(lock) __raw_spin_unlock_irq(lock)
82 #endif
83
84 #ifdef CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE
85 #define _raw_spin_unlock_irqrestore(lock, flags) __raw_spin_unlock_irqrestore(lock, flags)
86 #endif
87
88 static inline int __raw_spin_trylock(raw_spinlock_t *lock)
89 {
90 preempt_disable();
91 if (do_raw_spin_trylock(lock)) {
92 spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
93 return 1;
94 }
95 preempt_enable();
96 return 0;
97 }
98
99 /*
100 * If lockdep is enabled then we use the non-preemption spin-ops
101 * even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
102 * not re-enabled during lock-acquire (which the preempt-spin-ops do):
103 */
104 #if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)
105
106 static inline unsigned long __raw_spin_lock_irqsave(raw_spinlock_t *lock)
107 {
108 unsigned long flags;
109
110 local_irq_save(flags);
111 preempt_disable();
112 spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
113 /*
114 * On lockdep we dont want the hand-coded irq-enable of
115 * do_raw_spin_lock_flags() code, because lockdep assumes
116 * that interrupts are not re-enabled during lock-acquire:
117 */
118 #ifdef CONFIG_LOCKDEP
119 LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
120 #else
121 do_raw_spin_lock_flags(lock, &flags);
122 #endif
123 return flags;
124 }
125
126 static inline void __raw_spin_lock_irq(raw_spinlock_t *lock)
127 {
128 local_irq_disable();
129 preempt_disable();
130 spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
131 LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
132 }
133
134 static inline void __raw_spin_lock_bh(raw_spinlock_t *lock)
135 {
136 __local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
137 spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
138 LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
139 }
140
141 static inline void __raw_spin_lock(raw_spinlock_t *lock)
142 {
143 preempt_disable();
144 spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
145 LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
146 }
147
148 #endif /* !CONFIG_GENERIC_LOCKBREAK || CONFIG_DEBUG_LOCK_ALLOC */
149
150 static inline void __raw_spin_unlock(raw_spinlock_t *lock)
151 {
152 spin_release(&lock->dep_map, 1, _RET_IP_);
153 do_raw_spin_unlock(lock);
154 preempt_enable();
155 }
156
157 static inline void __raw_spin_unlock_irqrestore(raw_spinlock_t *lock,
158 unsigned long flags)
159 {
160 spin_release(&lock->dep_map, 1, _RET_IP_);
161 do_raw_spin_unlock(lock);
162 local_irq_restore(flags);
163 preempt_enable();
164 }
165
166 static inline void __raw_spin_unlock_irq(raw_spinlock_t *lock)
167 {
168 spin_release(&lock->dep_map, 1, _RET_IP_);
169 do_raw_spin_unlock(lock);
170 local_irq_enable();
171 preempt_enable();
172 }
173
174 static inline void __raw_spin_unlock_bh(raw_spinlock_t *lock)
175 {
176 spin_release(&lock->dep_map, 1, _RET_IP_);
177 do_raw_spin_unlock(lock);
178 __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
179 }
180
181 static inline int __raw_spin_trylock_bh(raw_spinlock_t *lock)
182 {
183 __local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
184 if (do_raw_spin_trylock(lock)) {
185 spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
186 return 1;
187 }
188 __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
189 return 0;
190 }
191
192 #include <linux/rwlock_api_smp.h>
193
194 #endif /* __LINUX_SPINLOCK_API_SMP_H */