Merge branch 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
[linux-2.6.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
26 _raw_spin_lock_nest_lock(raw_spinlock_t *lock, struct lockdep_map *map)
27                                                                 __acquires(lock);
28 void __lockfunc _raw_spin_lock_bh(raw_spinlock_t *lock)         __acquires(lock);
29 void __lockfunc _raw_spin_lock_irq(raw_spinlock_t *lock)
30                                                                 __acquires(lock);
31
32 unsigned long __lockfunc _raw_spin_lock_irqsave(raw_spinlock_t *lock)
33                                                                 __acquires(lock);
34 unsigned long __lockfunc
35 _raw_spin_lock_irqsave_nested(raw_spinlock_t *lock, int subclass)
36                                                                 __acquires(lock);
37 int __lockfunc _raw_spin_trylock(raw_spinlock_t *lock);
38 int __lockfunc _raw_spin_trylock_bh(raw_spinlock_t *lock);
39 void __lockfunc _raw_spin_unlock(raw_spinlock_t *lock)          __releases(lock);
40 void __lockfunc _raw_spin_unlock_bh(raw_spinlock_t *lock)       __releases(lock);
41 void __lockfunc _raw_spin_unlock_irq(raw_spinlock_t *lock)      __releases(lock);
42 void __lockfunc
43 _raw_spin_unlock_irqrestore(raw_spinlock_t *lock, unsigned long flags)
44                                                                 __releases(lock);
45
46 #ifdef CONFIG_INLINE_SPIN_LOCK
47 #define _raw_spin_lock(lock) __raw_spin_lock(lock)
48 #endif
49
50 #ifdef CONFIG_INLINE_SPIN_LOCK_BH
51 #define _raw_spin_lock_bh(lock) __raw_spin_lock_bh(lock)
52 #endif
53
54 #ifdef CONFIG_INLINE_SPIN_LOCK_IRQ
55 #define _raw_spin_lock_irq(lock) __raw_spin_lock_irq(lock)
56 #endif
57
58 #ifdef CONFIG_INLINE_SPIN_LOCK_IRQSAVE
59 #define _raw_spin_lock_irqsave(lock) __raw_spin_lock_irqsave(lock)
60 #endif
61
62 #ifdef CONFIG_INLINE_SPIN_TRYLOCK
63 #define _raw_spin_trylock(lock) __raw_spin_trylock(lock)
64 #endif
65
66 #ifdef CONFIG_INLINE_SPIN_TRYLOCK_BH
67 #define _raw_spin_trylock_bh(lock) __raw_spin_trylock_bh(lock)
68 #endif
69
70 #ifdef CONFIG_INLINE_SPIN_UNLOCK
71 #define _raw_spin_unlock(lock) __raw_spin_unlock(lock)
72 #endif
73
74 #ifdef CONFIG_INLINE_SPIN_UNLOCK_BH
75 #define _raw_spin_unlock_bh(lock) __raw_spin_unlock_bh(lock)
76 #endif
77
78 #ifdef CONFIG_INLINE_SPIN_UNLOCK_IRQ
79 #define _raw_spin_unlock_irq(lock) __raw_spin_unlock_irq(lock)
80 #endif
81
82 #ifdef CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE
83 #define _raw_spin_unlock_irqrestore(lock, flags) __raw_spin_unlock_irqrestore(lock, flags)
84 #endif
85
86 static inline int __raw_spin_trylock(raw_spinlock_t *lock)
87 {
88         preempt_disable();
89         if (do_raw_spin_trylock(lock)) {
90                 spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
91                 return 1;
92         }
93         preempt_enable();
94         return 0;
95 }
96
97 /*
98  * If lockdep is enabled then we use the non-preemption spin-ops
99  * even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
100  * not re-enabled during lock-acquire (which the preempt-spin-ops do):
101  */
102 #if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)
103
104 static inline unsigned long __raw_spin_lock_irqsave(raw_spinlock_t *lock)
105 {
106         unsigned long flags;
107
108         local_irq_save(flags);
109         preempt_disable();
110         spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
111         /*
112          * On lockdep we dont want the hand-coded irq-enable of
113          * do_raw_spin_lock_flags() code, because lockdep assumes
114          * that interrupts are not re-enabled during lock-acquire:
115          */
116 #ifdef CONFIG_LOCKDEP
117         LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
118 #else
119         do_raw_spin_lock_flags(lock, &flags);
120 #endif
121         return flags;
122 }
123
124 static inline void __raw_spin_lock_irq(raw_spinlock_t *lock)
125 {
126         local_irq_disable();
127         preempt_disable();
128         spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
129         LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
130 }
131
132 static inline void __raw_spin_lock_bh(raw_spinlock_t *lock)
133 {
134         local_bh_disable();
135         preempt_disable();
136         spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
137         LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
138 }
139
140 static inline void __raw_spin_lock(raw_spinlock_t *lock)
141 {
142         preempt_disable();
143         spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
144         LOCK_CONTENDED(lock, do_raw_spin_trylock, do_raw_spin_lock);
145 }
146
147 #endif /* CONFIG_PREEMPT */
148
149 static inline void __raw_spin_unlock(raw_spinlock_t *lock)
150 {
151         spin_release(&lock->dep_map, 1, _RET_IP_);
152         do_raw_spin_unlock(lock);
153         preempt_enable();
154 }
155
156 static inline void __raw_spin_unlock_irqrestore(raw_spinlock_t *lock,
157                                             unsigned long flags)
158 {
159         spin_release(&lock->dep_map, 1, _RET_IP_);
160         do_raw_spin_unlock(lock);
161         local_irq_restore(flags);
162         preempt_enable();
163 }
164
165 static inline void __raw_spin_unlock_irq(raw_spinlock_t *lock)
166 {
167         spin_release(&lock->dep_map, 1, _RET_IP_);
168         do_raw_spin_unlock(lock);
169         local_irq_enable();
170         preempt_enable();
171 }
172
173 static inline void __raw_spin_unlock_bh(raw_spinlock_t *lock)
174 {
175         spin_release(&lock->dep_map, 1, _RET_IP_);
176         do_raw_spin_unlock(lock);
177         preempt_enable_no_resched();
178         local_bh_enable_ip((unsigned long)__builtin_return_address(0));
179 }
180
181 static inline int __raw_spin_trylock_bh(raw_spinlock_t *lock)
182 {
183         local_bh_disable();
184         preempt_disable();
185         if (do_raw_spin_trylock(lock)) {
186                 spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
187                 return 1;
188         }
189         preempt_enable_no_resched();
190         local_bh_enable_ip((unsigned long)__builtin_return_address(0));
191         return 0;
192 }
193
194 #include <linux/rwlock_api_smp.h>
195
196 #endif /* __LINUX_SPINLOCK_API_SMP_H */