Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef __LINUX_RWLOCK_API_SMP_H
2#define __LINUX_RWLOCK_API_SMP_H
3
4#ifndef __LINUX_SPINLOCK_API_SMP_H
5# error "Please do not include this file directly."
6#endif
7
8/*
9 * include/linux/rwlock_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
18void __lockfunc _raw_read_lock(rwlock_t *lock) __acquires_shared(lock);
19void __lockfunc _raw_write_lock(rwlock_t *lock) __acquires(lock);
20void __lockfunc _raw_write_lock_nested(rwlock_t *lock, int subclass) __acquires(lock);
21void __lockfunc _raw_read_lock_bh(rwlock_t *lock) __acquires_shared(lock);
22void __lockfunc _raw_write_lock_bh(rwlock_t *lock) __acquires(lock);
23void __lockfunc _raw_read_lock_irq(rwlock_t *lock) __acquires_shared(lock);
24void __lockfunc _raw_write_lock_irq(rwlock_t *lock) __acquires(lock);
25unsigned long __lockfunc _raw_read_lock_irqsave(rwlock_t *lock)
26 __acquires_shared(lock);
27unsigned long __lockfunc _raw_write_lock_irqsave(rwlock_t *lock)
28 __acquires(lock);
29int __lockfunc _raw_read_trylock(rwlock_t *lock) __cond_acquires_shared(true, lock);
30int __lockfunc _raw_write_trylock(rwlock_t *lock) __cond_acquires(true, lock);
31void __lockfunc _raw_read_unlock(rwlock_t *lock) __releases_shared(lock);
32void __lockfunc _raw_write_unlock(rwlock_t *lock) __releases(lock);
33void __lockfunc _raw_read_unlock_bh(rwlock_t *lock) __releases_shared(lock);
34void __lockfunc _raw_write_unlock_bh(rwlock_t *lock) __releases(lock);
35void __lockfunc _raw_read_unlock_irq(rwlock_t *lock) __releases_shared(lock);
36void __lockfunc _raw_write_unlock_irq(rwlock_t *lock) __releases(lock);
37void __lockfunc
38_raw_read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
39 __releases_shared(lock);
40void __lockfunc
41_raw_write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
42 __releases(lock);
43
44#ifdef CONFIG_INLINE_READ_LOCK
45#define _raw_read_lock(lock) __raw_read_lock(lock)
46#endif
47
48#ifdef CONFIG_INLINE_WRITE_LOCK
49#define _raw_write_lock(lock) __raw_write_lock(lock)
50#endif
51
52#ifdef CONFIG_INLINE_READ_LOCK_BH
53#define _raw_read_lock_bh(lock) __raw_read_lock_bh(lock)
54#endif
55
56#ifdef CONFIG_INLINE_WRITE_LOCK_BH
57#define _raw_write_lock_bh(lock) __raw_write_lock_bh(lock)
58#endif
59
60#ifdef CONFIG_INLINE_READ_LOCK_IRQ
61#define _raw_read_lock_irq(lock) __raw_read_lock_irq(lock)
62#endif
63
64#ifdef CONFIG_INLINE_WRITE_LOCK_IRQ
65#define _raw_write_lock_irq(lock) __raw_write_lock_irq(lock)
66#endif
67
68#ifdef CONFIG_INLINE_READ_LOCK_IRQSAVE
69#define _raw_read_lock_irqsave(lock) __raw_read_lock_irqsave(lock)
70#endif
71
72#ifdef CONFIG_INLINE_WRITE_LOCK_IRQSAVE
73#define _raw_write_lock_irqsave(lock) __raw_write_lock_irqsave(lock)
74#endif
75
76#ifdef CONFIG_INLINE_READ_TRYLOCK
77#define _raw_read_trylock(lock) __raw_read_trylock(lock)
78#endif
79
80#ifdef CONFIG_INLINE_WRITE_TRYLOCK
81#define _raw_write_trylock(lock) __raw_write_trylock(lock)
82#endif
83
84#ifdef CONFIG_INLINE_READ_UNLOCK
85#define _raw_read_unlock(lock) __raw_read_unlock(lock)
86#endif
87
88#ifdef CONFIG_INLINE_WRITE_UNLOCK
89#define _raw_write_unlock(lock) __raw_write_unlock(lock)
90#endif
91
92#ifdef CONFIG_INLINE_READ_UNLOCK_BH
93#define _raw_read_unlock_bh(lock) __raw_read_unlock_bh(lock)
94#endif
95
96#ifdef CONFIG_INLINE_WRITE_UNLOCK_BH
97#define _raw_write_unlock_bh(lock) __raw_write_unlock_bh(lock)
98#endif
99
100#ifdef CONFIG_INLINE_READ_UNLOCK_IRQ
101#define _raw_read_unlock_irq(lock) __raw_read_unlock_irq(lock)
102#endif
103
104#ifdef CONFIG_INLINE_WRITE_UNLOCK_IRQ
105#define _raw_write_unlock_irq(lock) __raw_write_unlock_irq(lock)
106#endif
107
108#ifdef CONFIG_INLINE_READ_UNLOCK_IRQRESTORE
109#define _raw_read_unlock_irqrestore(lock, flags) \
110 __raw_read_unlock_irqrestore(lock, flags)
111#endif
112
113#ifdef CONFIG_INLINE_WRITE_UNLOCK_IRQRESTORE
114#define _raw_write_unlock_irqrestore(lock, flags) \
115 __raw_write_unlock_irqrestore(lock, flags)
116#endif
117
118static inline int __raw_read_trylock(rwlock_t *lock)
119 __cond_acquires_shared(true, lock)
120{
121 preempt_disable();
122 if (do_raw_read_trylock(lock)) {
123 rwlock_acquire_read(&lock->dep_map, 0, 1, _RET_IP_);
124 return 1;
125 }
126 preempt_enable();
127 return 0;
128}
129
130static inline int __raw_write_trylock(rwlock_t *lock)
131 __cond_acquires(true, lock)
132{
133 preempt_disable();
134 if (do_raw_write_trylock(lock)) {
135 rwlock_acquire(&lock->dep_map, 0, 1, _RET_IP_);
136 return 1;
137 }
138 preempt_enable();
139 return 0;
140}
141
142static inline bool _raw_write_trylock_irqsave(rwlock_t *lock, unsigned long *flags)
143 __cond_acquires(true, lock) __no_context_analysis
144{
145 local_irq_save(*flags);
146 if (_raw_write_trylock(lock))
147 return true;
148 local_irq_restore(*flags);
149 return false;
150}
151
152/*
153 * If lockdep is enabled then we use the non-preemption spin-ops
154 * even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
155 * not re-enabled during lock-acquire (which the preempt-spin-ops do):
156 */
157#if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)
158
159static inline void __raw_read_lock(rwlock_t *lock)
160 __acquires_shared(lock) __no_context_analysis
161{
162 preempt_disable();
163 rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
164 LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
165}
166
167static inline unsigned long __raw_read_lock_irqsave(rwlock_t *lock)
168 __acquires_shared(lock) __no_context_analysis
169{
170 unsigned long flags;
171
172 local_irq_save(flags);
173 preempt_disable();
174 rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
175 LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
176 return flags;
177}
178
179static inline void __raw_read_lock_irq(rwlock_t *lock)
180 __acquires_shared(lock) __no_context_analysis
181{
182 local_irq_disable();
183 preempt_disable();
184 rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
185 LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
186}
187
188static inline void __raw_read_lock_bh(rwlock_t *lock)
189 __acquires_shared(lock) __no_context_analysis
190{
191 __local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
192 rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
193 LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
194}
195
196static inline unsigned long __raw_write_lock_irqsave(rwlock_t *lock)
197 __acquires(lock) __no_context_analysis
198{
199 unsigned long flags;
200
201 local_irq_save(flags);
202 preempt_disable();
203 rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
204 LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
205 return flags;
206}
207
208static inline void __raw_write_lock_irq(rwlock_t *lock)
209 __acquires(lock) __no_context_analysis
210{
211 local_irq_disable();
212 preempt_disable();
213 rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
214 LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
215}
216
217static inline void __raw_write_lock_bh(rwlock_t *lock)
218 __acquires(lock) __no_context_analysis
219{
220 __local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
221 rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
222 LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
223}
224
225static inline void __raw_write_lock(rwlock_t *lock)
226 __acquires(lock) __no_context_analysis
227{
228 preempt_disable();
229 rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
230 LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
231}
232
233static inline void __raw_write_lock_nested(rwlock_t *lock, int subclass)
234 __acquires(lock) __no_context_analysis
235{
236 preempt_disable();
237 rwlock_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
238 LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
239}
240
241#endif /* !CONFIG_GENERIC_LOCKBREAK || CONFIG_DEBUG_LOCK_ALLOC */
242
243static inline void __raw_write_unlock(rwlock_t *lock)
244 __releases(lock)
245{
246 rwlock_release(&lock->dep_map, _RET_IP_);
247 do_raw_write_unlock(lock);
248 preempt_enable();
249}
250
251static inline void __raw_read_unlock(rwlock_t *lock)
252 __releases_shared(lock)
253{
254 rwlock_release(&lock->dep_map, _RET_IP_);
255 do_raw_read_unlock(lock);
256 preempt_enable();
257}
258
259static inline void
260__raw_read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
261 __releases_shared(lock)
262{
263 rwlock_release(&lock->dep_map, _RET_IP_);
264 do_raw_read_unlock(lock);
265 local_irq_restore(flags);
266 preempt_enable();
267}
268
269static inline void __raw_read_unlock_irq(rwlock_t *lock)
270 __releases_shared(lock)
271{
272 rwlock_release(&lock->dep_map, _RET_IP_);
273 do_raw_read_unlock(lock);
274 local_irq_enable();
275 preempt_enable();
276}
277
278static inline void __raw_read_unlock_bh(rwlock_t *lock)
279 __releases_shared(lock)
280{
281 rwlock_release(&lock->dep_map, _RET_IP_);
282 do_raw_read_unlock(lock);
283 __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
284}
285
286static inline void __raw_write_unlock_irqrestore(rwlock_t *lock,
287 unsigned long flags)
288 __releases(lock)
289{
290 rwlock_release(&lock->dep_map, _RET_IP_);
291 do_raw_write_unlock(lock);
292 local_irq_restore(flags);
293 preempt_enable();
294}
295
296static inline void __raw_write_unlock_irq(rwlock_t *lock)
297 __releases(lock)
298{
299 rwlock_release(&lock->dep_map, _RET_IP_);
300 do_raw_write_unlock(lock);
301 local_irq_enable();
302 preempt_enable();
303}
304
305static inline void __raw_write_unlock_bh(rwlock_t *lock)
306 __releases(lock)
307{
308 rwlock_release(&lock->dep_map, _RET_IP_);
309 do_raw_write_unlock(lock);
310 __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
311}
312
313#endif /* __LINUX_RWLOCK_API_SMP_H */