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(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(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{
120 preempt_disable();
121 if (do_raw_read_trylock(lock)) {
122 rwlock_acquire_read(&lock->dep_map, 0, 1, _RET_IP_);
123 return 1;
124 }
125 preempt_enable();
126 return 0;
127}
128
129static inline int __raw_write_trylock(rwlock_t *lock)
130{
131 preempt_disable();
132 if (do_raw_write_trylock(lock)) {
133 rwlock_acquire(&lock->dep_map, 0, 1, _RET_IP_);
134 return 1;
135 }
136 preempt_enable();
137 return 0;
138}
139
140static inline bool _raw_write_trylock_irqsave(rwlock_t *lock, unsigned long *flags)
141 __cond_acquires(true, lock) __no_context_analysis
142{
143 local_irq_save(*flags);
144 if (_raw_write_trylock(lock))
145 return true;
146 local_irq_restore(*flags);
147 return false;
148}
149
150/*
151 * If lockdep is enabled then we use the non-preemption spin-ops
152 * even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
153 * not re-enabled during lock-acquire (which the preempt-spin-ops do):
154 */
155#if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)
156
157static inline void __raw_read_lock(rwlock_t *lock)
158 __acquires_shared(lock) __no_context_analysis
159{
160 preempt_disable();
161 rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
162 LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
163}
164
165static inline unsigned long __raw_read_lock_irqsave(rwlock_t *lock)
166 __acquires_shared(lock) __no_context_analysis
167{
168 unsigned long flags;
169
170 local_irq_save(flags);
171 preempt_disable();
172 rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
173 LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
174 return flags;
175}
176
177static inline void __raw_read_lock_irq(rwlock_t *lock)
178 __acquires_shared(lock) __no_context_analysis
179{
180 local_irq_disable();
181 preempt_disable();
182 rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
183 LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
184}
185
186static inline void __raw_read_lock_bh(rwlock_t *lock)
187 __acquires_shared(lock) __no_context_analysis
188{
189 __local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
190 rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
191 LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
192}
193
194static inline unsigned long __raw_write_lock_irqsave(rwlock_t *lock)
195 __acquires(lock) __no_context_analysis
196{
197 unsigned long flags;
198
199 local_irq_save(flags);
200 preempt_disable();
201 rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
202 LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
203 return flags;
204}
205
206static inline void __raw_write_lock_irq(rwlock_t *lock)
207 __acquires(lock) __no_context_analysis
208{
209 local_irq_disable();
210 preempt_disable();
211 rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
212 LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
213}
214
215static inline void __raw_write_lock_bh(rwlock_t *lock)
216 __acquires(lock) __no_context_analysis
217{
218 __local_bh_disable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
219 rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
220 LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
221}
222
223static inline void __raw_write_lock(rwlock_t *lock)
224 __acquires(lock) __no_context_analysis
225{
226 preempt_disable();
227 rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
228 LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
229}
230
231static inline void __raw_write_lock_nested(rwlock_t *lock, int subclass)
232 __acquires(lock) __no_context_analysis
233{
234 preempt_disable();
235 rwlock_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
236 LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
237}
238
239#endif /* !CONFIG_GENERIC_LOCKBREAK || CONFIG_DEBUG_LOCK_ALLOC */
240
241static inline void __raw_write_unlock(rwlock_t *lock)
242 __releases(lock)
243{
244 rwlock_release(&lock->dep_map, _RET_IP_);
245 do_raw_write_unlock(lock);
246 preempt_enable();
247}
248
249static inline void __raw_read_unlock(rwlock_t *lock)
250 __releases_shared(lock)
251{
252 rwlock_release(&lock->dep_map, _RET_IP_);
253 do_raw_read_unlock(lock);
254 preempt_enable();
255}
256
257static inline void
258__raw_read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
259 __releases_shared(lock)
260{
261 rwlock_release(&lock->dep_map, _RET_IP_);
262 do_raw_read_unlock(lock);
263 local_irq_restore(flags);
264 preempt_enable();
265}
266
267static inline void __raw_read_unlock_irq(rwlock_t *lock)
268 __releases_shared(lock)
269{
270 rwlock_release(&lock->dep_map, _RET_IP_);
271 do_raw_read_unlock(lock);
272 local_irq_enable();
273 preempt_enable();
274}
275
276static inline void __raw_read_unlock_bh(rwlock_t *lock)
277 __releases_shared(lock)
278{
279 rwlock_release(&lock->dep_map, _RET_IP_);
280 do_raw_read_unlock(lock);
281 __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
282}
283
284static inline void __raw_write_unlock_irqrestore(rwlock_t *lock,
285 unsigned long flags)
286 __releases(lock)
287{
288 rwlock_release(&lock->dep_map, _RET_IP_);
289 do_raw_write_unlock(lock);
290 local_irq_restore(flags);
291 preempt_enable();
292}
293
294static inline void __raw_write_unlock_irq(rwlock_t *lock)
295 __releases(lock)
296{
297 rwlock_release(&lock->dep_map, _RET_IP_);
298 do_raw_write_unlock(lock);
299 local_irq_enable();
300 preempt_enable();
301}
302
303static inline void __raw_write_unlock_bh(rwlock_t *lock)
304 __releases(lock)
305{
306 rwlock_release(&lock->dep_map, _RET_IP_);
307 do_raw_write_unlock(lock);
308 __local_bh_enable_ip(_RET_IP_, SOFTIRQ_LOCK_OFFSET);
309}
310
311#endif /* __LINUX_RWLOCK_API_SMP_H */