1#ifndef __LINUX_SPINLOCK_H
2#define __LINUX_SPINLOCK_H
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49#include <linux/preempt.h>
50#include <linux/linkage.h>
51#include <linux/compiler.h>
52#include <linux/thread_info.h>
53#include <linux/kernel.h>
54#include <linux/stringify.h>
55#include <linux/bottom_half.h>
56
57#include <asm/system.h>
58
59
60
61
62#define LOCK_SECTION_NAME ".text.lock."KBUILD_BASENAME
63
64#define LOCK_SECTION_START(extra) \
65 ".subsection 1\n\t" \
66 extra \
67 ".ifndef " LOCK_SECTION_NAME "\n\t" \
68 LOCK_SECTION_NAME ":\n\t" \
69 ".endif\n"
70
71#define LOCK_SECTION_END \
72 ".previous\n\t"
73
74#define __lockfunc fastcall __attribute__((section(".spinlock.text")))
75
76
77
78
79#include <linux/spinlock_types.h>
80
81extern int __lockfunc generic__raw_read_trylock(raw_rwlock_t *lock);
82
83
84
85
86#ifdef CONFIG_SMP
87# include <asm/spinlock.h>
88#else
89# include <linux/spinlock_up.h>
90#endif
91
92#ifdef CONFIG_DEBUG_SPINLOCK
93 extern void __spin_lock_init(spinlock_t *lock, const char *name,
94 struct lock_class_key *key);
95# define spin_lock_init(lock) \
96do { \
97 static struct lock_class_key __key; \
98 \
99 __spin_lock_init((lock), #lock, &__key); \
100} while (0)
101
102#else
103# define spin_lock_init(lock) \
104 do { *(lock) = SPIN_LOCK_UNLOCKED; } while (0)
105#endif
106
107#ifdef CONFIG_DEBUG_SPINLOCK
108 extern void __rwlock_init(rwlock_t *lock, const char *name,
109 struct lock_class_key *key);
110# define rwlock_init(lock) \
111do { \
112 static struct lock_class_key __key; \
113 \
114 __rwlock_init((lock), #lock, &__key); \
115} while (0)
116#else
117# define rwlock_init(lock) \
118 do { *(lock) = RW_LOCK_UNLOCKED; } while (0)
119#endif
120
121#define spin_is_locked(lock) __raw_spin_is_locked(&(lock)->raw_lock)
122
123
124
125
126
127#define spin_unlock_wait(lock) __raw_spin_unlock_wait(&(lock)->raw_lock)
128
129
130
131
132#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
133# include <linux/spinlock_api_smp.h>
134#else
135# include <linux/spinlock_api_up.h>
136#endif
137
138#ifdef CONFIG_DEBUG_SPINLOCK
139 extern void _raw_spin_lock(spinlock_t *lock);
140#define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock)
141 extern int _raw_spin_trylock(spinlock_t *lock);
142 extern void _raw_spin_unlock(spinlock_t *lock);
143 extern void _raw_read_lock(rwlock_t *lock);
144 extern int _raw_read_trylock(rwlock_t *lock);
145 extern void _raw_read_unlock(rwlock_t *lock);
146 extern void _raw_write_lock(rwlock_t *lock);
147 extern int _raw_write_trylock(rwlock_t *lock);
148 extern void _raw_write_unlock(rwlock_t *lock);
149#else
150# define _raw_spin_lock(lock) __raw_spin_lock(&(lock)->raw_lock)
151# define _raw_spin_lock_flags(lock, flags) \
152 __raw_spin_lock_flags(&(lock)->raw_lock, *(flags))
153# define _raw_spin_trylock(lock) __raw_spin_trylock(&(lock)->raw_lock)
154# define _raw_spin_unlock(lock) __raw_spin_unlock(&(lock)->raw_lock)
155# define _raw_read_lock(rwlock) __raw_read_lock(&(rwlock)->raw_lock)
156# define _raw_read_trylock(rwlock) __raw_read_trylock(&(rwlock)->raw_lock)
157# define _raw_read_unlock(rwlock) __raw_read_unlock(&(rwlock)->raw_lock)
158# define _raw_write_lock(rwlock) __raw_write_lock(&(rwlock)->raw_lock)
159# define _raw_write_trylock(rwlock) __raw_write_trylock(&(rwlock)->raw_lock)
160# define _raw_write_unlock(rwlock) __raw_write_unlock(&(rwlock)->raw_lock)
161#endif
162
163#define read_can_lock(rwlock) __raw_read_can_lock(&(rwlock)->raw_lock)
164#define write_can_lock(rwlock) __raw_write_can_lock(&(rwlock)->raw_lock)
165
166
167
168
169
170
171#define spin_trylock(lock) __cond_lock(lock, _spin_trylock(lock))
172#define read_trylock(lock) __cond_lock(lock, _read_trylock(lock))
173#define write_trylock(lock) __cond_lock(lock, _write_trylock(lock))
174
175#define spin_lock(lock) _spin_lock(lock)
176
177#ifdef CONFIG_DEBUG_LOCK_ALLOC
178# define spin_lock_nested(lock, subclass) _spin_lock_nested(lock, subclass)
179#else
180# define spin_lock_nested(lock, subclass) _spin_lock(lock)
181#endif
182
183#define write_lock(lock) _write_lock(lock)
184#define read_lock(lock) _read_lock(lock)
185
186#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
187
188#define spin_lock_irqsave(lock, flags) flags = _spin_lock_irqsave(lock)
189#define read_lock_irqsave(lock, flags) flags = _read_lock_irqsave(lock)
190#define write_lock_irqsave(lock, flags) flags = _write_lock_irqsave(lock)
191
192#ifdef CONFIG_DEBUG_LOCK_ALLOC
193#define spin_lock_irqsave_nested(lock, flags, subclass) \
194 flags = _spin_lock_irqsave_nested(lock, subclass)
195#else
196#define spin_lock_irqsave_nested(lock, flags, subclass) \
197 flags = _spin_lock_irqsave(lock)
198#endif
199
200#else
201
202#define spin_lock_irqsave(lock, flags) _spin_lock_irqsave(lock, flags)
203#define read_lock_irqsave(lock, flags) _read_lock_irqsave(lock, flags)
204#define write_lock_irqsave(lock, flags) _write_lock_irqsave(lock, flags)
205#define spin_lock_irqsave_nested(lock, flags, subclass) \
206 spin_lock_irqsave(lock, flags)
207
208#endif
209
210#define spin_lock_irq(lock) _spin_lock_irq(lock)
211#define spin_lock_bh(lock) _spin_lock_bh(lock)
212
213#define read_lock_irq(lock) _read_lock_irq(lock)
214#define read_lock_bh(lock) _read_lock_bh(lock)
215
216#define write_lock_irq(lock) _write_lock_irq(lock)
217#define write_lock_bh(lock) _write_lock_bh(lock)
218
219
220
221
222#if defined(CONFIG_DEBUG_SPINLOCK) || defined(CONFIG_PREEMPT) || \
223 !defined(CONFIG_SMP)
224# define spin_unlock(lock) _spin_unlock(lock)
225# define read_unlock(lock) _read_unlock(lock)
226# define write_unlock(lock) _write_unlock(lock)
227# define spin_unlock_irq(lock) _spin_unlock_irq(lock)
228# define read_unlock_irq(lock) _read_unlock_irq(lock)
229# define write_unlock_irq(lock) _write_unlock_irq(lock)
230#else
231# define spin_unlock(lock) \
232 do {__raw_spin_unlock(&(lock)->raw_lock); __release(lock); } while (0)
233# define read_unlock(lock) \
234 do {__raw_read_unlock(&(lock)->raw_lock); __release(lock); } while (0)
235# define write_unlock(lock) \
236 do {__raw_write_unlock(&(lock)->raw_lock); __release(lock); } while (0)
237# define spin_unlock_irq(lock) \
238do { \
239 __raw_spin_unlock(&(lock)->raw_lock); \
240 __release(lock); \
241 local_irq_enable(); \
242} while (0)
243# define read_unlock_irq(lock) \
244do { \
245 __raw_read_unlock(&(lock)->raw_lock); \
246 __release(lock); \
247 local_irq_enable(); \
248} while (0)
249# define write_unlock_irq(lock) \
250do { \
251 __raw_write_unlock(&(lock)->raw_lock); \
252 __release(lock); \
253 local_irq_enable(); \
254} while (0)
255#endif
256
257#define spin_unlock_irqrestore(lock, flags) \
258 _spin_unlock_irqrestore(lock, flags)
259#define spin_unlock_bh(lock) _spin_unlock_bh(lock)
260
261#define read_unlock_irqrestore(lock, flags) \
262 _read_unlock_irqrestore(lock, flags)
263#define read_unlock_bh(lock) _read_unlock_bh(lock)
264
265#define write_unlock_irqrestore(lock, flags) \
266 _write_unlock_irqrestore(lock, flags)
267#define write_unlock_bh(lock) _write_unlock_bh(lock)
268
269#define spin_trylock_bh(lock) __cond_lock(lock, _spin_trylock_bh(lock))
270
271#define spin_trylock_irq(lock) \
272({ \
273 local_irq_disable(); \
274 spin_trylock(lock) ? \
275 1 : ({ local_irq_enable(); 0; }); \
276})
277
278#define spin_trylock_irqsave(lock, flags) \
279({ \
280 local_irq_save(flags); \
281 spin_trylock(lock) ? \
282 1 : ({ local_irq_restore(flags); 0; }); \
283})
284
285#define write_trylock_irqsave(lock, flags) \
286({ \
287 local_irq_save(flags); \
288 write_trylock(lock) ? \
289 1 : ({ local_irq_restore(flags); 0; }); \
290})
291
292
293
294
295
296static inline void double_spin_lock(spinlock_t *l1, spinlock_t *l2,
297 bool l1_first)
298 __acquires(l1)
299 __acquires(l2)
300{
301 if (l1_first) {
302 spin_lock(l1);
303 spin_lock(l2);
304 } else {
305 spin_lock(l2);
306 spin_lock(l1);
307 }
308}
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313
314
315static inline void double_spin_unlock(spinlock_t *l1, spinlock_t *l2,
316 bool l1_taken_first)
317 __releases(l1)
318 __releases(l2)
319{
320 if (l1_taken_first) {
321 spin_unlock(l2);
322 spin_unlock(l1);
323 } else {
324 spin_unlock(l1);
325 spin_unlock(l2);
326 }
327}
328
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331
332
333#include <asm/atomic.h>
334
335
336
337
338
339extern int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock);
340#define atomic_dec_and_lock(atomic, lock) \
341 __cond_lock(lock, _atomic_dec_and_lock(atomic, lock))
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343
344
345
346
347#define spin_can_lock(lock) (!spin_is_locked(lock))
348
349#endif
350