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1da177e4 LT |
1 | /* |
2 | * Copyright (2004) Linus Torvalds | |
3 | * | |
4 | * Author: Zwane Mwaikambo <zwane@fsmlabs.com> | |
5 | * | |
fb1c8f93 IM |
6 | * Copyright (2004, 2005) Ingo Molnar |
7 | * | |
8 | * This file contains the spinlock/rwlock implementations for the | |
9 | * SMP and the DEBUG_SPINLOCK cases. (UP-nondebug inlines them) | |
0cb91a22 AK |
10 | * |
11 | * Note that some architectures have special knowledge about the | |
12 | * stack frames of these functions in their profile_pc. If you | |
13 | * change anything significant here that could change the stack | |
14 | * frame contact the architecture maintainers. | |
1da177e4 LT |
15 | */ |
16 | ||
1da177e4 LT |
17 | #include <linux/linkage.h> |
18 | #include <linux/preempt.h> | |
19 | #include <linux/spinlock.h> | |
20 | #include <linux/interrupt.h> | |
8a25d5de | 21 | #include <linux/debug_locks.h> |
1da177e4 LT |
22 | #include <linux/module.h> |
23 | ||
1da177e4 LT |
24 | int __lockfunc _spin_trylock(spinlock_t *lock) |
25 | { | |
69d0ee73 | 26 | return __spin_trylock(lock); |
1da177e4 LT |
27 | } |
28 | EXPORT_SYMBOL(_spin_trylock); | |
29 | ||
30 | int __lockfunc _read_trylock(rwlock_t *lock) | |
31 | { | |
69d0ee73 | 32 | return __read_trylock(lock); |
1da177e4 LT |
33 | } |
34 | EXPORT_SYMBOL(_read_trylock); | |
35 | ||
36 | int __lockfunc _write_trylock(rwlock_t *lock) | |
37 | { | |
69d0ee73 | 38 | return __write_trylock(lock); |
1da177e4 LT |
39 | } |
40 | EXPORT_SYMBOL(_write_trylock); | |
41 | ||
8a25d5de IM |
42 | /* |
43 | * If lockdep is enabled then we use the non-preemption spin-ops | |
44 | * even on CONFIG_PREEMPT, because lockdep assumes that interrupts are | |
45 | * not re-enabled during lock-acquire (which the preempt-spin-ops do): | |
46 | */ | |
95c354fe | 47 | #if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC) |
1da177e4 LT |
48 | |
49 | void __lockfunc _read_lock(rwlock_t *lock) | |
50 | { | |
69d0ee73 | 51 | __read_lock(lock); |
1da177e4 LT |
52 | } |
53 | EXPORT_SYMBOL(_read_lock); | |
54 | ||
55 | unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock) | |
56 | { | |
69d0ee73 | 57 | return __spin_lock_irqsave(lock); |
1da177e4 LT |
58 | } |
59 | EXPORT_SYMBOL(_spin_lock_irqsave); | |
60 | ||
61 | void __lockfunc _spin_lock_irq(spinlock_t *lock) | |
62 | { | |
69d0ee73 | 63 | __spin_lock_irq(lock); |
1da177e4 LT |
64 | } |
65 | EXPORT_SYMBOL(_spin_lock_irq); | |
66 | ||
67 | void __lockfunc _spin_lock_bh(spinlock_t *lock) | |
68 | { | |
69d0ee73 | 69 | __spin_lock_bh(lock); |
1da177e4 LT |
70 | } |
71 | EXPORT_SYMBOL(_spin_lock_bh); | |
72 | ||
73 | unsigned long __lockfunc _read_lock_irqsave(rwlock_t *lock) | |
74 | { | |
69d0ee73 | 75 | return __read_lock_irqsave(lock); |
1da177e4 LT |
76 | } |
77 | EXPORT_SYMBOL(_read_lock_irqsave); | |
78 | ||
79 | void __lockfunc _read_lock_irq(rwlock_t *lock) | |
80 | { | |
69d0ee73 | 81 | __read_lock_irq(lock); |
1da177e4 LT |
82 | } |
83 | EXPORT_SYMBOL(_read_lock_irq); | |
84 | ||
85 | void __lockfunc _read_lock_bh(rwlock_t *lock) | |
86 | { | |
69d0ee73 | 87 | __read_lock_bh(lock); |
1da177e4 LT |
88 | } |
89 | EXPORT_SYMBOL(_read_lock_bh); | |
90 | ||
91 | unsigned long __lockfunc _write_lock_irqsave(rwlock_t *lock) | |
92 | { | |
69d0ee73 | 93 | return __write_lock_irqsave(lock); |
1da177e4 LT |
94 | } |
95 | EXPORT_SYMBOL(_write_lock_irqsave); | |
96 | ||
97 | void __lockfunc _write_lock_irq(rwlock_t *lock) | |
98 | { | |
69d0ee73 | 99 | __write_lock_irq(lock); |
1da177e4 LT |
100 | } |
101 | EXPORT_SYMBOL(_write_lock_irq); | |
102 | ||
103 | void __lockfunc _write_lock_bh(rwlock_t *lock) | |
104 | { | |
69d0ee73 | 105 | __write_lock_bh(lock); |
1da177e4 LT |
106 | } |
107 | EXPORT_SYMBOL(_write_lock_bh); | |
108 | ||
109 | void __lockfunc _spin_lock(spinlock_t *lock) | |
110 | { | |
69d0ee73 | 111 | __spin_lock(lock); |
1da177e4 | 112 | } |
1da177e4 LT |
113 | EXPORT_SYMBOL(_spin_lock); |
114 | ||
115 | void __lockfunc _write_lock(rwlock_t *lock) | |
116 | { | |
69d0ee73 | 117 | __write_lock(lock); |
1da177e4 | 118 | } |
1da177e4 LT |
119 | EXPORT_SYMBOL(_write_lock); |
120 | ||
121 | #else /* CONFIG_PREEMPT: */ | |
122 | ||
123 | /* | |
124 | * This could be a long-held lock. We both prepare to spin for a long | |
125 | * time (making _this_ CPU preemptable if possible), and we also signal | |
126 | * towards that other CPU that it should break the lock ASAP. | |
127 | * | |
128 | * (We do this in a function because inlining it would be excessive.) | |
129 | */ | |
130 | ||
131 | #define BUILD_LOCK_OPS(op, locktype) \ | |
132 | void __lockfunc _##op##_lock(locktype##_t *lock) \ | |
133 | { \ | |
1da177e4 | 134 | for (;;) { \ |
ee25e96f | 135 | preempt_disable(); \ |
1da177e4 LT |
136 | if (likely(_raw_##op##_trylock(lock))) \ |
137 | break; \ | |
138 | preempt_enable(); \ | |
ee25e96f | 139 | \ |
1da177e4 LT |
140 | if (!(lock)->break_lock) \ |
141 | (lock)->break_lock = 1; \ | |
142 | while (!op##_can_lock(lock) && (lock)->break_lock) \ | |
ef6edc97 | 143 | _raw_##op##_relax(&lock->raw_lock); \ |
1da177e4 LT |
144 | } \ |
145 | (lock)->break_lock = 0; \ | |
146 | } \ | |
147 | \ | |
148 | EXPORT_SYMBOL(_##op##_lock); \ | |
149 | \ | |
150 | unsigned long __lockfunc _##op##_lock_irqsave(locktype##_t *lock) \ | |
151 | { \ | |
152 | unsigned long flags; \ | |
153 | \ | |
1da177e4 | 154 | for (;;) { \ |
ee25e96f | 155 | preempt_disable(); \ |
1da177e4 LT |
156 | local_irq_save(flags); \ |
157 | if (likely(_raw_##op##_trylock(lock))) \ | |
158 | break; \ | |
159 | local_irq_restore(flags); \ | |
1da177e4 | 160 | preempt_enable(); \ |
ee25e96f | 161 | \ |
1da177e4 LT |
162 | if (!(lock)->break_lock) \ |
163 | (lock)->break_lock = 1; \ | |
164 | while (!op##_can_lock(lock) && (lock)->break_lock) \ | |
ef6edc97 | 165 | _raw_##op##_relax(&lock->raw_lock); \ |
1da177e4 LT |
166 | } \ |
167 | (lock)->break_lock = 0; \ | |
168 | return flags; \ | |
169 | } \ | |
170 | \ | |
171 | EXPORT_SYMBOL(_##op##_lock_irqsave); \ | |
172 | \ | |
173 | void __lockfunc _##op##_lock_irq(locktype##_t *lock) \ | |
174 | { \ | |
175 | _##op##_lock_irqsave(lock); \ | |
176 | } \ | |
177 | \ | |
178 | EXPORT_SYMBOL(_##op##_lock_irq); \ | |
179 | \ | |
180 | void __lockfunc _##op##_lock_bh(locktype##_t *lock) \ | |
181 | { \ | |
182 | unsigned long flags; \ | |
183 | \ | |
184 | /* */ \ | |
185 | /* Careful: we must exclude softirqs too, hence the */ \ | |
186 | /* irq-disabling. We use the generic preemption-aware */ \ | |
187 | /* function: */ \ | |
188 | /**/ \ | |
189 | flags = _##op##_lock_irqsave(lock); \ | |
190 | local_bh_disable(); \ | |
191 | local_irq_restore(flags); \ | |
192 | } \ | |
193 | \ | |
194 | EXPORT_SYMBOL(_##op##_lock_bh) | |
195 | ||
196 | /* | |
197 | * Build preemption-friendly versions of the following | |
198 | * lock-spinning functions: | |
199 | * | |
200 | * _[spin|read|write]_lock() | |
201 | * _[spin|read|write]_lock_irq() | |
202 | * _[spin|read|write]_lock_irqsave() | |
203 | * _[spin|read|write]_lock_bh() | |
204 | */ | |
205 | BUILD_LOCK_OPS(spin, spinlock); | |
206 | BUILD_LOCK_OPS(read, rwlock); | |
207 | BUILD_LOCK_OPS(write, rwlock); | |
208 | ||
209 | #endif /* CONFIG_PREEMPT */ | |
210 | ||
8a25d5de IM |
211 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
212 | ||
213 | void __lockfunc _spin_lock_nested(spinlock_t *lock, int subclass) | |
214 | { | |
215 | preempt_disable(); | |
216 | spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_); | |
4fe87745 | 217 | LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock); |
8a25d5de | 218 | } |
8a25d5de | 219 | EXPORT_SYMBOL(_spin_lock_nested); |
b7d39aff | 220 | |
cfd3ef23 AV |
221 | unsigned long __lockfunc _spin_lock_irqsave_nested(spinlock_t *lock, int subclass) |
222 | { | |
223 | unsigned long flags; | |
224 | ||
225 | local_irq_save(flags); | |
226 | preempt_disable(); | |
227 | spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_); | |
e8c158bb RH |
228 | LOCK_CONTENDED_FLAGS(lock, _raw_spin_trylock, _raw_spin_lock, |
229 | _raw_spin_lock_flags, &flags); | |
cfd3ef23 AV |
230 | return flags; |
231 | } | |
cfd3ef23 | 232 | EXPORT_SYMBOL(_spin_lock_irqsave_nested); |
8a25d5de | 233 | |
b7d39aff PZ |
234 | void __lockfunc _spin_lock_nest_lock(spinlock_t *lock, |
235 | struct lockdep_map *nest_lock) | |
236 | { | |
237 | preempt_disable(); | |
238 | spin_acquire_nest(&lock->dep_map, 0, 0, nest_lock, _RET_IP_); | |
239 | LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock); | |
240 | } | |
b7d39aff PZ |
241 | EXPORT_SYMBOL(_spin_lock_nest_lock); |
242 | ||
8a25d5de IM |
243 | #endif |
244 | ||
1da177e4 LT |
245 | void __lockfunc _spin_unlock(spinlock_t *lock) |
246 | { | |
69d0ee73 | 247 | __spin_unlock(lock); |
1da177e4 LT |
248 | } |
249 | EXPORT_SYMBOL(_spin_unlock); | |
250 | ||
251 | void __lockfunc _write_unlock(rwlock_t *lock) | |
252 | { | |
69d0ee73 | 253 | __write_unlock(lock); |
1da177e4 LT |
254 | } |
255 | EXPORT_SYMBOL(_write_unlock); | |
256 | ||
257 | void __lockfunc _read_unlock(rwlock_t *lock) | |
258 | { | |
69d0ee73 | 259 | __read_unlock(lock); |
1da177e4 LT |
260 | } |
261 | EXPORT_SYMBOL(_read_unlock); | |
262 | ||
263 | void __lockfunc _spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags) | |
264 | { | |
69d0ee73 | 265 | __spin_unlock_irqrestore(lock, flags); |
1da177e4 LT |
266 | } |
267 | EXPORT_SYMBOL(_spin_unlock_irqrestore); | |
268 | ||
269 | void __lockfunc _spin_unlock_irq(spinlock_t *lock) | |
270 | { | |
69d0ee73 | 271 | __spin_unlock_irq(lock); |
1da177e4 LT |
272 | } |
273 | EXPORT_SYMBOL(_spin_unlock_irq); | |
274 | ||
275 | void __lockfunc _spin_unlock_bh(spinlock_t *lock) | |
276 | { | |
69d0ee73 | 277 | __spin_unlock_bh(lock); |
1da177e4 LT |
278 | } |
279 | EXPORT_SYMBOL(_spin_unlock_bh); | |
280 | ||
281 | void __lockfunc _read_unlock_irqrestore(rwlock_t *lock, unsigned long flags) | |
282 | { | |
69d0ee73 | 283 | __read_unlock_irqrestore(lock, flags); |
1da177e4 LT |
284 | } |
285 | EXPORT_SYMBOL(_read_unlock_irqrestore); | |
286 | ||
287 | void __lockfunc _read_unlock_irq(rwlock_t *lock) | |
288 | { | |
69d0ee73 | 289 | __read_unlock_irq(lock); |
1da177e4 LT |
290 | } |
291 | EXPORT_SYMBOL(_read_unlock_irq); | |
292 | ||
293 | void __lockfunc _read_unlock_bh(rwlock_t *lock) | |
294 | { | |
69d0ee73 | 295 | __read_unlock_bh(lock); |
1da177e4 LT |
296 | } |
297 | EXPORT_SYMBOL(_read_unlock_bh); | |
298 | ||
299 | void __lockfunc _write_unlock_irqrestore(rwlock_t *lock, unsigned long flags) | |
300 | { | |
69d0ee73 | 301 | __write_unlock_irqrestore(lock, flags); |
1da177e4 LT |
302 | } |
303 | EXPORT_SYMBOL(_write_unlock_irqrestore); | |
304 | ||
305 | void __lockfunc _write_unlock_irq(rwlock_t *lock) | |
306 | { | |
69d0ee73 | 307 | __write_unlock_irq(lock); |
1da177e4 LT |
308 | } |
309 | EXPORT_SYMBOL(_write_unlock_irq); | |
310 | ||
311 | void __lockfunc _write_unlock_bh(rwlock_t *lock) | |
312 | { | |
69d0ee73 | 313 | __write_unlock_bh(lock); |
1da177e4 LT |
314 | } |
315 | EXPORT_SYMBOL(_write_unlock_bh); | |
316 | ||
317 | int __lockfunc _spin_trylock_bh(spinlock_t *lock) | |
318 | { | |
69d0ee73 | 319 | return __spin_trylock_bh(lock); |
1da177e4 LT |
320 | } |
321 | EXPORT_SYMBOL(_spin_trylock_bh); | |
322 | ||
0764d23c | 323 | notrace int in_lock_functions(unsigned long addr) |
1da177e4 LT |
324 | { |
325 | /* Linker adds these: start and end of __lockfunc functions */ | |
326 | extern char __lock_text_start[], __lock_text_end[]; | |
327 | ||
328 | return addr >= (unsigned long)__lock_text_start | |
329 | && addr < (unsigned long)__lock_text_end; | |
330 | } | |
331 | EXPORT_SYMBOL(in_lock_functions); |