Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (2004) Linus Torvalds |
| 3 | * |
| 4 | * Author: Zwane Mwaikambo <zwane@fsmlabs.com> |
| 5 | * |
Ingo Molnar | fb1c8f9 | 2005-09-10 00:25:56 -0700 | [diff] [blame] | 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) |
Andi Kleen | 0cb91a2 | 2006-09-26 10:52:28 +0200 | [diff] [blame^] | 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. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | */ |
| 16 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/linkage.h> |
| 18 | #include <linux/preempt.h> |
| 19 | #include <linux/spinlock.h> |
| 20 | #include <linux/interrupt.h> |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 21 | #include <linux/debug_locks.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/module.h> |
| 23 | |
| 24 | /* |
| 25 | * Generic declaration of the raw read_trylock() function, |
| 26 | * architectures are supposed to optimize this: |
| 27 | */ |
Ingo Molnar | fb1c8f9 | 2005-09-10 00:25:56 -0700 | [diff] [blame] | 28 | int __lockfunc generic__raw_read_trylock(raw_rwlock_t *lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | { |
Ingo Molnar | fb1c8f9 | 2005-09-10 00:25:56 -0700 | [diff] [blame] | 30 | __raw_read_lock(lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | return 1; |
| 32 | } |
Ingo Molnar | fb1c8f9 | 2005-09-10 00:25:56 -0700 | [diff] [blame] | 33 | EXPORT_SYMBOL(generic__raw_read_trylock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
| 35 | int __lockfunc _spin_trylock(spinlock_t *lock) |
| 36 | { |
| 37 | preempt_disable(); |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 38 | if (_raw_spin_trylock(lock)) { |
| 39 | spin_acquire(&lock->dep_map, 0, 1, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | return 1; |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 41 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
| 43 | preempt_enable(); |
| 44 | return 0; |
| 45 | } |
| 46 | EXPORT_SYMBOL(_spin_trylock); |
| 47 | |
| 48 | int __lockfunc _read_trylock(rwlock_t *lock) |
| 49 | { |
| 50 | preempt_disable(); |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 51 | if (_raw_read_trylock(lock)) { |
| 52 | rwlock_acquire_read(&lock->dep_map, 0, 1, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | return 1; |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 54 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
| 56 | preempt_enable(); |
| 57 | return 0; |
| 58 | } |
| 59 | EXPORT_SYMBOL(_read_trylock); |
| 60 | |
| 61 | int __lockfunc _write_trylock(rwlock_t *lock) |
| 62 | { |
| 63 | preempt_disable(); |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 64 | if (_raw_write_trylock(lock)) { |
| 65 | rwlock_acquire(&lock->dep_map, 0, 1, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | return 1; |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 67 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
| 69 | preempt_enable(); |
| 70 | return 0; |
| 71 | } |
| 72 | EXPORT_SYMBOL(_write_trylock); |
| 73 | |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 74 | /* |
| 75 | * If lockdep is enabled then we use the non-preemption spin-ops |
| 76 | * even on CONFIG_PREEMPT, because lockdep assumes that interrupts are |
| 77 | * not re-enabled during lock-acquire (which the preempt-spin-ops do): |
| 78 | */ |
| 79 | #if !defined(CONFIG_PREEMPT) || !defined(CONFIG_SMP) || \ |
Jarek Poplawski | fc47e7b | 2006-09-06 00:03:39 -0700 | [diff] [blame] | 80 | defined(CONFIG_DEBUG_LOCK_ALLOC) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
| 82 | void __lockfunc _read_lock(rwlock_t *lock) |
| 83 | { |
| 84 | preempt_disable(); |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 85 | rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | _raw_read_lock(lock); |
| 87 | } |
| 88 | EXPORT_SYMBOL(_read_lock); |
| 89 | |
| 90 | unsigned long __lockfunc _spin_lock_irqsave(spinlock_t *lock) |
| 91 | { |
| 92 | unsigned long flags; |
| 93 | |
| 94 | local_irq_save(flags); |
| 95 | preempt_disable(); |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 96 | spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); |
| 97 | /* |
| 98 | * On lockdep we dont want the hand-coded irq-enable of |
| 99 | * _raw_spin_lock_flags() code, because lockdep assumes |
| 100 | * that interrupts are not re-enabled during lock-acquire: |
| 101 | */ |
| 102 | #ifdef CONFIG_PROVE_LOCKING |
| 103 | _raw_spin_lock(lock); |
| 104 | #else |
Ingo Molnar | fb1c8f9 | 2005-09-10 00:25:56 -0700 | [diff] [blame] | 105 | _raw_spin_lock_flags(lock, &flags); |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 106 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | return flags; |
| 108 | } |
| 109 | EXPORT_SYMBOL(_spin_lock_irqsave); |
| 110 | |
| 111 | void __lockfunc _spin_lock_irq(spinlock_t *lock) |
| 112 | { |
| 113 | local_irq_disable(); |
| 114 | preempt_disable(); |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 115 | spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | _raw_spin_lock(lock); |
| 117 | } |
| 118 | EXPORT_SYMBOL(_spin_lock_irq); |
| 119 | |
| 120 | void __lockfunc _spin_lock_bh(spinlock_t *lock) |
| 121 | { |
| 122 | local_bh_disable(); |
| 123 | preempt_disable(); |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 124 | spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | _raw_spin_lock(lock); |
| 126 | } |
| 127 | EXPORT_SYMBOL(_spin_lock_bh); |
| 128 | |
| 129 | unsigned long __lockfunc _read_lock_irqsave(rwlock_t *lock) |
| 130 | { |
| 131 | unsigned long flags; |
| 132 | |
| 133 | local_irq_save(flags); |
| 134 | preempt_disable(); |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 135 | rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | _raw_read_lock(lock); |
| 137 | return flags; |
| 138 | } |
| 139 | EXPORT_SYMBOL(_read_lock_irqsave); |
| 140 | |
| 141 | void __lockfunc _read_lock_irq(rwlock_t *lock) |
| 142 | { |
| 143 | local_irq_disable(); |
| 144 | preempt_disable(); |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 145 | rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | _raw_read_lock(lock); |
| 147 | } |
| 148 | EXPORT_SYMBOL(_read_lock_irq); |
| 149 | |
| 150 | void __lockfunc _read_lock_bh(rwlock_t *lock) |
| 151 | { |
| 152 | local_bh_disable(); |
| 153 | preempt_disable(); |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 154 | rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | _raw_read_lock(lock); |
| 156 | } |
| 157 | EXPORT_SYMBOL(_read_lock_bh); |
| 158 | |
| 159 | unsigned long __lockfunc _write_lock_irqsave(rwlock_t *lock) |
| 160 | { |
| 161 | unsigned long flags; |
| 162 | |
| 163 | local_irq_save(flags); |
| 164 | preempt_disable(); |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 165 | rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | _raw_write_lock(lock); |
| 167 | return flags; |
| 168 | } |
| 169 | EXPORT_SYMBOL(_write_lock_irqsave); |
| 170 | |
| 171 | void __lockfunc _write_lock_irq(rwlock_t *lock) |
| 172 | { |
| 173 | local_irq_disable(); |
| 174 | preempt_disable(); |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 175 | rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | _raw_write_lock(lock); |
| 177 | } |
| 178 | EXPORT_SYMBOL(_write_lock_irq); |
| 179 | |
| 180 | void __lockfunc _write_lock_bh(rwlock_t *lock) |
| 181 | { |
| 182 | local_bh_disable(); |
| 183 | preempt_disable(); |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 184 | rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | _raw_write_lock(lock); |
| 186 | } |
| 187 | EXPORT_SYMBOL(_write_lock_bh); |
| 188 | |
| 189 | void __lockfunc _spin_lock(spinlock_t *lock) |
| 190 | { |
| 191 | preempt_disable(); |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 192 | spin_acquire(&lock->dep_map, 0, 0, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | _raw_spin_lock(lock); |
| 194 | } |
| 195 | |
| 196 | EXPORT_SYMBOL(_spin_lock); |
| 197 | |
| 198 | void __lockfunc _write_lock(rwlock_t *lock) |
| 199 | { |
| 200 | preempt_disable(); |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 201 | rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | _raw_write_lock(lock); |
| 203 | } |
| 204 | |
| 205 | EXPORT_SYMBOL(_write_lock); |
| 206 | |
| 207 | #else /* CONFIG_PREEMPT: */ |
| 208 | |
| 209 | /* |
| 210 | * This could be a long-held lock. We both prepare to spin for a long |
| 211 | * time (making _this_ CPU preemptable if possible), and we also signal |
| 212 | * towards that other CPU that it should break the lock ASAP. |
| 213 | * |
| 214 | * (We do this in a function because inlining it would be excessive.) |
| 215 | */ |
| 216 | |
| 217 | #define BUILD_LOCK_OPS(op, locktype) \ |
| 218 | void __lockfunc _##op##_lock(locktype##_t *lock) \ |
| 219 | { \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | for (;;) { \ |
Oleg Nesterov | ee25e96 | 2006-03-23 03:00:58 -0800 | [diff] [blame] | 221 | preempt_disable(); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | if (likely(_raw_##op##_trylock(lock))) \ |
| 223 | break; \ |
| 224 | preempt_enable(); \ |
Oleg Nesterov | ee25e96 | 2006-03-23 03:00:58 -0800 | [diff] [blame] | 225 | \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | if (!(lock)->break_lock) \ |
| 227 | (lock)->break_lock = 1; \ |
| 228 | while (!op##_can_lock(lock) && (lock)->break_lock) \ |
| 229 | cpu_relax(); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | } \ |
| 231 | (lock)->break_lock = 0; \ |
| 232 | } \ |
| 233 | \ |
| 234 | EXPORT_SYMBOL(_##op##_lock); \ |
| 235 | \ |
| 236 | unsigned long __lockfunc _##op##_lock_irqsave(locktype##_t *lock) \ |
| 237 | { \ |
| 238 | unsigned long flags; \ |
| 239 | \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | for (;;) { \ |
Oleg Nesterov | ee25e96 | 2006-03-23 03:00:58 -0800 | [diff] [blame] | 241 | preempt_disable(); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | local_irq_save(flags); \ |
| 243 | if (likely(_raw_##op##_trylock(lock))) \ |
| 244 | break; \ |
| 245 | local_irq_restore(flags); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | preempt_enable(); \ |
Oleg Nesterov | ee25e96 | 2006-03-23 03:00:58 -0800 | [diff] [blame] | 247 | \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | if (!(lock)->break_lock) \ |
| 249 | (lock)->break_lock = 1; \ |
| 250 | while (!op##_can_lock(lock) && (lock)->break_lock) \ |
| 251 | cpu_relax(); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | } \ |
| 253 | (lock)->break_lock = 0; \ |
| 254 | return flags; \ |
| 255 | } \ |
| 256 | \ |
| 257 | EXPORT_SYMBOL(_##op##_lock_irqsave); \ |
| 258 | \ |
| 259 | void __lockfunc _##op##_lock_irq(locktype##_t *lock) \ |
| 260 | { \ |
| 261 | _##op##_lock_irqsave(lock); \ |
| 262 | } \ |
| 263 | \ |
| 264 | EXPORT_SYMBOL(_##op##_lock_irq); \ |
| 265 | \ |
| 266 | void __lockfunc _##op##_lock_bh(locktype##_t *lock) \ |
| 267 | { \ |
| 268 | unsigned long flags; \ |
| 269 | \ |
| 270 | /* */ \ |
| 271 | /* Careful: we must exclude softirqs too, hence the */ \ |
| 272 | /* irq-disabling. We use the generic preemption-aware */ \ |
| 273 | /* function: */ \ |
| 274 | /**/ \ |
| 275 | flags = _##op##_lock_irqsave(lock); \ |
| 276 | local_bh_disable(); \ |
| 277 | local_irq_restore(flags); \ |
| 278 | } \ |
| 279 | \ |
| 280 | EXPORT_SYMBOL(_##op##_lock_bh) |
| 281 | |
| 282 | /* |
| 283 | * Build preemption-friendly versions of the following |
| 284 | * lock-spinning functions: |
| 285 | * |
| 286 | * _[spin|read|write]_lock() |
| 287 | * _[spin|read|write]_lock_irq() |
| 288 | * _[spin|read|write]_lock_irqsave() |
| 289 | * _[spin|read|write]_lock_bh() |
| 290 | */ |
| 291 | BUILD_LOCK_OPS(spin, spinlock); |
| 292 | BUILD_LOCK_OPS(read, rwlock); |
| 293 | BUILD_LOCK_OPS(write, rwlock); |
| 294 | |
| 295 | #endif /* CONFIG_PREEMPT */ |
| 296 | |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 297 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 298 | |
| 299 | void __lockfunc _spin_lock_nested(spinlock_t *lock, int subclass) |
| 300 | { |
| 301 | preempt_disable(); |
| 302 | spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_); |
| 303 | _raw_spin_lock(lock); |
| 304 | } |
| 305 | |
| 306 | EXPORT_SYMBOL(_spin_lock_nested); |
| 307 | |
| 308 | #endif |
| 309 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | void __lockfunc _spin_unlock(spinlock_t *lock) |
| 311 | { |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 312 | spin_release(&lock->dep_map, 1, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | _raw_spin_unlock(lock); |
| 314 | preempt_enable(); |
| 315 | } |
| 316 | EXPORT_SYMBOL(_spin_unlock); |
| 317 | |
| 318 | void __lockfunc _write_unlock(rwlock_t *lock) |
| 319 | { |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 320 | rwlock_release(&lock->dep_map, 1, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | _raw_write_unlock(lock); |
| 322 | preempt_enable(); |
| 323 | } |
| 324 | EXPORT_SYMBOL(_write_unlock); |
| 325 | |
| 326 | void __lockfunc _read_unlock(rwlock_t *lock) |
| 327 | { |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 328 | rwlock_release(&lock->dep_map, 1, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | _raw_read_unlock(lock); |
| 330 | preempt_enable(); |
| 331 | } |
| 332 | EXPORT_SYMBOL(_read_unlock); |
| 333 | |
| 334 | void __lockfunc _spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags) |
| 335 | { |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 336 | spin_release(&lock->dep_map, 1, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | _raw_spin_unlock(lock); |
| 338 | local_irq_restore(flags); |
| 339 | preempt_enable(); |
| 340 | } |
| 341 | EXPORT_SYMBOL(_spin_unlock_irqrestore); |
| 342 | |
| 343 | void __lockfunc _spin_unlock_irq(spinlock_t *lock) |
| 344 | { |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 345 | spin_release(&lock->dep_map, 1, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | _raw_spin_unlock(lock); |
| 347 | local_irq_enable(); |
| 348 | preempt_enable(); |
| 349 | } |
| 350 | EXPORT_SYMBOL(_spin_unlock_irq); |
| 351 | |
| 352 | void __lockfunc _spin_unlock_bh(spinlock_t *lock) |
| 353 | { |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 354 | spin_release(&lock->dep_map, 1, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | _raw_spin_unlock(lock); |
Samuel Thibault | 10f02d1c | 2005-05-21 17:50:15 +0200 | [diff] [blame] | 356 | preempt_enable_no_resched(); |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 357 | local_bh_enable_ip((unsigned long)__builtin_return_address(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | } |
| 359 | EXPORT_SYMBOL(_spin_unlock_bh); |
| 360 | |
| 361 | void __lockfunc _read_unlock_irqrestore(rwlock_t *lock, unsigned long flags) |
| 362 | { |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 363 | rwlock_release(&lock->dep_map, 1, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | _raw_read_unlock(lock); |
| 365 | local_irq_restore(flags); |
| 366 | preempt_enable(); |
| 367 | } |
| 368 | EXPORT_SYMBOL(_read_unlock_irqrestore); |
| 369 | |
| 370 | void __lockfunc _read_unlock_irq(rwlock_t *lock) |
| 371 | { |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 372 | rwlock_release(&lock->dep_map, 1, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | _raw_read_unlock(lock); |
| 374 | local_irq_enable(); |
| 375 | preempt_enable(); |
| 376 | } |
| 377 | EXPORT_SYMBOL(_read_unlock_irq); |
| 378 | |
| 379 | void __lockfunc _read_unlock_bh(rwlock_t *lock) |
| 380 | { |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 381 | rwlock_release(&lock->dep_map, 1, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | _raw_read_unlock(lock); |
Samuel Thibault | 10f02d1c | 2005-05-21 17:50:15 +0200 | [diff] [blame] | 383 | preempt_enable_no_resched(); |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 384 | local_bh_enable_ip((unsigned long)__builtin_return_address(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | } |
| 386 | EXPORT_SYMBOL(_read_unlock_bh); |
| 387 | |
| 388 | void __lockfunc _write_unlock_irqrestore(rwlock_t *lock, unsigned long flags) |
| 389 | { |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 390 | rwlock_release(&lock->dep_map, 1, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | _raw_write_unlock(lock); |
| 392 | local_irq_restore(flags); |
| 393 | preempt_enable(); |
| 394 | } |
| 395 | EXPORT_SYMBOL(_write_unlock_irqrestore); |
| 396 | |
| 397 | void __lockfunc _write_unlock_irq(rwlock_t *lock) |
| 398 | { |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 399 | rwlock_release(&lock->dep_map, 1, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | _raw_write_unlock(lock); |
| 401 | local_irq_enable(); |
| 402 | preempt_enable(); |
| 403 | } |
| 404 | EXPORT_SYMBOL(_write_unlock_irq); |
| 405 | |
| 406 | void __lockfunc _write_unlock_bh(rwlock_t *lock) |
| 407 | { |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 408 | rwlock_release(&lock->dep_map, 1, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | _raw_write_unlock(lock); |
Samuel Thibault | 10f02d1c | 2005-05-21 17:50:15 +0200 | [diff] [blame] | 410 | preempt_enable_no_resched(); |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 411 | local_bh_enable_ip((unsigned long)__builtin_return_address(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | } |
| 413 | EXPORT_SYMBOL(_write_unlock_bh); |
| 414 | |
| 415 | int __lockfunc _spin_trylock_bh(spinlock_t *lock) |
| 416 | { |
| 417 | local_bh_disable(); |
| 418 | preempt_disable(); |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 419 | if (_raw_spin_trylock(lock)) { |
| 420 | spin_acquire(&lock->dep_map, 0, 1, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | return 1; |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 422 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | |
Samuel Thibault | 10f02d1c | 2005-05-21 17:50:15 +0200 | [diff] [blame] | 424 | preempt_enable_no_resched(); |
Ingo Molnar | 8a25d5d | 2006-07-03 00:24:54 -0700 | [diff] [blame] | 425 | local_bh_enable_ip((unsigned long)__builtin_return_address(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | return 0; |
| 427 | } |
| 428 | EXPORT_SYMBOL(_spin_trylock_bh); |
| 429 | |
| 430 | int in_lock_functions(unsigned long addr) |
| 431 | { |
| 432 | /* Linker adds these: start and end of __lockfunc functions */ |
| 433 | extern char __lock_text_start[], __lock_text_end[]; |
| 434 | |
| 435 | return addr >= (unsigned long)__lock_text_start |
| 436 | && addr < (unsigned long)__lock_text_end; |
| 437 | } |
| 438 | EXPORT_SYMBOL(in_lock_functions); |