include/linux/rwlock_api_smp.h

   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 don't 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
  18 void __lockfunc _read_lock(rwlock_t *lock)              __acquires(lock);
  19 void __lockfunc _write_lock(rwlock_t *lock)             __acquires(lock);
  20 void __lockfunc _read_lock_bh(rwlock_t *lock)           __acquires(lock);
  21 void __lockfunc _write_lock_bh(rwlock_t *lock)          __acquires(lock);
  22 void __lockfunc _read_lock_irq(rwlock_t *lock)          __acquires(lock);
  23 void __lockfunc _write_lock_irq(rwlock_t *lock)         __acquires(lock);
  24 unsigned long __lockfunc _read_lock_irqsave(rwlock_t *lock)
  25                                                         __acquires(lock);
  26 unsigned long __lockfunc _write_lock_irqsave(rwlock_t *lock)
  27                                                         __acquires(lock);
  28 int __lockfunc _read_trylock(rwlock_t *lock);
  29 int __lockfunc _write_trylock(rwlock_t *lock);
  30 void __lockfunc _read_unlock(rwlock_t *lock)            __releases(lock);
  31 void __lockfunc _write_unlock(rwlock_t *lock)           __releases(lock);
  32 void __lockfunc _read_unlock_bh(rwlock_t *lock)         __releases(lock);
  33 void __lockfunc _write_unlock_bh(rwlock_t *lock)        __releases(lock);
  34 void __lockfunc _read_unlock_irq(rwlock_t *lock)        __releases(lock);
  35 void __lockfunc _write_unlock_irq(rwlock_t *lock)       __releases(lock);
  36 void __lockfunc _read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
  37                                                         __releases(lock);
  38 void __lockfunc _write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
  39                                                         __releases(lock);
  40
  41 #ifdef CONFIG_INLINE_READ_LOCK
  42 #define _read_lock(lock) __read_lock(lock)
  43 #endif
  44
  45 #ifdef CONFIG_INLINE_WRITE_LOCK
  46 #define _write_lock(lock) __write_lock(lock)
  47 #endif
  48
  49 #ifdef CONFIG_INLINE_READ_LOCK_BH
  50 #define _read_lock_bh(lock) __read_lock_bh(lock)
  51 #endif
  52
  53 #ifdef CONFIG_INLINE_WRITE_LOCK_BH
  54 #define _write_lock_bh(lock) __write_lock_bh(lock)
  55 #endif
  56
  57 #ifdef CONFIG_INLINE_READ_LOCK_IRQ
  58 #define _read_lock_irq(lock) __read_lock_irq(lock)
  59 #endif
  60
  61 #ifdef CONFIG_INLINE_WRITE_LOCK_IRQ
  62 #define _write_lock_irq(lock) __write_lock_irq(lock)
  63 #endif
  64
  65 #ifdef CONFIG_INLINE_READ_LOCK_IRQSAVE
  66 #define _read_lock_irqsave(lock) __read_lock_irqsave(lock)
  67 #endif
  68
  69 #ifdef CONFIG_INLINE_WRITE_LOCK_IRQSAVE
  70 #define _write_lock_irqsave(lock) __write_lock_irqsave(lock)
  71 #endif
  72
  73 #ifdef CONFIG_INLINE_READ_TRYLOCK
  74 #define _read_trylock(lock) __read_trylock(lock)
  75 #endif
  76
  77 #ifdef CONFIG_INLINE_WRITE_TRYLOCK
  78 #define _write_trylock(lock) __write_trylock(lock)
  79 #endif
  80
  81 #ifdef CONFIG_INLINE_READ_UNLOCK
  82 #define _read_unlock(lock) __read_unlock(lock)
  83 #endif
  84
  85 #ifdef CONFIG_INLINE_WRITE_UNLOCK
  86 #define _write_unlock(lock) __write_unlock(lock)
  87 #endif
  88
  89 #ifdef CONFIG_INLINE_READ_UNLOCK_BH
  90 #define _read_unlock_bh(lock) __read_unlock_bh(lock)
  91 #endif
  92
  93 #ifdef CONFIG_INLINE_WRITE_UNLOCK_BH
  94 #define _write_unlock_bh(lock) __write_unlock_bh(lock)
  95 #endif
  96
  97 #ifdef CONFIG_INLINE_READ_UNLOCK_IRQ
  98 #define _read_unlock_irq(lock) __read_unlock_irq(lock)
  99 #endif
 100
 101 #ifdef CONFIG_INLINE_WRITE_UNLOCK_IRQ
 102 #define _write_unlock_irq(lock) __write_unlock_irq(lock)
 103 #endif
 104
 105 #ifdef CONFIG_INLINE_READ_UNLOCK_IRQRESTORE
 106 #define _read_unlock_irqrestore(lock, flags) __read_unlock_irqrestore(lock, flags)
 107 #endif
 108
 109 #ifdef CONFIG_INLINE_WRITE_UNLOCK_IRQRESTORE
 110 #define _write_unlock_irqrestore(lock, flags) __write_unlock_irqrestore(lock, flags)
 111 #endif
 112
 113 static inline int __read_trylock(rwlock_t *lock)
 114 {
 115         preempt_disable();
 116         if (_raw_read_trylock(lock)) {
 117                 rwlock_acquire_read(&lock->dep_map, 0, 1, _RET_IP_);
 118                 return 1;
 119         }
 120         preempt_enable();
 121         return 0;
 122 }
 123
 124 static inline int __write_trylock(rwlock_t *lock)
 125 {
 126         preempt_disable();
 127         if (_raw_write_trylock(lock)) {
 128                 rwlock_acquire(&lock->dep_map, 0, 1, _RET_IP_);
 129                 return 1;
 130         }
 131         preempt_enable();
 132         return 0;
 133 }
 134
 135 /*
 136  * If lockdep is enabled then we use the non-preemption spin-ops
 137  * even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
 138  * not re-enabled during lock-acquire (which the preempt-spin-ops do):
 139  */
 140 #if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)
 141
 142 static inline void __read_lock(rwlock_t *lock)
 143 {
 144         preempt_disable();
 145         rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
 146         LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock);
 147 }
 148
 149 static inline unsigned long __read_lock_irqsave(rwlock_t *lock)
 150 {
 151         unsigned long flags;
 152
 153         local_irq_save(flags);
 154         preempt_disable();
 155         rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
 156         LOCK_CONTENDED_FLAGS(lock, _raw_read_trylock, _raw_read_lock,
 157                              _raw_read_lock_flags, &flags);
 158         return flags;
 159 }
 160
 161 static inline void __read_lock_irq(rwlock_t *lock)
 162 {
 163         local_irq_disable();
 164         preempt_disable();
 165         rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
 166         LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock);
 167 }
 168
 169 static inline void __read_lock_bh(rwlock_t *lock)
 170 {
 171         local_bh_disable();
 172         preempt_disable();
 173         rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
 174         LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock);
 175 }
 176
 177 static inline unsigned long __write_lock_irqsave(rwlock_t *lock)
 178 {
 179         unsigned long flags;
 180
 181         local_irq_save(flags);
 182         preempt_disable();
 183         rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
 184         LOCK_CONTENDED_FLAGS(lock, _raw_write_trylock, _raw_write_lock,
 185                              _raw_write_lock_flags, &flags);
 186         return flags;
 187 }
 188
 189 static inline void __write_lock_irq(rwlock_t *lock)
 190 {
 191         local_irq_disable();
 192         preempt_disable();
 193         rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
 194         LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock);
 195 }
 196
 197 static inline void __write_lock_bh(rwlock_t *lock)
 198 {
 199         local_bh_disable();
 200         preempt_disable();
 201         rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
 202         LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock);
 203 }
 204
 205 static inline void __write_lock(rwlock_t *lock)
 206 {
 207         preempt_disable();
 208         rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
 209         LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock);
 210 }
 211
 212 #endif /* CONFIG_PREEMPT */
 213
 214 static inline void __write_unlock(rwlock_t *lock)
 215 {
 216         rwlock_release(&lock->dep_map, 1, _RET_IP_);
 217         _raw_write_unlock(lock);
 218         preempt_enable();
 219 }
 220
 221 static inline void __read_unlock(rwlock_t *lock)
 222 {
 223         rwlock_release(&lock->dep_map, 1, _RET_IP_);
 224         _raw_read_unlock(lock);
 225         preempt_enable();
 226 }
 227
 228 static inline void __read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
 229 {
 230         rwlock_release(&lock->dep_map, 1, _RET_IP_);
 231         _raw_read_unlock(lock);
 232         local_irq_restore(flags);
 233         preempt_enable();
 234 }
 235
 236 static inline void __read_unlock_irq(rwlock_t *lock)
 237 {
 238         rwlock_release(&lock->dep_map, 1, _RET_IP_);
 239         _raw_read_unlock(lock);
 240         local_irq_enable();
 241         preempt_enable();
 242 }
 243
 244 static inline void __read_unlock_bh(rwlock_t *lock)
 245 {
 246         rwlock_release(&lock->dep_map, 1, _RET_IP_);
 247         _raw_read_unlock(lock);
 248         preempt_enable_no_resched();
 249         local_bh_enable_ip((unsigned long)__builtin_return_address(0));
 250 }
 251
 252 static inline void __write_unlock_irqrestore(rwlock_t *lock,
 253                                              unsigned long flags)
 254 {
 255         rwlock_release(&lock->dep_map, 1, _RET_IP_);
 256         _raw_write_unlock(lock);
 257         local_irq_restore(flags);
 258         preempt_enable();
 259 }
 260
 261 static inline void __write_unlock_irq(rwlock_t *lock)
 262 {
 263         rwlock_release(&lock->dep_map, 1, _RET_IP_);
 264         _raw_write_unlock(lock);
 265         local_irq_enable();
 266         preempt_enable();
 267 }
 268
 269 static inline void __write_unlock_bh(rwlock_t *lock)
 270 {
 271         rwlock_release(&lock->dep_map, 1, _RET_IP_);
 272         _raw_write_unlock(lock);
 273         preempt_enable_no_resched();
 274         local_bh_enable_ip((unsigned long)__builtin_return_address(0));
 275 }
 276
 277 #endif /* __LINUX_RWLOCK_API_SMP_H */