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  1. #ifndef __LINUX_SPINLOCK_UP_H
  2. #define __LINUX_SPINLOCK_UP_H
  3.  
  4. #ifndef __LINUX_SPINLOCK_H
  5. # error "please don't include this file directly"
  6. #endif
  7.  
  8. /*
  9.  * include/linux/spinlock_up.h - UP-debug version of spinlocks.
  10.  *
  11.  * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
  12.  * Released under the General Public License (GPL).
  13.  *
  14.  * In the debug case, 1 means unlocked, 0 means locked. (the values
  15.  * are inverted, to catch initialization bugs)
  16.  *
  17.  * No atomicity anywhere, we are on UP.
  18.  */
  19.  
  20. #ifdef CONFIG_DEBUG_SPINLOCK
  21. #define __raw_spin_is_locked(x)         ((x)->slock == 0)
  22.  
  23. static inline void __raw_spin_lock(raw_spinlock_t *lock)
  24. {
  25.         lock->slock = 0;
  26. }
  27.  
  28. static inline void
  29. __raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long flags)
  30. {
  31.         local_irq_save(flags);
  32.         lock->slock = 0;
  33. }
  34.  
  35. static inline int __raw_spin_trylock(raw_spinlock_t *lock)
  36. {
  37.         char oldval = lock->slock;
  38.  
  39.         lock->slock = 0;
  40.  
  41.         return oldval > 0;
  42. }
  43.  
  44. static inline void __raw_spin_unlock(raw_spinlock_t *lock)
  45. {
  46.         lock->slock = 1;
  47. }
  48.  
  49. /*
  50.  * Read-write spinlocks. No debug version.
  51.  */
  52. #define __raw_read_lock(lock)           do { (void)(lock); } while (0)
  53. #define __raw_write_lock(lock)          do { (void)(lock); } while (0)
  54. #define __raw_read_trylock(lock)        ({ (void)(lock); 1; })
  55. #define __raw_write_trylock(lock)       ({ (void)(lock); 1; })
  56. #define __raw_read_unlock(lock)         do { (void)(lock); } while (0)
  57. #define __raw_write_unlock(lock)        do { (void)(lock); } while (0)
  58.  
  59. #else /* DEBUG_SPINLOCK */
  60. #define __raw_spin_is_locked(lock)      ((void)(lock), 0)
  61. /* for sched.c and kernel_lock.c: */
  62. # define __raw_spin_lock(lock)          do { (void)(lock); } while (0)
  63. # define __raw_spin_lock_flags(lock, flags)     do { (void)(lock); } while (0)
  64. # define __raw_spin_unlock(lock)        do { (void)(lock); } while (0)
  65. # define __raw_spin_trylock(lock)       ({ (void)(lock); 1; })
  66. #endif /* DEBUG_SPINLOCK */
  67.  
  68. #define __raw_spin_is_contended(lock)   (((void)(lock), 0))
  69.  
  70. #define __raw_read_can_lock(lock)       (((void)(lock), 1))
  71. #define __raw_write_can_lock(lock)      (((void)(lock), 1))
  72.  
  73. #define __raw_spin_unlock_wait(lock) \
  74.                 do { cpu_relax(); } while (__raw_spin_is_locked(lock))
  75.  
  76. #endif /* __LINUX_SPINLOCK_UP_H */
  77.