git.sesse.net Git - bcachefs-tools-debian/blob - include/linux/spinlock.h

   1 #ifndef __TOOLS_LINUX_SPINLOCK_H
   2 #define __TOOLS_LINUX_SPINLOCK_H
   3
   4 #include <linux/atomic.h>
   5
   6 typedef struct {
   7         int             count;
   8 } raw_spinlock_t;
   9
  10 #define __RAW_SPIN_LOCK_UNLOCKED(name)  (raw_spinlock_t) { .count = 0 }
  11
  12 static inline void raw_spin_lock_init(raw_spinlock_t *lock)
  13 {
  14         smp_store_release(&lock->count, 0);
  15 }
  16
  17 static inline void raw_spin_lock(raw_spinlock_t *lock)
  18 {
  19         while (xchg_acquire(&lock->count, 1))
  20                 ;
  21 }
  22
  23 static inline void raw_spin_unlock(raw_spinlock_t *lock)
  24 {
  25         smp_store_release(&lock->count, 0);
  26 }
  27
  28 #define raw_spin_lock_irq(lock)         raw_spin_lock(lock)
  29 #define raw_spin_unlock_irq(lock)       raw_spin_unlock(lock)
  30
  31 #define raw_spin_lock_irqsave(lock, flags)              \
  32 do {                                                    \
  33         flags = 0;                                      \
  34         raw_spin_lock(lock);                            \
  35 } while (0)
  36
  37 #define raw_spin_unlock_irqrestore(lock, flags) raw_spin_unlock(lock)
  38
  39 typedef raw_spinlock_t spinlock_t;
  40
  41 #define __SPIN_LOCK_UNLOCKED(name)      __RAW_SPIN_LOCK_UNLOCKED(name)
  42
  43 #define DEFINE_SPINLOCK(x)      spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
  44
  45 #define spin_lock_init(lock)            raw_spin_lock_init(lock)
  46 #define spin_lock(lock)                 raw_spin_lock(lock)
  47 #define spin_unlock(lock)               raw_spin_unlock(lock)
  48
  49 #define spin_lock_nested(lock, n)       spin_lock(lock)
  50
  51 #define spin_lock_bh(lock)              raw_spin_lock(lock)
  52 #define spin_unlock_bh(lock)            raw_spin_unlock(lock)
  53
  54 #define spin_lock_irq(lock)             raw_spin_lock(lock)
  55 #define spin_unlock_irq(lock)           raw_spin_unlock(lock)
  56
  57 #define spin_lock_irqsave(lock, flags)  raw_spin_lock_irqsave(lock, flags)
  58 #define spin_unlock_irqrestore(lock, flags) raw_spin_unlock_irqrestore(lock, flags)
  59
  60 #endif /* __TOOLS_LINUX_SPINLOCK_H */