arch/microblaze/include/asm/atomic.h

   1 #ifndef _ASM_MICROBLAZE_ATOMIC_H
   2 #define _ASM_MICROBLAZE_ATOMIC_H
   3
   4 #include <asm-generic/atomic.h>
   5 #include <asm-generic/atomic64.h>
   6
   7 /*
   8  * Atomically test *v and decrement if it is greater than 0.
   9  * The function returns the old value of *v minus 1.
  10  */
  11 static inline int atomic_dec_if_positive(atomic_t *v)
  12 {
  13         unsigned long flags;
  14         int res;
  15
  16         local_irq_save(flags);
  17         res = v->counter - 1;
  18         if (res >= 0)
  19                 v->counter = res;
  20         local_irq_restore(flags);
  21
  22         return res;
  23 }
  24
  25 #endif /* _ASM_MICROBLAZE_ATOMIC_H */