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