arch/microblaze/include/asm/atomic.h

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