root/arch/microblaze/include/asm/atomic.h

INCLUDED FROM

DEFINITIONS

1. atomic_dec_if_positive

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_MICROBLAZE_ATOMIC_H
   3 #define _ASM_MICROBLAZE_ATOMIC_H
   4 
   5 #include <asm/cmpxchg.h>
   6 #include <asm-generic/atomic.h>
   7 #include <asm-generic/atomic64.h>
   8 
   9 /*
  10  * Atomically test *v and decrement if it is greater than 0.
  11  * The function returns the old value of *v minus 1.
  12  */
  13 static inline int atomic_dec_if_positive(atomic_t *v)
  14 {
  15         unsigned long flags;
  16         int res;
  17 
  18         local_irq_save(flags);
  19         res = v->counter - 1;
  20         if (res >= 0)
  21                 v->counter = res;
  22         local_irq_restore(flags);
  23 
  24         return res;
  25 }
  26 #define atomic_dec_if_positive atomic_dec_if_positive
  27 
  28 #endif /* _ASM_MICROBLAZE_ATOMIC_H */