1. 根目录:
2. arch
3. score
4. include
5. asm
6. barrier.h

#ifndef _ASM_SCORE_BARRIER_H
#define _ASM_SCORE_BARRIER_H

#define mb()		barrier()
#define rmb()		barrier()
#define wmb()		barrier()
#define smp_mb()	barrier()
#define smp_rmb()	barrier()
#define smp_wmb()	barrier()

#define read_barrier_depends()		do {} while (0)
#define smp_read_barrier_depends()	do {} while (0)

#define set_mb(var, value) 		do {var = value; wmb(); } while (0)

#endif /* _ASM_SCORE_BARRIER_H */