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barrier.h

#ifndef __BARRIER_H
#define __BARRIER_H

#include <asm/compiler.h>

#define mb() \
__asm__ __volatile__("mb": : :"memory")

#define rmb() \
__asm__ __volatile__("mb": : :"memory")

#define wmb() \
__asm__ __volatile__("wmb": : :"memory")

#define read_barrier_depends() \
__asm__ __volatile__("mb": : :"memory")

#ifdef CONFIG_SMP
#define __ASM_SMP_MB    "\tmb\n"
#define smp_mb()  mb()
#define smp_rmb() rmb()
#define smp_wmb() wmb()
#define smp_read_barrier_depends()  read_barrier_depends()
#else
#define __ASM_SMP_MB
#define smp_mb()  barrier()
#define smp_rmb() barrier()
#define smp_wmb() barrier()
#define smp_read_barrier_depends()  do { } while (0)
#endif

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

#endif            /* __BARRIER_H */

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