swab.h
#ifndef _ASM_GENERIC_SWAB_H
#define _ASM_GENERIC_SWAB_H
#include <asm/bitsperlong.h>
/*
* 32 bit architectures typically (but not always) want to
* set __SWAB_64_THRU_32__. In user space, this is only
* valid if the compiler supports 64 bit data types.
*/
#if __BITS_PER_LONG == 32
#if defined(__GNUC__) && !defined(__STRICT_ANSI__) || defined(__KERNEL__)
#define __SWAB_64_THRU_32__
#endif
#endif
#endif /* _ASM_GENERIC_SWAB_H */