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kernel add
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#ifndef __ASM_GENERIC_UNALIGNED_H
#define __ASM_GENERIC_UNALIGNED_H
/*
* This is the most generic implementation of unaligned accesses
* and should work almost anywhere.
*/
#include <asm/byteorder.h>
/* Set by the arch if it can handle unaligned accesses in hardware. */
#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
# include <linux/unaligned/access_ok.h>
#endif
#if defined(__LITTLE_ENDIAN)
# ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
# include <linux/unaligned/le_struct.h>
# include <linux/unaligned/be_byteshift.h>
# endif
# include <linux/unaligned/generic.h>
# define get_unaligned __get_unaligned_le
# define put_unaligned __put_unaligned_le
#elif defined(__BIG_ENDIAN)
# ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
# include <linux/unaligned/be_struct.h>
# include <linux/unaligned/le_byteshift.h>
# endif
# include <linux/unaligned/generic.h>
# define get_unaligned __get_unaligned_be
# define put_unaligned __put_unaligned_be
#else
# error need to define endianess
#endif
#endif /* __ASM_GENERIC_UNALIGNED_H */
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