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kernel add
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#ifndef _ASM_SCORE_SEGMENT_H
#define _ASM_SCORE_SEGMENT_H
#ifndef __ASSEMBLY__
typedef struct {
unsigned long seg;
} mm_segment_t;
#define KERNEL_DS ((mm_segment_t){0})
#define USER_DS KERNEL_DS
# define get_ds() (KERNEL_DS)
# define get_fs() (current_thread_info()->addr_limit)
# define set_fs(x) \
do { current_thread_info()->addr_limit = (x); } while (0)
# define segment_eq(a, b) ((a).seg == (b).seg)
# endif /* __ASSEMBLY__ */
#endif /* _ASM_SCORE_SEGMENT_H */
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