MAKE_MM_SEG        27 arch/x86/include/asm/uaccess.h #define KERNEL_DS	MAKE_MM_SEG(-1UL)
MAKE_MM_SEG        28 arch/x86/include/asm/uaccess.h #define USER_DS 	MAKE_MM_SEG(TASK_SIZE_MAX)
MAKE_MM_SEG        17 include/asm-generic/uaccess.h #define KERNEL_DS	MAKE_MM_SEG(~0UL)
MAKE_MM_SEG        21 include/asm-generic/uaccess.h #define USER_DS		MAKE_MM_SEG(TASK_SIZE - 1)