LINUX_ENTRY_B_SEG_NOT_PRESENT
(((info)->seg_not_present == 0) << LINUX_ENTRY_B_SEG_NOT_PRESENT) | \
(((desc)->b >> LINUX_ENTRY_B_SEG_NOT_PRESENT) & 1)
(((info)->seg_not_present == 0) << LINUX_ENTRY_B_SEG_NOT_PRESENT) | \
(((desc)->b >> LINUX_ENTRY_B_SEG_NOT_PRESENT) & 1)