upper_first 712 kernel/user_namespace.c u32 upper_first, lower_first, upper_last, lower_last; upper_first 715 kernel/user_namespace.c upper_first = extent->first; upper_first 717 kernel/user_namespace.c upper_last = upper_first + extent->count - 1; upper_first 737 kernel/user_namespace.c (prev_upper_last >= upper_first))