462         let page = VirtPageFrame::new(region.start());  in mmap()
898             if guard.region.start >= vaddr  in find_nearest()
900                     guard.region.start < nearest.lock_irqsave().region.start  in find_nearest()
999             self.vm_holes.range_mut(..=region.start()).next_back();  in reserve_hole()
1004             if prev_hole_end > region.start() {  in reserve_hole()
1006                 *prev_hole_size = region.start().data() - prev_hole_vaddr.data();  in reserve_hole()
1025             .range_mut(..region.start())  in unreserve_hole()
1027             .filter(|(offset, size)| offset.data() + **size == region.start().data())  in unreserve_hole()
1032                 .insert(region.start(), region.size() + next_hole_size.unwrap_or(0));  in unreserve_hole()
1208         assert!(region.start().check_aligned(MMArch::PAGE_SIZE));  in extract()
1214             if unlikely(region.start() < guard.region.start() || region.end() > guard.region.end())  in extract()
1486             VirtPageFrame::new(self.region.start()),  in pages()
1667                 self.region.start + ((index - self.file_pgoff.unwrap()) << MMArch::PAGE_SHIFT);  in page_address()