19     verify_area, MsFlags, VirtAddr, VmFlags,
253     pub fn brk(new_addr: VirtAddr) -> Result<VirtAddr, SystemError> {  in brk()  argument
267                 .set_brk(VirtAddr::new(page_align_up(new_addr.data())))  in brk()
274     pub fn sbrk(incr: isize) -> Result<VirtAddr, SystemError> {  in sbrk()  argument
300         start_vaddr: VirtAddr,  in mmap()  argument
310         if start_vaddr < VirtAddr::new(DEFAULT_MMAP_MIN_ADDR)  in mmap()
368         old_vaddr: VirtAddr,  in mremap()  argument
372         new_vaddr: VirtAddr,  in mremap()  argument
377                 || new_vaddr == VirtAddr::new(0))  in mremap()
450     pub fn munmap(start_vaddr: VirtAddr, len: usize) -> Result<usize, SystemError> {  in munmap()  argument
481         start_vaddr: VirtAddr,  in mprotect()  argument
516         start_vaddr: VirtAddr,  in madvise()  argument
551     pub fn msync(start: VirtAddr, len: usize, flags: usize) -> Result<usize, SystemError> {  in msync()  argument
589             .find_nearest(VirtAddr::new(start));  in msync()
636                             .find_nearest(VirtAddr::new(start));  in msync()
646                         .find_nearest(VirtAddr::new(vm_end));  in msync()