oldsz             221 vm.c           allocuvm(pde_t *pgdir, uint oldsz, uint newsz)
oldsz             228 vm.c             if(newsz < oldsz)
oldsz             229 vm.c               return oldsz;
oldsz             231 vm.c             a = PGROUNDUP(oldsz);
oldsz             236 vm.c                 deallocuvm(pgdir, newsz, oldsz);
oldsz             250 vm.c           deallocuvm(pde_t *pgdir, uint oldsz, uint newsz)
oldsz             255 vm.c             if(newsz >= oldsz)
oldsz             256 vm.c               return oldsz;
oldsz             259 vm.c             for(; a  < oldsz; a += PGSIZE){