shmem_read_mapping_page
page = shmem_read_mapping_page(mapping, i);
page = shmem_read_mapping_page(vm_obj, i);
page = shmem_read_mapping_page(vm_obj, i);
struct page * shmem_read_mapping_page(vm_object_t, vm_pindex_t);
*pagep = shmem_read_mapping_page(obj, OFF_TO_IDX(pos));
return shmem_read_mapping_page(mapping, index);