It is unnecessary to implement a series of dedicated page table walking
helpers since there is already a general one walk_page_range_novma().  So
use it to simplify the code.

Link: https://lkml.kernel.org/r/20231127084645.27017-3-songmuchun@bytedance.comSigned-off-by: Muchun Song <songmuchun@bytedance.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>