Use more generic functions to deal with issues related to online nodes. 
The changes will make the code simplified.

Link: https://lkml.kernel.org/r/20220429030218.644635-1-liupeng256@huawei.comSigned-off-by: NPeng Liu <liupeng256@huawei.com>
Suggested-by: NDavidlohr Bueso <dave@stgolabs.net>
Suggested-by: NAndrew Morton <akpm@linux-foundation.org>
Reviewed-by: NMuchun Song <songmuchun@bytedance.com>
Reviewed-by: NDavid Hildenbrand <david@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>