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When draining a page_frag_cache, most user are doing the similar steps, so introduce an API to avoid code duplication. Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com> Acked-by: Jason Wang <jasowang@redhat.com> Reviewed-by: Alexander Duyck <alexanderduyck@fb.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>