hmm_pte_need_fault
required_fault |= hmm_pte_need_fault(hmm_vma_walk, hmm_pfns[i],
hmm_pte_need_fault(hmm_vma_walk, pfn_req_flags, 0);
hmm_pte_need_fault(hmm_vma_walk, pfn_req_flags, 0);
hmm_pte_need_fault(hmm_vma_walk, pfn_req_flags, cpu_flags);
if (hmm_pte_need_fault(hmm_vma_walk, pfn_req_flags, 0)) {
hmm_pte_need_fault(hmm_vma_walk, pfn_req_flags, cpu_flags);