HMM_PFN_INOUT_FLAGS
hmm_pfns[i] &= HMM_PFN_INOUT_FLAGS;
*hmm_pfn = (*hmm_pfn & HMM_PFN_INOUT_FLAGS) | new_pfn_flags;
hmm_pfns[i] &= HMM_PFN_INOUT_FLAGS;
hmm_pfns[i] &= HMM_PFN_INOUT_FLAGS;
range->hmm_pfns[i] &= HMM_PFN_INOUT_FLAGS;
range->hmm_pfns[i] &= HMM_PFN_INOUT_FLAGS;