_p4d_pfn
next_phys = PFN_PHYS(_p4d_pfn(p4dp[p4d_index]));
base_pud = pt_ops.get_pud_virt(pfn_to_phys(_p4d_pfn(p4dp_get(p4dp))));
base_pud = pt_ops.get_pud_virt(pfn_to_phys(_p4d_pfn(p4dp_get(p4dp))));
unsigned long pfn = _p4d_pfn(p4dp_get(p4dp));