pin_pagetable_pfn
pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(pa));
pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn);
pin_pagetable_pfn(MMUEXT_PIN_L4_TABLE,
pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE,
pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE,
pin_pagetable_pfn(MMUEXT_PIN_L2_TABLE,
pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE, PFN_DOWN(pud_phys));