好吧，它看起来可能像这样（在虚拟地址后跟随PTE）：
void follow_pte(struct mm_struct * mm, unsigned long address, pte_t * entry){ pgd_t * pgd = pgd_offset(mm, address); printk("follow_pte() for %lxn", address); entry->pte = 0; if (!pgd_none(*pgd) && !pgd_bad(*pgd)) { pud_t * pud = pud_offset(pgd, address); struct vm_area_struct * vma = find_vma(mm, address); printk(" pgd = %lxn", pgd_val(*pgd)); if (pud_none(*pud)) { printk(" pud = emptyn"); return; } if (pud_huge(*pud) && vma->vm_flags & VM_HUGETLB) { entry->pte = pud_val(*pud); printk(" pud = hugen"); return; } if (!pud_bad(*pud)) { pmd_t * pmd = pmd_offset(pud, address); printk(" pud = %lxn", pud_val(*pud)); if (pmd_none(*pmd)) { printk(" pmd = emptyn"); return; } if (pmd_huge(*pmd) && vma->vm_flags & VM_HUGETLB) { entry->pte = pmd_val(*pmd); printk(" pmd = hugen"); return; } if (pmd_trans_huge(*pmd)) { entry->pte = pmd_val(*pmd); printk(" pmd = trans_hugen"); return; } if (!pmd_bad(*pmd)) { pte_t * pte = pte_offset_map(pmd, address); printk(" pmd = %lxn", pmd_val(*pmd)); if (!pte_none(*pte)) { entry->pte = pte_val(*pte); printk(" pte = %lxn", pte_val(*pte)); } else { printk(" pte = emptyn"); } pte_unmap(pte); } } }}
