void show_pte()

in mm/fault.c [22:71]

• 40 lines of code
• 8 McCabe index (conditional complexity)

void show_pte(struct mm_struct *mm, unsigned long addr)
{
	pgd_t *pgd;
	if (!mm)
		mm = &init_mm;

	pr_alert("pgd = %p\n", mm->pgd);
	pgd = pgd_offset(mm, addr);
	pr_alert("[%08lx] *pgd=%08lx", addr, pgd_val(*pgd));

	do {
		p4d_t *p4d;
		pud_t *pud;
		pmd_t *pmd;

		if (pgd_none(*pgd))
			break;

		if (pgd_bad(*pgd)) {
			pr_alert("(bad)");
			break;
		}

		p4d = p4d_offset(pgd, addr);
		pud = pud_offset(p4d, addr);
		pmd = pmd_offset(pud, addr);
#if PTRS_PER_PMD != 1
		pr_alert(", *pmd=%08lx", pmd_val(*pmd));
#endif

		if (pmd_none(*pmd))
			break;

		if (pmd_bad(*pmd)) {
			pr_alert("(bad)");
			break;
		}

		if (IS_ENABLED(CONFIG_HIGHMEM))
		{
			pte_t *pte;
			/* We must not map this if we have highmem enabled */
			pte = pte_offset_map(pmd, addr);
			pr_alert(", *pte=%08lx", pte_val(*pte));
			pte_unmap(pte);
		}
	} while (0);

	pr_alert("\n");
}