static void show_pte()

in mm/fault.c [37:118]

• 63 lines of code
• 16 McCabe index (conditional complexity)

static void show_pte(struct mm_struct *mm, unsigned long addr)
{
	pgd_t *pgd;

	if (mm) {
		pgd = mm->pgd;
	} else {
		pgd = get_TTB();

		if (unlikely(!pgd))
			pgd = swapper_pg_dir;
	}

	pr_alert("pgd = %p\n", pgd);
	pgd += pgd_index(addr);
	pr_alert("[%08lx] *pgd=%0*llx", addr, (u32)(sizeof(*pgd) * 2),
		 (u64)pgd_val(*pgd));

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

		if (pgd_none(*pgd))
			break;

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

		p4d = p4d_offset(pgd, addr);
		if (PTRS_PER_P4D != 1)
			pr_cont(", *p4d=%0*Lx", (u32)(sizeof(*p4d) * 2),
			        (u64)p4d_val(*p4d));

		if (p4d_none(*p4d))
			break;

		if (p4d_bad(*p4d)) {
			pr_cont("(bad)");
			break;
		}

		pud = pud_offset(p4d, addr);
		if (PTRS_PER_PUD != 1)
			pr_cont(", *pud=%0*llx", (u32)(sizeof(*pud) * 2),
				(u64)pud_val(*pud));

		if (pud_none(*pud))
			break;

		if (pud_bad(*pud)) {
			pr_cont("(bad)");
			break;
		}

		pmd = pmd_offset(pud, addr);
		if (PTRS_PER_PMD != 1)
			pr_cont(", *pmd=%0*llx", (u32)(sizeof(*pmd) * 2),
				(u64)pmd_val(*pmd));

		if (pmd_none(*pmd))
			break;

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

		/* We must not map this if we have highmem enabled */
		if (PageHighMem(pfn_to_page(pmd_val(*pmd) >> PAGE_SHIFT)))
			break;

		pte = pte_offset_kernel(pmd, addr);
		pr_cont(", *pte=%0*llx", (u32)(sizeof(*pte) * 2),
			(u64)pte_val(*pte));
	} while (0);

	pr_cont("\n");
}