static unsigned get_pte_for_vaddr()

in mm/tlb.c [167:195]

• 28 lines of code
• 7 McCabe index (conditional complexity)

static unsigned get_pte_for_vaddr(unsigned vaddr)
{
	struct task_struct *task = get_current();
	struct mm_struct *mm = task->mm;
	pgd_t *pgd;
	p4d_t *p4d;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte;

	if (!mm)
		mm = task->active_mm;
	pgd = pgd_offset(mm, vaddr);
	if (pgd_none_or_clear_bad(pgd))
		return 0;
	p4d = p4d_offset(pgd, vaddr);
	if (p4d_none_or_clear_bad(p4d))
		return 0;
	pud = pud_offset(p4d, vaddr);
	if (pud_none_or_clear_bad(pud))
		return 0;
	pmd = pmd_offset(pud, vaddr);
	if (pmd_none_or_clear_bad(pmd))
		return 0;
	pte = pte_offset_map(pmd, vaddr);
	if (!pte)
		return 0;
	return pte_val(*pte);
}