pte_t va_present()

in mm/proc.c [31:57]

• 25 lines of code
• 6 McCabe index (conditional complexity)

pte_t va_present(struct mm_struct * mm, unsigned long addr)
{
	pgd_t *pgd;
	p4d_t *p4d;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *ptep, pte;

	pgd = pgd_offset(mm, addr);
	if (!pgd_none(*pgd)) {
		p4d = p4d_offset(pgd, addr);
		if (!p4d_none(*p4d)) {
			pud = pud_offset(p4d, addr);
			if (!pud_none(*pud)) {
				pmd = pmd_offset(pud, addr);
				if (!pmd_none(*pmd)) {
					ptep = pte_offset_map(pmd, addr);
					pte = *ptep;
					if (pte_present(pte))
						return pte;
				}
			}
		}
	}
	return 0;

}