pgd_t *pgd = pgd_alloc_one_fast(mm);  if (unlikely(pgd == NULL)) { pgd = (pgd_t *)__get_free_page(GFP_KERNEL|__GFP_ZERO); } return pgd;
return pgtable_quicklist_alloc();
pgd_alloc (struct mm_struct *mm){	/* the VM system never calls pgd_alloc_one_fast(), so we do it here. */	pgd_t *pgd = pgd_alloc_one_fast(mm);	if (unlikely(pgd == NULL)) {		pgd = (pgd_t *)__get_free_page(GFP_KERNEL|__GFP_ZERO);	}	return pgd;}