Why I don't have pages that do not contain pages when swap is disabled

I go through the vm_area_struct scopes of the task and try to get the corresponding page of the page (page) structure, but some pages are missing from RAM: pte_present (* pte) returns 0. I can't figure out this behavior because I have no swap space, so I suppose that all user-space virtual space is mapped to the rendered pages in RAM. Can anyone explain this to me?

static struct page * get_page(unsigned long addr)
{
    pgd_t *pgd;
    pte_t *pte;
    pud_t *pud;
    pmd_t *pmd;
    struct page *pg;
    struct mm_struct *mm = current->mm;

    pgd = pgd_offset(mm, addr);
    if (pgd_none_or_clear_bad(pgd)) {
            goto err;
    }

    pud = pud_offset(pgd, addr);
    if (pud_none(*pud) || pud_bad(*pud)) {
            goto err;
    }

    pmd = pmd_offset(pud, addr);
    if (pmd_none(*pmd) || pmd_bad(*pmd)) {
            goto err;
    }

    pte = pte_offset_map(pmd, addr);
    if (!pte) {
            goto err;
    }

    if (!pte_present(*pte)) {
            PR("pte is not present\n");
            goto err;
    }

    pg = pte_page(*pte);
    if (!pg) {                
            pte_unmap(pte);
            goto err;
    }

    pte_unmap(pte);