Source of ioremap.c - linux-imx - PHYTEC BitBucket (Stash)

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​
        if (ioremap_try_huge_pud(pud, addr, next, phys_addr, prot))
            continue;
​
        if (ioremap_pmd_range(pud, addr, next, phys_addr, prot))
            return -ENOMEM;
    } while (pud++, phys_addr += (next - addr), addr = next, addr != end);
    return 0;
}
​
static int ioremap_try_huge_p4d(p4d_t *p4d, unsigned long addr,
                unsigned long end, phys_addr_t phys_addr,
                pgprot_t prot)
{
    if (!ioremap_p4d_enabled())
        return 0;
​
    if ((end - addr) != P4D_SIZE)
        return 0;
​
    if (!IS_ALIGNED(phys_addr, P4D_SIZE))
        return 0;
​
    if (p4d_present(*p4d) && !p4d_free_pud_page(p4d, addr))
        return 0;
​
    return p4d_set_huge(p4d, phys_addr, prot);
}
​
static inline int ioremap_p4d_range(pgd_t *pgd, unsigned long addr,
        unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
{
    p4d_t *p4d;
    unsigned long next;
​
    p4d = p4d_alloc(&init_mm, pgd, addr);
    if (!p4d)
        return -ENOMEM;
    do {
        next = p4d_addr_end(addr, end);
​
        if (ioremap_p4d_enabled() &&
            ((next - addr) == P4D_SIZE) &&
            IS_ALIGNED(phys_addr, P4D_SIZE)) {
            if (p4d_set_huge(p4d, phys_addr, prot))
                continue;
        }
        if (ioremap_try_huge_p4d(p4d, addr, next, phys_addr, prot))
            continue;
​
        if (ioremap_pud_range(p4d, addr, next, phys_addr, prot))
            return -ENOMEM;
    } while (p4d++, phys_addr += (next - addr), addr = next, addr != end);
    return 0;
}
​
int ioremap_page_range(unsigned long addr,
               unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
{