#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
    error=io_remap_page_range(
            vma->vm_start, base+(vma->vm_pgoff<<PAGE_SHIFT),
    	    vma->vm_end-vma->vm_start, vma->vm_page_prot);
#elif LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,12)
    error=io_remap_page_range(
            vma,
            vma->vm_start, base+(vma->vm_pgoff<<PAGE_SHIFT),
    	    vma->vm_end-vma->vm_start, vma->vm_page_prot);
#else
    error=io_remap_pfn_range(
            vma,
            vma->vm_start, (base+(vma->vm_pgoff<<PAGE_SHIFT)) >> PAGE_SHIFT,
    	    vma->vm_end-vma->vm_start, vma->vm_page_prot);
#endif
    if (error)
        return error;