#elif (LINUX_VERSION_CODE <= KERNEL_VERSION(4, 19, 0))
static int kbase_cpu_vm_fault(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
#else
static vm_fault_t kbase_cpu_vm_fault(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;