dev_dax_size
resource_size_t dev_size = dev_dax_size(dev_dax);
size = dev_dax_size(dev_dax);
if (victim->driver || dev_dax_size(dev_dax))
size = dev_dax_size(dev_dax);
resource_size_t to_shrink = dev_dax_size(dev_dax) - size;