static void *ion_dma_buf_kmap(struct dma_buf *dmabuf, unsigned long offset)
{
	struct ion_buffer *buffer = dmabuf->priv;

	return buffer->vaddr + offset * PAGE_SIZE;
}
static void *ion_dma_buf_kmap(struct dma_buf *dmabuf, unsigned long offset)
{
	struct ion_buffer *buffer = dmabuf->priv;

	return buffer->vaddr + offset * PAGE_SIZE;
}