DMA_HEAP_IOC_MAGIC
#define DMA_HEAP_IOCTL_ALLOC _IOWR(DMA_HEAP_IOC_MAGIC, 0x0,\
older_alloc_ioctl = _IOWR(DMA_HEAP_IOC_MAGIC, 0x0,
newer_alloc_ioctl = _IOWR(DMA_HEAP_IOC_MAGIC, 0x0,