The two options are separate, and some platforms (e.g. arm pxa) have ISA slots but no ISA dma controller, so they cannot build drivers using the DMA API functions. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>