device.h: dma_mem is only needed for HAVE_GENERIC_DMA_COHERENT

No need to carry an unused field around.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/linux/device.h b/include/linux/device.h
index 6cb4640..be54440 100644 (file)
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -1017,8 +1017,10 @@ struct device {
 
        struct list_head        dma_pools;      /* dma pools (if dma'ble) */
 
+#ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
        struct dma_coherent_mem *dma_mem; /* internal for coherent mem
                                             override */
+#endif
 #ifdef CONFIG_DMA_CMA
        struct cma *cma_area;           /* contiguous memory area for dma
                                           allocations */