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virtio: mark vring_dma_dev() static
We get 1 warning when building kernel with W=1: drivers/virtio/virtio_ring.c:170:16: warning: no previous prototype for 'vring_dma_dev' [-Wmissing-prototypes] In fact, this function is only used in the file in which it is declared and don't need a declaration, but can be made static. so this patch marks this function with 'static'. Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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@ -167,7 +167,7 @@ static bool vring_use_dma_api(struct virtio_device *vdev)
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* making all of the arch DMA ops work on the vring device itself
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* is a mess. For now, we use the parent device for DMA ops.
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*/
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struct device *vring_dma_dev(const struct vring_virtqueue *vq)
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static struct device *vring_dma_dev(const struct vring_virtqueue *vq)
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{
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return vq->vq.vdev->dev.parent;
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}
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