samples: mbochs: add DMA_SHARED_BUFFER dependency

The new bochs vbe sample fails to link when DMA_SHARED_BUFFER is
disabled:

ERROR: "dma_buf_export" [samples/vfio-mdev/mbochs.ko] undefined!
ERROR: "dma_buf_fd" [samples/vfio-mdev/mbochs.ko] undefined!

This uses a 'select' statement to enable that framework, like all
other users do.

Fixes: a5e6e6505f38 ("sample: vfio bochs vbe display (host device for bochs-drm)")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

diff --git a/samples/Kconfig b/samples/Kconfig
index 3aeaaca778314c73e77bf384d74f8c82e7fd4628..bd133efc1a566ecff49092b9b32f13e1d9754143 100644 (file)
--- a/samples/Kconfig
+++ b/samples/Kconfig
@@ -135,6 +135,7 @@ config SAMPLE_VFIO_MDEV_MDPY_FB
 config SAMPLE_VFIO_MDEV_MBOCHS
        tristate "Build VFIO mdpy example mediated device sample code -- loadable modules only"
        depends on VFIO_MDEV_DEVICE && m
+       select DMA_SHARED_BUFFER
        help
          Build a virtual display sample driver for use as a VFIO
          mediated device.  It supports the region display interface