linux-kernel - [PATCH] samples: mbochs: add DMA_SHARED

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Date:   Wed, 30 May 2018 23:37:31 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Gerd Hoffmann <kraxel@...hat.com>,
        Alex Williamson <alex.williamson@...hat.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] 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: 8021194eb3da ("sample: vfio bochs vbe display (host device for bochs-drm)")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 samples/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/samples/Kconfig b/samples/Kconfig
index 3aeaaca77831..bd133efc1a56 100644
--- 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
-- 
2.9.0