linux-kernel - [PATCH v3 2/4] break kconfig dependency loop

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Message-Id: <1432300312-24792-3-git-send-email-kraxel@redhat.com>
Date:	Fri, 22 May 2015 15:11:50 +0200
From:	Gerd Hoffmann <kraxel@...hat.com>
To:	dri-devel@...ts.freedesktop.org
Cc:	airlied@...hat.com, mst@...hat.com,
	Gerd Hoffmann <kraxel@...hat.com>,
	Joerg Roedel <joro@...tes.org>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	iommu@...ts.linux-foundation.org (open list:IOMMU DRIVERS),
	linux-kernel@...r.kernel.org (open list),
	linux-media@...r.kernel.org (open list:MEDIA INPUT INFRA...)
Subject: [PATCH v3 2/4] break kconfig dependency loop

After adding virtio-gpu I get this funky kconfig dependency loop.

scripts/kconfig/conf --oldconfig Kconfig
drivers/video/fbdev/Kconfig:5:error: recursive dependency detected!
drivers/video/fbdev/Kconfig:5:  symbol FB is selected by DRM_KMS_FB_HELPER
drivers/gpu/drm/Kconfig:34:     symbol DRM_KMS_FB_HELPER is selected by DRM_VIRTIO_GPU
drivers/gpu/drm/virtio/Kconfig:1:       symbol DRM_VIRTIO_GPU depends on VIRTIO
drivers/virtio/Kconfig:1:       symbol VIRTIO is selected by REMOTEPROC
drivers/remoteproc/Kconfig:4:   symbol REMOTEPROC is selected by OMAP_REMOTEPROC
drivers/remoteproc/Kconfig:12:  symbol OMAP_REMOTEPROC depends on OMAP_IOMMU
drivers/iommu/Kconfig:141:      symbol OMAP_IOMMU is selected by VIDEO_OMAP3
drivers/media/platform/Kconfig:96:      symbol VIDEO_OMAP3 depends on VIDEO_V4L2
drivers/media/v4l2-core/Kconfig:6:      symbol VIDEO_V4L2 depends on I2C
drivers/i2c/Kconfig:7:  symbol I2C is selected by FB_DDC
drivers/video/fbdev/Kconfig:59: symbol FB_DDC is selected by FB_CYBER2000_DDC
drivers/video/fbdev/Kconfig:374:        symbol FB_CYBER2000_DDC depends on FB_CYBER2000
drivers/video/fbdev/Kconfig:362:        symbol FB_CYBER2000 depends on FB

Making VIDEO_OMAP3 depend on OMAP_IOMMU instead of selecting it breaks the
loop, which looks like the best way to handle it to me.  Updated OMAP_IOMMU
help text accordingly.

Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
Acked-by: Mauro Carvalho Chehab <mchehab@....samsung.com>
---
 drivers/iommu/Kconfig          | 3 +++
 drivers/media/platform/Kconfig | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index 1ae4e54..a5c8d5e 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -178,6 +178,9 @@ config OMAP_IOMMU
 	depends on ARM && MMU
 	depends on ARCH_OMAP2PLUS || COMPILE_TEST
 	select IOMMU_API
+	---help---
+	  The OMAP3 media platform drivers depend on iommu support,
+	  if you need them say Y here.

 config OMAP_IOMMU_DEBUG
 	bool "Export OMAP IOMMU internals in DebugFS"
diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
index 421f531..19306f72 100644
--- a/drivers/media/platform/Kconfig
+++ b/drivers/media/platform/Kconfig
@@ -87,8 +87,8 @@ config VIDEO_OMAP3
 	tristate "OMAP 3 Camera support"
 	depends on VIDEO_V4L2 && I2C && VIDEO_V4L2_SUBDEV_API && ARCH_OMAP3
 	depends on HAS_DMA
+	depends on OMAP_IOMMU
 	select ARM_DMA_USE_IOMMU
-	select OMAP_IOMMU
 	select VIDEOBUF2_DMA_CONTIG
 	select MFD_SYSCON
 	---help---
-- 
1.8.3.1

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