linux-kernel - Re: [PATCH] iommu/omap: Fix build error with !IOMMU

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Date:	Sun, 18 Sep 2011 02:02:22 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	linux-omap@...r.kernel.org, "Ohad Ben-Cohen" <ohad@...ery.com>,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu/omap: Fix build error with !IOMMU_SUPPORT

Hi Joerg,

On Wednesday 14 September 2011 16:07:39 Joerg Roedel wrote:
> Without this patch it is possible to select the VIDEO_OMAP3
> driver which then selects OMAP_IOVMM. But the omap iommu
> driver is not compiled without IOMMU_SUPPORT enabled. Fix
> that by forcing OMAP_IOMMU and OMAP_IOVMM are enabled before
> VIDEO_OMAP3 can be selected.

What about making VIDEO_OMAP3 select IOMMU_SUPPORT instead then ? Your patch 
would make the OMAP3 ISP driver disappear from the menu until IOMMU_SUPPORT 
gets turned on, which can confuse users.

> Cc: Ohad Ben-Cohen <ohad@...ery.com>
> Cc: iommu@...ts.linux-foundation.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> ---
>  drivers/iommu/Kconfig       |    4 ++--
>  drivers/media/video/Kconfig |    3 +--
>  2 files changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
> index d901930..ae46776 100644
> --- a/drivers/iommu/Kconfig
> +++ b/drivers/iommu/Kconfig
> @@ -114,8 +114,8 @@ config OMAP_IOMMU
>  	select IOMMU_API
> 
>  config OMAP_IOVMM
> -	tristate
> -	select OMAP_IOMMU
> +	tristate "OMAP IO Virtual Memory Manager Support"
> +	depends on OMAP_IOMMU
> 
>  config OMAP_IOMMU_DEBUG
>         tristate "Export OMAP IOMMU/IOVMM internals in DebugFS"
> diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
> index 6a25fad..6201069 100644
> --- a/drivers/media/video/Kconfig
> +++ b/drivers/media/video/Kconfig
> @@ -763,8 +763,7 @@ source "drivers/media/video/m5mols/Kconfig"
> 
>  config VIDEO_OMAP3
>  	tristate "OMAP 3 Camera support (EXPERIMENTAL)"
> -	select OMAP_IOVMM
> -	depends on VIDEO_V4L2 && I2C && VIDEO_V4L2_SUBDEV_API && ARCH_OMAP3 &&
> EXPERIMENTAL
> +	depends on OMAP_IOVMM && VIDEO_V4L2 && I2C && VIDEO_V4L2_SUBDEV_API &&
> ARCH_OMAP3 && EXPERIMENTAL
> ---help---
>  	  Driver for an OMAP 3 camera controller.

-- 
Regards,

Laurent Pinchart
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