linux-kernel - Re: [PATCH] drm: mediatek: remove IOMMU

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Date:	Wed, 11 May 2016 22:15:20 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	airlied@...hat.com, David Airlie <airlied@...ux.ie>,
	Bibby Hsieh <bibby.hsieh@...iatek.com>,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	Mao Huang <littlecvr@...omium.org>,
	YT Shen <yt.shen@...iatek.com>, CK Hu <ck.hu@...iatek.com>,
	linux-mediatek@...ts.infradead.org,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Matthias Brugger <matthias.bgg@...il.com>
Subject: Re: [PATCH] drm: mediatek: remove IOMMU_DMA select

On Wednesday 11 May 2016 22:11:07 Arnd Bergmann wrote:
> We get a harmless build warning when trying to use the mediatek
> DRM driver with IOMMU support disabled:
> 
> warning: (DRM_MEDIATEK) selects IOMMU_DMA which has unmet direct dependencies (IOMMU_SUPPORT)
> 
> However, the IOMMU_DMA symbol is not meant to be used by drivers
> at all, and this driver doesn't seem to have a strict dependency
> on it other than using the mediatek IOMMU driver that does.
> 
> Since we also want to be able to do compile tests with the
> driver on other platforms, the IOMMU_DMA symbol should not
> be selected here.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> If someone has a better explanation about why the 'select' is here,
> let me know, it certainly seems out of place.

Sorry, I didn't mean to send this as a reply to "More build fixes for
omapdrm in current -next", I copied the wrong command line.

I'll resend it if necessary.

	Arnd