linux-kernel - Re: [PATCH] iommu: provide of_xlate pointer unconditionally

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Date:	Tue, 5 Apr 2016 13:25:36 +0200
From:	Joerg Roedel <jroedel@...e.de>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Yong Wu <yong.wu@...iatek.com>,
	Robin Murphy <robin.murphy@....com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Will Deacon <will.deacon@....com>,
	Magnus Damm <damm+renesas@...nsource.se>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] iommu: provide of_xlate pointer unconditionally

On Tue, Mar 15, 2016 at 10:37:17PM +0100, Arnd Bergmann wrote:
> iommu drivers that support the standard DT bindings use a of_xlate
> callback pointer, but that is only part of struct iommu_ops when
> CONFIG_OF_IOMMU is enabled, leading to build errors in randconfig
> builds when that is not provided:
> 
> drivers/iommu/mtk_iommu.c:497:2: error: unknown field 'of_xlate' specified in initializer
>   .of_xlate = mtk_iommu_of_xlate,
>   ^
> drivers/iommu/mtk_iommu.c:497:14: error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types]
>   .of_xlate = mtk_iommu_of_xlate,
>               ^~~~~~~~~~~~~~~~~~
> drivers/iommu/mtk_iommu.c:497:14: note: (near initialization for 'mtk_iommu_ops.domain_get_attr')
> 
> We can work around it by adding more #ifdefs in each driver, but
> it seems nicer to just allow setting the pointer even if it is
> unused. This makes the driver code look nicer, and it gives better
> compile-time coverage when test building on other architectures.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: 0df4fabe208d ("iommu/mediatek: Add mt8173 IOMMU driver")

Applied to iommu/fixes, thanks Arnd.