Subject: [PATCH] drm/nouveau/platform: add IOMMU dependency

From: [email-masked] (Alexandre Courbot)
Date: Wed, 20 May 2015 09:33:46 +0900

On 05/19/2015 09:53 PM, Arnd Bergmann wrote:
> The recently added iommu code in the nouveau driver fails to build
> when the IOMMU support is disabled:
>
> drivers/gpu/drm/nouveau/nouveau_platform.c: In function 'nouveau_platform_probe_iommu':
> drivers/gpu/drm/nouveau/nouveau_platform.c:113:41: error: 'const struct iommu_ops' has no mem
>
> To avoid the build error, this now adds an explicit dependency on the
> IOMMU implementation.

I have a local patch to nouveau_platform.c that only calls the IOMMU 
functions if CONFIG_IOMMU is set. Wouldn't this be more suitable as 
IOMMU support is only used by Tegra and thus not beneficial for desktop 
GPUs?