linux-kernel - Re: [PATCH] drm/nouveau/platform: fix compilation if !CONFIG

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Date:	Wed, 20 May 2015 14:01:25 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Thierry Reding <treding@...dia.com>,
	Alexandre Courbot <acourbot@...dia.com>, gnurou@...il.com,
	David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, Ben Skeggs <bskeggs@...hat.com>
Subject: Re: [PATCH] drm/nouveau/platform: fix compilation if !CONFIG_IOMMU

On Wednesday 20 May 2015 13:32:33 Thierry Reding wrote:
> 
> Since these are all static functions, perhaps an "if (IS_ENABLED(...))"
> would work here? That way you'd get compile coverage of the code in all
> cases.

I had the same thought at first.
 
> But perhaps that doesn't work for IOMMU. I have a vague memory of
> running across something like this before and IOMMU has this quirk of
> defining struct iommu_ops as empty if IOMMU_API is deselected so you'll
> probably get compiler errors unless you actually preprocess the code
> out.

Exactly.

	Arnd
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