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

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Date:	Wed, 20 May 2015 23:18:51 +0900
From:	Alexandre Courbot <gnurou@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Thierry Reding <treding@...dia.com>,
	Alexandre Courbot <acourbot@...dia.com>,
	David Airlie <airlied@...ux.ie>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	Ben Skeggs <bskeggs@...hat.com>
Subject: Re: [PATCH] drm/nouveau/platform: fix compilation if !CONFIG_IOMMU

On Wed, May 20, 2015 at 9:01 PM, Arnd Bergmann <arnd@...db.de> wrote:
> 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.

That's precisely the issue here, so not covering this code is exactly
what we want if !CONFIG_IOMMU.
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