linux-kernel - Re: [PATCH] agp: iommu_gfx_mapped only available if CONFIG_INTEL

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Date:	Tue, 1 Nov 2011 15:36:06 +0000
From:	Dave Airlie <airlied@...il.com>
To:	Keith Packard <keithp@...thp.com>
Cc:	Dave Airlie <airlied@...hat.com>, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
	Ben Widawsky <ben@...dawsk.net>
Subject: Re: [PATCH] agp: iommu_gfx_mapped only available if
 CONFIG_INTEL_IOMMU is set

On Fri, Oct 28, 2011 at 6:56 PM, Keith Packard <keithp@...thp.com> wrote:
> Kernels with no iommu support cannot ever need the Ironlake
> work-around, so never enable it in that case.
>
> Might be better to completely remove the work-around from the kernel
> in this case?
>

While I'm not offended by this patch, I am offended by the

extern int intel_iommu_gfx_mapped;

introduced in the previous patches, I dislike having extern
declarations in a C file, a header file is the place for that sort of
thing.

Also have a look around some other places that do CONFIG_ stuff, I
think there may be examples of both in which case this approach is
fine, but I do remember there being a fair few,

#ifdef CONFIG_BLAH
function
#else
#define function do while(0)
#endif

Dave.
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