linux-kernel - Re: [PATCH] Intel IOMMU Pass Through Support

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Message-Id: <20090430170034.1f8f8047.akpm@linux-foundation.org>
Date:	Thu, 30 Apr 2009 17:00:34 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Randy Dunlap <rdunlap@...otime.net>
Cc:	fenghua.yu@...el.com, dwmw2@...radead.org, mingo@...e.hu,
	torvalds@...ux-foundation.org, weidong.han@...el.com,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: Re: [PATCH] Intel IOMMU Pass Through Support

On Thu, 30 Apr 2009 16:37:52 -0700
Randy Dunlap <rdunlap@...otime.net> wrote:

> > 
> > arch/x86/built-in.o: In function `iommu_setup':
> > arch/x86/kernel/pci-dma.c:215: undefined reference to `iommu_pass_through'
> > arch/x86/built-in.o: In function `pci_swiotlb_init':
> > arch/x86/kernel/pci-swiotlb.c:74: undefined reference to `iommu_pass_through'
> > 
> > Because iommu_pass_through is defined in drivers/pci/intel-iommu.c and
> > 
> > # CONFIG_DMAR is not set
> > 
> > I'll need to cook up some local hack to work around that.
> > 
> 
> Patch just went to linux-next mailing list (but should have also
> gone to lkml):
> 
> http://marc.info/?l=linux-next&m=124113213400748&w=2

OK, thanks.  My linux-next feed seems to have broken.

That patch modifies 

	arch/ia64/kernel/dma-mapping.c
	arch/x86/kernel/pci-dma.c

but it would be more logical to modify

	arch/ia64/kernel/pci-dma.c
	arch/x86/kernel/pci-dma.c

is there a reason why that cannot be done?
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