linux-kernel - Re: [GIT PULL] various IOMMU updates for 2.6.29

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Date:	Sun, 4 Jan 2009 11:30:16 +0100
From:	Joerg Roedel <joerg.roedel@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Joerg Roedel <joro@...tes.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>, gregkh@...e.de,
	avi@...hat.com, mingo@...hat.com, dwmw2@...radead.org,
	weidong.han@...el.com, linux-kernel@...r.kernel.org,
	iommu@...ts.linux-foundation.org
Subject: Re: [GIT PULL] various IOMMU updates for 2.6.29

On Sun, Jan 04, 2009 at 11:05:11AM +0100, Ingo Molnar wrote:
> See the patch below - i have queued it up in tip/core/urgent.
> 
> 	Ingo
> 
> ----------------------------->
> From c66b9906f863696159e05890bb7123269bb9a9de Mon Sep 17 00:00:00 2001
> From: Ingo Molnar <mingo@...e.hu>
> Date: Sun, 4 Jan 2009 10:55:02 +0100
> Subject: [PATCH] intel-iommu: fix build error with INTR_REMAP=y and DMAR=n
> 
> dmar.o can be built in the CONFIG_INTR_REMAP=y case but
> iommu_calculate_agaw() is only available if VT-d is built as well.
> 
> So create an inline version of iommu_calculate_agaw() for the
> !CONFIG_DMAR case. The iommu->agaw value wont be used in this
> case, but the code is cleaner (has less #ifdefs) if we have it around
> unconditionally.
> 
> Signed-off-by: Ingo Molnar <mingo@...e.hu>
> ---
>  include/linux/dma_remapping.h |    8 ++++++++
>  1 files changed, 8 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/dma_remapping.h b/include/linux/dma_remapping.h
> index 136f170..af1dab4 100644
> --- a/include/linux/dma_remapping.h
> +++ b/include/linux/dma_remapping.h
> @@ -17,7 +17,15 @@ struct dmar_domain;
>  struct root_entry;
>  
>  extern void free_dmar_iommu(struct intel_iommu *iommu);
> +
> +#ifdef CONFIG_DMAR
>  extern int iommu_calculate_agaw(struct intel_iommu *iommu);
> +#else
> +static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
> +{
> +	return 0;
> +}
> +#endif
>  
>  extern int dmar_disabled;

Yeah, thats indeed better. Thanks.

Joerg

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