linux-kernel - Re: [PATCH] x86: avoid unnecessary low zone allocation in AMD IOMMU's alloc

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Message-Id: <20080911223647D.fujita.tomonori@lab.ntt.co.jp>
Date:	Thu, 11 Sep 2008 22:36:59 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	joerg.roedel@....com
Cc:	fujita.tomonori@....ntt.co.jp, joro@...tes.org,
	linux-kernel@...r.kernel.org, mingo@...e.hu
Subject: Re: [PATCH] x86: avoid unnecessary low zone allocation in AMD
 IOMMU's alloc_coherent

On Thu, 11 Sep 2008 11:10:00 +0200
Joerg Roedel <joerg.roedel@....com> wrote:

> On Wed, Sep 10, 2008 at 11:45:34PM +0900, FUJITA Tomonori wrote:
> > On Wed, 10 Sep 2008 16:38:18 +0200
> > Joerg Roedel <joro@...tes.org> wrote:
> > > Ok, thats a valid point. I queue your patch with the AMD IOMMU updates
> > > for 2.6.28. Thanks.
> > 
> > Ingo already has queued it his tree, I think.
> 
> I asked Ingo to remove it from his tree to avoid merge conflicts with
> updates I am currently preparing. Here is the patch I queued into my
> 2.6.28 update chain.
> 
> Joerg
> 
> ===
> commit 42a7fa8d8a7f1680cba76e4824dba30bfd1c9d70
> Author: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> Date:   Wed Sep 10 20:19:40 2008 +0900
> 
>     x86: avoid unnecessary low zone allocation in AMD IOMMU's alloc_coherent
>     
>     x86's common alloc_coherent (dma_alloc_coherent in dma-mapping.h) sets
>     up the gfp flag according to the device dma_mask but AMD IOMMU doesn't
>     need it for devices that the IOMMU can do virtual mappings for. This
>     patch avoids unnecessary low zone allocation.
>     
>     Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
>     Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> 
> diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
> index ae38b24..09261dc 100644
> --- a/arch/x86/kernel/amd_iommu.c
> +++ b/arch/x86/kernel/amd_iommu.c

I see, thanks.
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