linux-kernel - Re: [PATCH 1/5] dma: create dma_generic_alloc/free

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Message-Id: <20091027104526V.fujita.tomonori@lab.ntt.co.jp>
Date:	Tue, 27 Oct 2009 10:47:02 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	alex.williamson@...com
Cc:	dwmw2@...radead.org, linux-pci@...r.kernel.org,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] dma: create dma_generic_alloc/free_coherent()

On Mon, 26 Oct 2009 17:24:58 -0600
Alex Williamson <alex.williamson@...com> wrote:

> Move dma_generic_alloc_coherent() out of x86 code and create
> corresponding dma_generic_free_coherent() for symmetry.  These
> can then be used by IOMMU drivers attempting to implement
> passthrough mode.
> 
> Signed-off-by: Alex Williamson <alex.williamson@...com>
> ---
> 
>  arch/x86/include/asm/dma-mapping.h |    3 --
>  arch/x86/kernel/pci-dma.c          |   31 -------------------------
>  arch/x86/kernel/pci-nommu.c        |   10 +++++++-
>  include/linux/dma-mapping.h        |   44 ++++++++++++++++++++++++++++++++++++
>  4 files changed, 52 insertions(+), 36 deletions(-)

dma_generic_alloc_coherent() is x86 specific; other sane architectures
don't need such GFP_ hack. So moving it to the generic place is not a
good idea.
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