linux-kernel - Re: [PATCH 04 of 14] swiotlb: consistently use address_needs

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Date:	Wed, 17 Dec 2008 16:43:38 +0000
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	jeremy@...p.org, mingo@...e.hu, linux-kernel@...r.kernel.org,
	xen-devel@...ts.xensource.com, x86@...nel.org, jbeulich@...ell.com
Subject: Re: [PATCH 04 of 14] swiotlb: consistently use
	address_needs_mapping	everywhere

On Wed, 2008-12-17 at 11:51 +0900, FUJITA Tomonori wrote:
> On Wed, 17 Dec 2008 11:48:41 +0900
> FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> wrote:
> 
> > On Tue, 16 Dec 2008 12:17:28 -0800
> > Jeremy Fitzhardinge <jeremy@...p.org> wrote:
> > 
> > > Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
> > > ---
> > >  lib/swiotlb.c |   10 +++-------
> > >  1 file changed, 3 insertions(+), 7 deletions(-)
> > 
> > This patch is wrong.
> > 
> > dma_mask and coherent_dma_mask represent different restrictions.
> > 
> > You can't use coherent_dma_mask for alloc_coherent.
> 
> Oops, "you can't use dma_mask for alloc_coherent."

You are right, I completely overlooked that it was coherent_dma_mask in
one place and just dma_mask in the other, sorry for the noise.

Ian.


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