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

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Message-Id: <20081217115217G.fujita.tomonori@lab.ntt.co.jp>
Date:	Wed, 17 Dec 2008 11:51:26 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	jeremy@...p.org
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org,
	xen-devel@...ts.xensource.com, x86@...nel.org,
	ian.campbell@...rix.com, jbeulich@...ell.com
Subject: Re: [PATCH 04 of 14] swiotlb: consistently use
 address_needs_mapping	everywhere

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."
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