linux-kernel - Re: [PATCH 6/6] atmel

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Message-Id: <200801231452.55388.marc.pignat@hevs.ch>
Date:	Wed, 23 Jan 2008 14:52:55 +0100
From:	Marc Pignat <marc.pignat@...s.ch>
To:	Haavard Skinnemoen <hskinnemoen@...el.com>
Cc:	Andrew Victor <linux@...im.org.za>, kernel@...32linux.org,
	linux-kernel@...r.kernel.org, Remy Bohmer <linux@...mer.net>,
	Chip Coldwell <coldwell@...hat.com>
Subject: Re: [PATCH 6/6] atmel_serial: Add DMA support

On Wednesday 23 January 2008, Haavard Skinnemoen wrote:
> On Wed, 23 Jan 2008 14:18:38 +0100
...
> GFP_DMA doesn't have anything to do with alignment, AFAIK.
I don't even know if it does something for at91 or avr32, but there is a flag
for dma memory, so we should use it.

...
> No, please don't. If you're thinking of dma_alloc_coherent(), it means
> that the cache will be bypassed when accessing the buffer (slower), and
> that the size will be rounded up to the next multiple of the page size
> (larger). If the sole purpose of doing that is to get properly aligned
> buffers, we might as well use the page allocator directly.
ok.

Marc


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