From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pekka Enberg <penberg@cs.helsinki.fi>
Subject: Re: [PATCH v3] ad7877: keep dma rx buffers in seperate cache lines
Date: Tue, 11 May 2010 23:38:11 +0300
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To: Mike Frysinger <vapier.adi@gmail.com>
Cc: Christoph Lameter <cl@linux.com>, Matt Mackall <mpm@selenic.com>, Dmitry Torokhov <dmitry.torokhov@gmail.com>, Andrew Morton <akpm@linux-foundation.org>, Oskar Schirmer <os@emlix.com>, Michael Hennerich <Michael.Hennerich@analog.com>, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, =?UTF-8?B?RGFuaWVsIEdsw7Zja25lcg==?= <dg@emlix.com>, Oliver Schneidewind <osw@emlix.com>, Johannes Weiner <jw@emlix.com>, Nick Piggin <npiggin@suse.de>, David Rientjes <rientjes@google.com>, David Brownell <dbrownell@users.sourceforge.net>, Grant Likely <grant.likely@secretlab.ca>

Mike Frysinger wrote:
> that is a question for David/Grant.  i'm not the SPI core maintainer,
> i'm merely watching over some SPI drivers.  however, this answer also
> doesnt sound like it's thinking big enough because what you're
> proposing isnt specific to the SPI bus -- any time a DMA safe buffer
> is needed dynamically, this function could be used.

Well, we have dma_alloc_coherent(), shouldn't you be using that instead?