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Date: Tue, 11 May 2010 21:59:29 +0300
From: Pekka Enberg <penberg@cs.helsinki.fi>
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To: Dmitry Torokhov <dmitry.torokhov@gmail.com>
CC: Mike Frysinger <vapier.adi@gmail.com>,
       Andrew Morton <akpm@linux-foundation.org>,
       Oskar Schirmer <os@emlix.com>,
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       "=?ISO-8859-1?Q?Daniel_Gl=F6ckner?=" <dg@emlix.com>,
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       Christoph Lameter <cl@linux-foundation.org>,
       Nick Piggin <npiggin@suse.de>, David Rientjes <rientjes@google.com>,
       Matt Mackall <mpm@selenic.com>
Subject: Re: [PATCH v3] ad7877: keep dma rx buffers in seperate cache lines
References: <1273487642-2169-1-git-send-email-os@emlix.com> <1273488154-2993-1-git-send-email-os@emlix.com> <20100510142225.4bf215ef.akpm@linux-foundation.org> <20100511060547.GA9644@core.coreip.homeip.net> <AANLkTikA9s6lpO2uDuIup8BwGOYYHQ9yQxS36PBSIttX@mail.gmail.com> <20100511062110.GB9644@core.coreip.homeip.net> <AANLkTiktu7N5IXknkkJ9D5L4z5plhuGvD45IVqJm9zG1@mail.gmail.com> <20100511063309.GC9644@core.coreip.homeip.net> <y2k84144f021005102342m18bce930g53599c9112565f78@mail.gmail.com> <20100511165228.GC7396@core.coreip.homeip.net>
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Dmitry Torokhov wrote:
> The architectures that we are trying to deal with here should be forcing
> kmalloc to the cache boundary already though - otherwise they would not
> be able to used kmalloced memory for DMA buffers at all. Or am I utterly
> lost here?

I don't know which architecture you're talking about but it's not true 
in general and you probably don't want to depend on it even if it 
happens to work now.