linux-kernel - Re: [bg-linux] [PATCH 5/7] [RFC] force 32-byte aligned kmallocs

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Date:	Fri, 20 May 2011 12:13:30 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Kazutomo Yoshii <kazutomo.yoshii@...il.com>
Cc:	Eric Van Hensbergen <ericvh@...il.com>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	bg-linux@...ts.anl-external.org
Subject: Re: [bg-linux] [PATCH 5/7] [RFC] force 32-byte aligned kmallocs

On Fri, 2011-05-20 at 12:08 +1000, Benjamin Herrenschmidt wrote:
> On Thu, 2011-05-19 at 20:32 -0500, Kazutomo Yoshii wrote:
> > 
> > Actually DMA sends invalidate requests to the snoop unit(L2 level).
> > BGP SoC is a bit different from other 4xx base. 
> 
> Well, some other 44x also have a snooping L2 (more or less), but L1 is
> usually the problem.

Hrm... looking at the doco you pointed me to, it looks like the L1 -is-
coherent, it gets snoop kills from the L2.

Ok so we do need to make this non-coherent cache stuff a runtime option
(well, we need that for 440+476 too anyways so may as well do it now).

As for the alignment of kmalloc, it looks like a hack that should be
done in the torus code itself.

Cheers,
Ben.

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