linux-kernel - Re: [patch 5/6] ps3: BD/DVD/CD-ROM Storage Driver

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Date:	Sat, 14 Jul 2007 09:12:08 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linuxppc-dev@...abs.org,
	James Bottomley <James.Bottomley@...eleye.com>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Alessandro Rubini <rubini@...ion.unipv.it>,
	Paul Mackerras <paulus@...ba.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
Subject: Re: [patch 5/6] ps3: BD/DVD/CD-ROM Storage Driver

On Fri, 2007-07-13 at 16:19 +0200, Arnd Bergmann wrote:
> I'm pretty sure that no ppc64 machine needs alias resolution in the kernel,
> although some are VIPT. Last time we discussed this, Segher explained it
> to me, but I don't remember which way Cell does it. IIRC, it automatically
> flushes cache lines that are accessed through aliases. 

Ah yes, I remember reading about this automatic flushing thing. I don't
know how the caches actually work on most of our PPC's, but the fact is,
we don't have aliasing issues, so I can safely ignore it for a bit
longer :-)

There are some aliasing issues with the instruction cache specifically
on some 4xx models but that's irrelevant to this discussion (and I think
we handle them elsewhere anyway).

Ben.


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