linux-kernel - Re: Linux 2.6.30-rc8 [also: VIA Support]

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Message-ID: <20090605073018.GH6411@prithivi.gnumonks.org>
Date:	Fri, 5 Jun 2009 09:30:18 +0200
From:	Harald Welte <HaraldWelte@...tech.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	"Michael S. Zick" <lkml@...ethan.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Duane Griffin <duaneg@...da.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.30-rc8 [also: VIA Support]

On Thu, Jun 04, 2009 at 10:16:35PM +0200, Andi Kleen wrote:
> Harald Welte <HaraldWelte@...tech.com> writes:
> >
> > why would it matter on UP? as indicated, I'm not the expert here, but I thought
> > memory ordering issues only arise in SMP systems [or possibly with regard to
> > DMA, but as we already explored much earlier in this thread, drivers that access
> > DMA buffers whil the hardware owns them are buggy and need to be fixed]
> 
> Sorry we didn't establish that. Accessing data structures that are
> also accessed by DMA hardware is pretty common in fact and memory
> ordering issues also come up regularly (e.g. all the infamous PCI
> posting bugs)
> 
> What we established is that the drivers don't use LOCK for it
> (or at least we think that's very unlikely)

Yes, sorry for not mentioning that.  I was implicitly thinking of "not using an
appropriate locking method"

-- 
- Harald Welte <HaraldWelte@...tech.com>	    http://linux.via.com.tw/
============================================================================
VIA Free and Open Source Software Liaison
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