linux-ext4 - Re: Rampant ext3/4 corruption on 2.6.34-rc7 with VIVT ARM (Marvell 88f5182)

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Date:	Fri, 14 May 2010 18:59:27 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Jamie Lokier <jamie@...reable.org>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Saeed Bishara <saeed@...vell.com>,
	Nicolas Pitre <nico@...vell.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	"Shilimkar, Santosh" <santosh.shilimkar@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: Rampant ext3/4 corruption on 2.6.34-rc7 with VIVT ARM (Marvell
	88f5182)

On Fri, May 14, 2010 at 06:41:53PM +0100, Jamie Lokier wrote:
> Russell King - ARM Linux wrote:
> > On Thu, May 13, 2010 at 08:47:11AM +1000, Benjamin Herrenschmidt wrote:
> > > Now, in the case at hand, which is my ARM based NAS, I believe this
> > > is non cache-coherent and thus uses cache flush ops. I don't know ARM
> > > well enough but I would expect these to be implicit barriers. Russell ?
> > > Nico ?
> > 
> > ARMv5 doesn't have a weak memory ordering model, and doesn't have any
> > memory barrier instructions.
> 
> It does have buffered writes, doesn't it?  Are they always flushed by
> the cache flush ops?

Surprisingly, for DMA it's something we've always done.  Odd that.
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