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

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Date:	Tue, 11 May 2010 20:47:58 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Jamie Lokier <jamie@...reable.org>
Cc:	linux-kernel@...r.kernel.org, Nicolas Pitre <nico@...vell.com>,
	Saeed Bishara <saeed@...vell.com>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-ext4@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: Rampant ext3/4 corruption on 2.6.34-rc7 with VIVT ARM (Marvell
 88f5182)

On Tue, 2010-05-11 at 11:16 +0100, Jamie Lokier wrote:
> 
> I've seen similar ext3 corruption errors with an IDE on a Sigma
> Designs EM8620 with ARM core.  It's completely unrelated :-) But the
> fault was in the IDE driver doing cache flushes too late after
> starting to set up DMA.  To diagnose it, we luckily found a
> reproducible test case, then sprinkled full cache flushes at various
> places to narrow it down, and eventually found that one full cache
> flush in the driver itself sorted it out, which told us where the
> fault was.  From there it was easy. 

Ok, well, that's -a- possibility... we'll see. I'm doing some more tests
to try to characterize the problem a bit better, then we can play with
the driver. I think it's also worth trying with earlier kernels in case
it's some kind of regression, though that means I'll have to backport my
board support for that little box :-)

Cheers,
Ben.


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