linux-kernel - Re: 2.6.19 file content corruption on ext3

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Message-ID: <20061228213625.GE20596@flint.arm.linux.org.uk>
Date:	Thu, 28 Dec 2006 21:36:25 +0000
From:	Russell King <rmk+lkml@....linux.org.uk>
To:	Linus Torvalds <torvalds@...l.org>
Cc:	Marc Haber <mh+linux-kernel@...schlus.de>,
	Andrew Morton <akpm@...l.org>,
	Nick Piggin <nickpiggin@...oo.com.au>, andrei.popa@...eo.ro,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Hugh Dickins <hugh@...itas.com>,
	Florian Weimer <fw@...eb.enyo.de>,
	Martin Michlmayr <tbm@...ius.com>
Subject: Re: 2.6.19 file content corruption on ext3

On Thu, Dec 28, 2006 at 01:24:30PM -0800, Linus Torvalds wrote:
> On Thu, 28 Dec 2006, Linus Torvalds wrote:
> > 
> > What we need now is actually looking at the source code, and people who 
> > understand the VM, I'm afraid. I'm gathering traces now that I have a good 
> > test-case. I'll post my trace tools once I've tested that they work, in 
> > case others want to help.
> 
> Ok, I've got the traces, but quite frankly, I doubt anybody is crazy 
> enough to want to trawl through them. It's a bit painful, since we're 
> talking thousands of pages to trigger this problem.
> 
> Also, I've used the PG_arch_1 flag, which is fine on x86[-64] and probably 
> ARM, but is used for other things on ia64, powerpc and sparc64. But here's 
> the patch in case anybody cares.

PG_arch_1 is used on ARM to flag pages that need a dcache flush prior to
hitting userspace, in the same way that sparc64 uses it.  So ARM systems
should not have this patch applied.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:
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