linux-kernel - Re: File corruption when using kernels 2.6.18+

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Message-ID: <4703E287.3070705@romig.demon.co.uk>
Date:	Wed, 03 Oct 2007 19:42:15 +0100
From:	Neil Romig <neil@...ig.demon.co.uk>
To:	Pekka Enberg <penberg@...helsinki.fi>
CC:	linux-kernel@...r.kernel.org, hyoshiok@...aclelinux.com
Subject: Re: File corruption when using kernels 2.6.18+

Pekka Enberg wrote:
> Hi Neil,
> 
> On 10/3/07, Neil Romig <neil@...ig.demon.co.uk> wrote:
>> Thanks for your help on this. I have narrowed it down to commit
>> "c22ce143d15eb288543fe9873e1c5ac1c01b69a1 x86: cache pollution aware
>> __copy_from_user_ll()". This fits with the errors I'm getting, so now I need
>> to find out if I can safely ignore this patch, or does it have to be modified?
>> This is my first Linux bug in many years of simply using it, so I'm a little
>> nervous!
> 
> Just to make sure, if you disable CONFIG_X86_INTEL_USERCOPY, the
> corruption goes away?
> 
It took some fiddling to disable (edit arch/i386/Kconfig.cpu) but that has fixed it. Many thanks!

Does this need to be reported as a bug? Or should the kernel config scripts be changed to enable this option to be easily turned off?

Neil.
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