Message-ID: <4C19ECF8.1090600@goop.org>
Date: Thu, 17 Jun 2010 10:38:00 +0100
From: Jeremy Fitzhardinge <jeremy@goop.org>
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To: "H. Peter Anvin" <hpa@zytor.com>
CC: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>,
       Matthew Wilcox <matthew@wil.cx>, tglx@linutronix.de, mingo@redhat.com,
       linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
       macro@linux-mips.org, kamezawa.hiroyu@jp.fujitsu.com,
       eike-kernel@sf-tec.de
Subject: Re: [PATCH 1/2] x86: ioremap: fix wrong physical address handling
References: <4C197A49.6020400@jp.fujitsu.com> <4C197A9E.5040509@jp.fujitsu.com> <20100617025052.GH9298@parisc-linux.org> <4C19A2EE.2010203@zytor.com> <4C19AABA.8000706@jp.fujitsu.com> <4C19BA9A.4010300@zytor.com> <4C19EC57.3000409@goop.org>
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On 06/17/2010 10:35 AM, Jeremy Fitzhardinge wrote:
> I guess it would be possible to special-case ioremap to allow the
> creation of such mappings, but I don't know what kind of system-wide
> fallout would happen as a result.  The consequences of something trying
> to extract a pfn from one of those ptes would be
>   

...very bad, as it would result in truncated pfns and likely cause some
kind of corruption.

(oops, sent too early)

    J
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