linux-kernel - Re: __supported_pte_mask breaks PROT

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Date:	Thu, 5 Feb 2009 15:29:12 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	William Lee Irwin III <wli@...omorphy.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>
Subject: Re: __supported_pte_mask breaks PROT_NONE pages


* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> On an x86 system which doesn't support global mappings,  
> __supported_pte_mask has _PAGE_GLOBAL clear, to make sure it never  
> appears in the PTE.  pfn_pte() and so on will enforce it with:

btw., did you actually see a boot crash due to this, on a pre-PGE system?

	Ingo
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