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Date: Mon, 03 Mar 2008 09:58:10 -0800
From: "H. Peter Anvin" <hpa@...or.com>
To: Ingo Molnar <mingo@...e.hu>
CC: Nish Aravamudan <nish.aravamudan@...il.com>,
Arjan van de Ven <arjan@...ux.intel.com>,
torvalds@...ux-foundation.org, hans.rosenfeld@....com,
linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: bisected boot regression post 2.6.25-rc3.. please revert
Ingo Molnar wrote:
> * Nish Aravamudan <nish.aravamudan@...il.com> wrote:
>
>>> in any case, the commit has to be reverted as it clearly isnt a NOP
>>> on your box as it was intended to be. (it should only have made a
>>> difference in a rare hugetlbfs case)
>> On x86/{,_64}, _PAGE_PSE and _PAGE_PROTNONE are the same bit. Would
>> that have any effect here? We encountered that collision when adding
>> mprotect() support for hugepages.
>
> well, this is the PMD, and PROTNONE is a pte property.
The PSE bit in the PTE becomes the PATX bit. It shouldn't ever be set
in Linux.
-hpa
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