linux-kernel - Re: [GIT PULL] x86/uapi for 3.8

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Message-ID: <50CD0C0F.4070107@zytor.com>
Date:	Sat, 15 Dec 2012 15:47:27 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Dave Jones <davej@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	Jan Beulich <jbeulich@...e.com>,
	Matt Fleming <matt.fleming@...el.com>,
	David Howells <dhowells@...hat.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Arnd Bergmann <arnd@...db.de>, Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [GIT PULL] x86/uapi for 3.8

On 12/15/2012 01:37 PM, Dave Jones wrote:
> On Sat, Dec 15, 2012 at 11:58:00AM -0800, Linus Torvalds wrote:
>
>   > It might also be that it causes some massive corruption at boot time,
>   > but it then requires that that particular memory is actually used. So
>   > maybe it's not so much about the memory map except indirectly.
>
> I wonder if this might explain the XFS corruption I've been seeing
> the last couple days.  Won't be able to get at the affected laptop
> until Monday to find out..
>

It seems somewhat unlikely, but not implausible, since the trampoline 
page table is only in use for very brief moments and usually not very 
often at all, but if it is just completely screwed and we do fandango on 
memory... yes we could have problems.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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