linux-kernel - RE: x86_64: potential critical issue with quicklists and page table pages

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Message-ID: <617E1C2C70743745A92448908E030B2A027C22D4@scsmsx411.amr.corp.intel.com>
Date:	Fri, 21 Sep 2007 12:59:20 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	"Christoph Lameter" <clameter@....com>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>
Cc:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	<akpm@...ux-foundation.org>, <ak@...e.de>,
	<linux-kernel@...r.kernel.org>,
	"Mallick, Asit K" <asit.k.mallick@...el.com>
Subject: RE: x86_64: potential critical issue with quicklists and page table pages

> The quicklists have a long history and this bug has therefore also been in 
> IA64 for a long time and it also likely exists on sparc64, sh and sh64. We 
> need the patch that I posted to fix the other platforms. And with this fix 
> there would be nothing amiss on x86_64 either.

IA64 doesn't do a pgd>pud>pmd>pte table walk in h/w.  The VHPT leaps
straight to the pte page (through the virtual mapping of the VHPT). So
this wasn't a problem for IA64.

-Tony
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