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

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Message-ID: <alpine.LFD.0.999.0709211204050.16478@woody.linux-foundation.org>
Date:	Fri, 21 Sep 2007 12:05:11 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Christoph Lameter <clameter@....com>
cc:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	akpm@...ux-foundation.org, ak@...e.de,
	linux-kernel@...r.kernel.org, tony.luck@...el.com,
	asit.k.mallick@...el.com
Subject: Re: x86_64: potential critical issue with quicklists and page table
 pages



On Fri, 21 Sep 2007, Linus Torvalds wrote:
> 
> On Fri, 21 Sep 2007, Christoph Lameter wrote:
> > 
> > The quicklists collect pages while we gather pages for TLB flushing. 
> > These pages must be kept until the actual TLB flush has occurred. The 
> > optimization of releasing off node pages early is therefore not valid.
> 
> That should be the "mmu_gather" structure, not the quicklists.

Oh, and I see what's wrong: you not only switched "free_page()" to 
"quicklist_free()", you *also* switched "tlb_remove_page()" to 
"quicklist_free()".

Ok, that commit is totally and utterly broken. Will revert.

		Linus
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