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

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Message-ID: <Pine.LNX.4.64.0709241438220.31469@schroedinger.engr.sgi.com>
Date:	Mon, 24 Sep 2007 14:42:24 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"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 Tue, 25 Sep 2007, Benjamin Herrenschmidt wrote:

> I'd suggest just reverting the patch for now (well, I see from the
> commit list that you did just that) and I'll try to come up with
> something better.

That would be great. Note that the reversal of the x86_64 quicklist 
support patch does not address the issue that is (as pointed out by 
Siddha) in core code and not in x86_64 arch dode. The fix that I posted 
fixes the core issue.

> Christoph, I'd be happy if you didn't start butchering mmu_gather just
> right now since I'm doing just that and it will collide all over the
> place :-) Or if you want something specific done, please throw
> ideas/patches at me and I'll integrate that in my serie.

Any "butchering" was done for 2.6.22. 2.6.23 only added arch support for 
x86_64 since Andi forgot to merge it for .22. I'd be glad if you could 
look into this and make quicklists interoperate nicely withh mmu gather.
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