linux-kernel - Re: [PATCH] Fix preemptible lazy mode bug

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Message-Id: <200709060641.36855.ak@suse.de>
Date:	Thu, 6 Sep 2007 06:41:36 +0100
From:	Andi Kleen <ak@...e.de>
To:	Zachary Amsden <zach@...are.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Linus Torvalds <torvalds@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Chris Wright <chrisw@...s-sol.org>, stable@...nel.org,
	Virtualization Mailing List <virtualization@...ts.osdl.org>
Subject: Re: [PATCH] Fix preemptible lazy mode bug

>I agree.  The patch is a nop.  I just got overly paranoid.  The whole
>thing is just very prone to bugs.
So do we need a patch for .23 or not?

>; it does
> seem perfectly acceptable though for the mm code to use kmap or vmap
> (not kmap_atomic) internally somewhere in the pagetable code.

i386 does it all the time for highmem pagetables in fact.

-Andi
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