linux-kernel - Re: [patch] x86: fix page attribute corruption with cpa()

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Message-ID: <20090121112530.GD23469@elte.hu>
Date:	Wed, 21 Jan 2009 12:25:30 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	hpa@...or.com, tglx@...utronix.de, torvalds@...ux-foundation.org,
	yinghai@...nel.org, venkatesh.pallipadi@...el.com,
	akpm@...ux-foundation.org, arjan@...radead.org,
	linux-kernel@...r.kernel.org, jaswinderlinux@...il.com,
	just.for.lkml@...glemail.com, npiggin@...e.de
Subject: Re: [patch] x86: fix page attribute corruption with cpa()


* Suresh Siddha <suresh.b.siddha@...el.com> wrote:

> This patch fixes a performance issue reported by Linus on his Nehalem 
> system. While Linus reverted the PAT patch (commit 
> 58dab916dfb57328d50deb0aa9b3fc92efa248ff) which exposed the issue, 
> existing cpa() code can potentially still cause wrong(page attribute 
> corruption) behavior.
> 
> This patch also fixes the "WARNING: at arch/x86/mm/pageattr.c:560" that 
> various people reported.

nice fix - applied to tip/x86/urgent, thanks Suresh!

	Ingo
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