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

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Message-ID: <20090121132036.GU24891@wotan.suse.de>
Date:	Wed, 21 Jan 2009 14:20:36 +0100
From:	Nick Piggin <npiggin@...e.de>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	mingo@...e.hu, 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
Subject: Re: [patch] x86: fix page attribute corruption with cpa()

On Tue, Jan 20, 2009 at 02:20:21PM -0800, Suresh B 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.

This doesn't seem to show up any more after running the system for
some time, so I think it's fixed here. Thanks!

> 
> ---
> From: Suresh Siddha <suresh.b.siddha@...el.com>
> Subject: x86: fix page attribute corruption with cpa()

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