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From: Hugh Dickins <hugh@veritas.com>
To: Valdis.Kletnieks@vt.edu
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
	Andi Kleen <ak@suse.de>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH mm] stop c_p_a corrupting the pds
Date: Wed, 6 Feb 2008 04:49:49 +0000 (GMT)	[thread overview]
Message-ID: <Pine.LNX.4.64.0802060428050.9030@blonde.site> (raw)
In-Reply-To: <26590.1202263535@turing-police.cc.vt.edu>

On Tue, 5 Feb 2008, Valdis.Kletnieks@vt.edu wrote:
> On Tue, 05 Feb 2008 22:27:21 GMT, Hugh Dickins said:
> > When change_page_attr splits a large page on x86_32 (without PAE), it is
> > currently corrupting every process's page directory: fix that by removing
> > the thinko which passes down a physical instead of a virtual address -
> > this version of the patch being the hotfix for 2.6.24-mm1.
> > 
> > Signed-off-by: Hugh Dickins <hugh@veritas.com>
> 
> <snark>
> I *knew* there was a reason we should have had this patch series in -mm for a while.
> </snark>
> 
> :)

Seriously, I do agree with you on that.  It seems like the excitement
of making great changes has overtaken proper caution here.

Though I guess it was just coincidence that made it more debuggable
in my -mm kernel (which gave "bad pgd" errors after starting X), when
the -git kernel just crashed somehow in starting X.  And I was lucky
to have CONFIG_VMSPLIT_2G_OPT on that machine, which placed the
corruption somewhere that soon got noticed.

Hugh

  reply	other threads:[~2008-02-06  4:50 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-05 22:26 [PATCH] " Hugh Dickins
2008-02-05 22:27 ` [PATCH mm] " Hugh Dickins
2008-02-06  2:05   ` Valdis.Kletnieks
2008-02-06  4:49     ` Hugh Dickins [this message]
2008-02-06  8:26 ` [PATCH] " Ingo Molnar

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