linux-kernel - Re: [PATCH] x86: fix PAE pmd

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Message-ID: <20080508161925.GH12654@escobedo.amd.com>
Date:	Thu, 8 May 2008 18:19:25 +0200
From:	Hans Rosenfeld <hans.rosenfeld@....com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
Cc:	Hugh Dickins <hugh@...itas.com>, Ingo Molnar <mingo@...e.hu>,
	Jeff Chua <jeff.chua.linux@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Gabriel C <nix.or.die@...glemail.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Nishanth Aravamudan <nacc@...ibm.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] x86: fix PAE pmd_bad bootup warning

On Thu, May 08, 2008 at 08:51:22AM -0700, Dave Hansen wrote:
> Is there anything in your dmesg?

mm/memory.c:127: bad pmd ffff810076801040(80000000720000e7).

> There was a discussion on LKML in the last couple of days about
> pmd_bad() triggering on huge pages.  Perhaps we're clearing the mapping
> with the pmd_none_or_clear_bad(), and *THAT* is leaking the page.

That makes sense. I remember that explicitly munmapping the huge page
would still work, but it doesn't. I don't quite remember what I did back
then to test this, but I probably made some mistake there that led me to
some false conclusions.


-- 
%SYSTEM-F-ANARCHISM, The operating system has been overthrown

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