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

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Message-ID: <20080508165111.GI12654@escobedo.amd.com>
Date:	Thu, 8 May 2008 18:51:11 +0200
From:	Hans Rosenfeld <hans.rosenfeld@....com>
To:	Nishanth Aravamudan <nacc@...ibm.com>
Cc:	Dave Hansen <dave@...ux.vnet.ibm.com>,
	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>,
	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 09:33:52AM -0700, Nishanth Aravamudan wrote:
> So this seems to lend credence to Dave's hypothesis. Without, as you
> were trying before, teaching pagemap all about hugepages, what are our
> options?
> 
> Can we just skip over the current iteration of the PMD loop (would we
> need something similar for the PTE loop for power?) if pmd_huge(pmd)?

Allowing huge pages in the page walker would affect both walk_pmd_range
and walk_pud_range. Then either the users of the page walker need to
know how to handle huge pages themselves (in the pmd_entry and pud_entry
callback functions), or the page walker treats huge pages as any other
pages (calling the pte_entry callback function).


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

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