linux-kernel - Re: [PATCH v4 08/19] ARM: LPAE: Introduce the 3-level page table format definitions

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Date:	Mon, 21 Mar 2011 13:19:07 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Nick Piggin <npiggin@...il.com>
Subject: Re: [PATCH v4 08/19] ARM: LPAE: Introduce the 3-level page table
 format definitions

On 21 March 2011 12:56, Russell King - ARM Linux <linux@....linux.org.uk> wrote:
> On Mon, Mar 21, 2011 at 12:36:55PM +0000, Catalin Marinas wrote:
>> Any plans for the nopmd patches? I haven't seen them in -next or on the list.
>
> I dropped them again because of those pesky warnings, so again I'm not
> planning to push them this window as I don't wish to be deluged in
> people reporting the warnings.
>
> They really need fixing once we know how the LPAE stuff interacts with
> the change.  At the moment I've no idea whether the existing section
> support ends up at pgd or pmd level with LPAE.

With LPAE, the section should be at the pmd level (2nd level page
table) as the PGDIR_SHIFT is 30. But if we standardise on using the
pmd in both cases, macros like pmd_val() would expand to the right
level with classic page tables (it goes up to pgd_val).

PMD_SHIFT also gets defined as PGDIR_SHIFT for the classic page
tables. One of my patches in the series converts the existing code to
PMD_SHIFT from PGDIR_SHIFT.

I'm happy to give this a try if you have some existing patches for the
classic page tables (I can even start from scratch but I don't want to
duplicate work).

-- 
Catalin
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