linux-kernel - Re: [PATCH v2 04/20] ARM: LPAE: Do not assume Linux PTEs are always at PTRS_PER

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Message-ID: <AANLkTinej2U_tEWM25m7VW7=PndxVPohaKjJ=10wn+C1@mail.gmail.com>
Date:	Mon, 15 Nov 2010 21:46:14 +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
Subject: Re: [PATCH v2 04/20] ARM: LPAE: Do not assume Linux PTEs are always
 at PTRS_PER_PTE offset

On 15 November 2010 17:42, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> On Fri, Nov 12, 2010 at 06:00:24PM +0000, Catalin Marinas wrote:
>> Placing the Linux PTEs at a 2KB offset inside a page is a workaround for
>> the 2-level page table format where not enough spare bits are available.
>> With LPAE this is no longer required. This patch changes such assumption
>> by using a different macro, LINUX_PTE_OFFSET, which is defined to
>> PTRS_PER_PTE for the 2-level page tables.
>
> Hmm.  I think we should be doing this a different way - in fact, I think
> we should switch the order of the linux vs hardware page tables.  This
> actually simplifies the code a bit too - notice that we lose the arith.
> in __pte_map, __pte_unmap, pmd_page_vaddr, which is all page table
> walking stuff.

It looks like a good clean-up to me (though I need some refactoring on
my LPAE patches). Do you plan to push this upstream? If you add a
comment and a signed-off line, I can carry it in my LPAE branch until
it appears in mainline.

Thanks.

-- 
Catalin
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