linux-kernel - Re: [PATCH v2 08/20] ARM: LPAE: MMU setup for the 3-level page table format

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Message-ID: <1290533729.6381.128.camel@e102109-lin.cambridge.arm.com>
Date:	Tue, 23 Nov 2010 17:35:29 +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 08/20] ARM: LPAE: MMU setup for the 3-level page
 table format

On Tue, 2010-11-23 at 17:33 +0000, Russell King - ARM Linux wrote:
> On Tue, Nov 23, 2010 at 11:38:15AM +0000, Catalin Marinas wrote:
> > On 22 November 2010 13:10, Russell King - ARM Linux
> > <linux@....linux.org.uk> wrote:
> > > Are you sure these shifts by 18 places are correct?  They're actually
> > > (val >> SECTION_SHIFT) << 2, so maybe they should be (SECTION_SHIFT -
> > > PMD_WORDS) ?
> >
> > SECTION_SHIFT - PMD_ORDER is (20 - 2) for classic page tables and (21
> > - 3) for LPAE. But we could change the 18 to some macros for
> > clarification (the line would be long though).
> 
> So yes, it's SECTION_SHIFT - PMD_ORDER, which is how they should be
> used IMHO.  I don't see why another macro would be necessary.

I didn't mean adding another macro but using (SECTION_SHIFT - PMD_ORDER)
on a long line.

-- 
Catalin


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