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

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Message-ID: <20101123173319.GA26510@n2100.arm.linux.org.uk>
Date:	Tue, 23 Nov 2010 17:33:19 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Catalin Marinas <catalin.marinas@....com>
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, 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.
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