linux-kernel - Re: [PATCH v2 02/20] ARM: LPAE: Factor out 2-level page table definitions into separate files

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Message-ID: <20101116095938.GA12891@n2100.arm.linux.org.uk>
Date:	Tue, 16 Nov 2010 09:59:38 +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 02/20] ARM: LPAE: Factor out 2-level page table
	definitions into separate files

On Tue, Nov 16, 2010 at 09:14:52AM +0000, Catalin Marinas wrote:
> On 15 November 2010 23:31, Russell King - ARM Linux
> <linux@....linux.org.uk> wrote:
> > This should become:
> >
> > typedef struct { pteval_t pte; } pte_t;
> >
> > L_PTE_* can then be declared using linux/const.h stuff to typedef them
> > to pteval_t.
> 
> I already do this for LPAE but can be done for the 2-level definitions
> for consistency.

No you don't.  You define the 2nd level definitions using pmd_t which
is _wrong_.  pmd_t is the type of the pmd container, not the pmd value.

> BTW, do you think it's worth adding STRICT_MM_TYPECHECKS for LPAE as
> well? It would probably spot some issues.

Definitely, because it'll throw out warnings for most of your _AT(pmd_t,)
definitions.
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