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

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Date:	Mon, 15 Nov 2010 23:31:29 +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 Fri, Nov 12, 2010 at 06:00:22PM +0000, Catalin Marinas wrote:
> This patch moves page table definitions from asm/page.h, asm/pgtable.h
> and asm/ptgable-hwdef.h into corresponding *-2level* files.

This also introduces pteval_t.  It would be useful to have the
introduction of pteval_t as a separate patch, which not only
introduces the typedef, but also makes use of it.

> +#ifndef _ASM_PGTABLE_2LEVEL_TYPES_H
> +#define _ASM_PGTABLE_2LEVEL_TYPES_H
> +
> +#undef STRICT_MM_TYPECHECKS
> +
> +typedef unsigned long pteval_t;
> +
> +#ifdef STRICT_MM_TYPECHECKS
> +/*
> + * These are used to make use of C type-checking..
> + */
> +typedef struct { unsigned long pte; } pte_t;

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.  shared_pte_mask also needs to be pteval_t.

As far as the __p*_error() functions, these should probably be passed
the pte/pmd/pgd value itself, rather than first passing them through
__pte_val() et.al.

Of couse, I now have patches for this and my other points... will sort
them out into a series in the next few days.
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