linux-kernel - Re: [PATCH 4/4] x86: unify asm-x86/pgtable*.h

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Date:	Tue, 11 Dec 2007 09:29:11 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Glauber de Oliveira Costa <glommer@...il.com>
Subject: Re: [PATCH 4/4] x86: unify asm-x86/pgtable*.h


* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> All x86 modes and architectures have very similar pagetable 
> structures: the page flags, the accessors for testing/setting them, 
> and the combinations of page flags used for kernel and usermode 
> mappings are all the same.  The main difference is between 32 and 
> 64-bit pagetable entries, with the latter supporting the NX bit.
> 
> The most significant difference between the modes/architectures is the 
> number of levels in the pagetable (4 for 64-bit, 3 for 32-bit/PAE, 2 
> for non-PAE 32-bit).  This accounts for the remaining code in the 
> various mode-specific headers.
> 
> I've tried to avoid changing formatting as much as possible, so that 
> the code motion is more obvious.  A subsequent patch will clean things 
> up in place.

when applied to x86.git#mm this patch has build problems:

include/asm/pgtable.h: In function 'pte_modify':
include/asm/pgtable.h:246: error: 'pteval_t' undeclared (first use in this function)
include/asm/pgtable.h:246: error: (Each undeclared identifier is reported only once
include/asm/pgtable.h:246: error: for each function it appears in.)
include/asm/pgtable.h:246: error: expected ';' before 'pte'
include/asm/pgtable.h:247: error: 'pte' undeclared (first use in this function)

config attached.

	Ingo

View attachment "config" of type "text/plain" (72612 bytes)