linux-kernel - Re: [PATCH 00 of 10] x86: unify asm/pgtable.h

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Message-ID: <47841194.2010208@goop.org>
Date:	Tue, 08 Jan 2008 16:13:08 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	LKML <linux-kernel@...r.kernel.org>, Andi Kleen <ak@...e.de>,
	Glauber de Oliveira Costa <glommer@...il.com>,
	Jan Beulich <jbeulich@...ell.com>
Subject: Re: [PATCH 00 of 10] x86: unify asm/pgtable.h

Ingo Molnar wrote:
> * Ingo Molnar <mingo@...e.hu> wrote:
>
>   
>>  #define __PAGE_KERNEL_EXEC						\
>> -	(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
>> +	(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
>>     

This shouldn't be necessary.  The old 64-bit code defined everything 
without _PAGE_GLOBAL, but then used a MAKE_GLOBAL() macro to OR it in 
later.  This seemed a bit roundabout to me, so I just put it in from the 
outset.

> btw., __PAGE_KERNEL_EXEC should probably be _PAGE_GLOBAL - but it wasnt 
> before.
>   

You mean _PAGE_KERNEL_EXEC, which is assigned to the 32-bit 
__PAGE_KERNEL_EXEC variable?  It gets ORed in when it determines that 
the processor has the global capability.

If not, I'm not sure what you mean.

    J
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