linux-kernel - Re: Folding _PAGE_PWT into _PAGE_PCD (was Re: unify pagetable accessors patch causes double fault II)

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Message-ID: <20080115173902.GB2665@one.firstfloor.org>
Date:	Tue, 15 Jan 2008 18:39:02 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
	tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: Folding _PAGE_PWT into _PAGE_PCD (was Re: unify pagetable accessors patch causes double fault II)

> Good, but isn't the name _PAGE_CACHE misleading?  Or does it mean 

It's all bits related to caching.

> something else in the context of PAT?

It could mean arbitary things with PAT -- PAT essentially allows to
reprogram these bits freely to various different modi using a mapping table.   
In the default configuration any bit set should resort in a uncacheable mode 
though.

-Andi
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