linux-kernel - Re: [RFC PATCH 06/12] PAT 64b: Add ioremap

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Message-ID: <20071214231911.GA99967@muc.de>
Date:	Sat, 15 Dec 2007 00:19:11 +0100
From:	Andi Kleen <ak@....de>
To:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Roland Dreier <rdreier@...co.com>,
	venkatesh.pallipadi@...el.com, torvalds@...ux-foundation.org,
	gregkh@...e.de, airlied@...net.ie, davej@...hat.com, mingo@...e.hu,
	tglx@...utronix.de, hpa@...or.com, akpm@...ux-foundation.org,
	arjan@...radead.org, jesse.barnes@...el.com,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 06/12] PAT 64b: Add ioremap_wc support

> For now, we don't track RAM pages using memattr infrastructure. This is because,
> memattr infrastructure is not enough. i.e., while the page is getting
> tracked using memattr infrastructure,

> potentially the page can get
> freed(a bug that we need to catch, to avoid attribute aliasing).

That would be a bug in the caller. But anybody who sets non standard
attributes should go through memattr first.

The only exception is /dev/mem -- not sure how to handle this best.
Perhaps only allow memattr for non memory for there. 

-Andi
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