linux-kernel - Re: [PATCH] x86: create array based interface to change page attribute

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Date:	Tue, 01 Apr 2008 13:58:42 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Thomas Hellström <thomas@...gstengraphics.com>
CC:	Andi Kleen <andi@...stfloor.org>, Dave Airlie <airlied@...hat.com>,
	linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com
Subject: Re: [PATCH] x86: create array based interface to change page attribute

Thomas Hellström wrote:
> Given this problem, the previously mentioned use-case, and the fact that 
> we mostly really use user-space mappings,
> Is there a possibility we could add the following functions to Dave's 
> patch (provided they would work as intended, of course, namely 
> invalidate / bring back the kernel mapping).

sadly there are multiple mappings, both in theory and practice.
Especially the _np / _p functions specifically work on only the mapping you specify.

For this to work we would need to somehow make a "mark all mappings NP, but please only do the kernel ones" kind of thing.
The semantics of that are... lets say messy at best.
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