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Date: Mon, 03 Mar 2008 09:58:03 -0800
From: Jeremy Fitzhardinge <jeremy@...p.org>
To: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
CC: "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Andi Kleen <ak@...e.de>, Zachary Amsden <zach@...are.com>
Subject: Re: bad paravirt/Xen interaction in "x86 - Enhance DEBUG_RODATA support
- alternatives"
Mathieu Desnoyers wrote:
> I think kmap_atomic is only implemented on x86_32 and only deals with
> highmem pages. It will simply return the original page address without
> changing the protection for other pages, which is not what we want.
> Would ioremap() be a good alternative ?
>
Perhaps, though that's uncached by default. You could reserve a fixmap
slot and use set_fixmap to create the mapping. Or use vmap, which may
make dealing with instructions crossing page boundaries a little easier.
J
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