linux-kernel - Re: [PATCH v2] NOMMU: add support for Memory Protection Units (MPU)

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Message-ID: <12377.1247654255@redhat.com>
Date:	Wed, 15 Jul 2009 11:37:35 +0100
From:	David Howells <dhowells@...hat.com>
To:	Bernd Schmidt <bernds_cb1@...nline.de>
Cc:	dhowells@...hat.com, Mike Frysinger <vapier@...too.org>,
	linux-kernel@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org,
	Bryan Wu <cooloney@...nel.org>
Subject: Re: [PATCH v2] NOMMU: add support for Memory Protection Units (MPU)

Bernd Schmidt <bernds_cb1@...nline.de> wrote:

> No page table, just three bitmaps (r/w/x), with one bit per page, per mm.

I presume that all you do is maintain a distinction between
userspace-accessible areas and kernel-only areas, and don't prevent userspace
processes from destroying each other.

David
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