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

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Message-ID: <8bd0f97a0909132052k258eee3fsbb5041fa1d338602@mail.gmail.com>
Date:	Sun, 13 Sep 2009 23:52:23 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	David Howells <dhowells@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org,
	Bernd Schmidt <bernds_cb1@...nline.de>,
	Bryan Wu <cooloney@...nel.org>
Subject: Re: [PATCH v2] NOMMU: add support for Memory Protection Units (MPU)

On Tue, Jul 14, 2009 at 13:14, Mike Frysinger wrote:
> From: Bernd Schmidt <bernds_cb1@...nline.de>
>
> Some architectures (like the Blackfin arch) implement some of the
> "simpler" features that one would expect out of a MMU such as memory
> protection.  In our case, we actually get read/write/exec protection
> down to the page boundary so processes can't stomp on each other let
> alone the kernel.  There is a performance decrease (which depends greatly
> on the workload) however as the hardware/software interaction was not
> optimized at design time.

David: anything else need to be done here or can we merge things ?
-mike
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