linux-kernel - Re: [PATCH -mm] Revoke core code: fix nommu arch compiling error bug

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Message-ID: <8bd0f97a0703270020m67821b90gb9d1cdfd6262887b@mail.gmail.com>
Date:	Tue, 27 Mar 2007 03:20:33 -0400
From:	"Mike Frysinger" <vapier.adi@...il.com>
To:	"Pekka J Enberg" <penberg@...helsinki.fi>
Cc:	"Wu, Bryan" <bryan.wu@...log.com>,
	"David Howells" <dhowells@...hat.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, "Hugh Dickins" <hugh@...itas.com>,
	"Alan Cox" <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH -mm] Revoke core code: fix nommu arch compiling error bug

On 3/27/07, Pekka J Enberg <penberg@...helsinki.fi> wrote:
> On Tue, 27 Mar 2007, Wu, Bryan wrote:
> > Agree. MPU of Blackfin can provide some processes protection. But maybe
> > at this moment just disable revoke for NOMMU is easier for further
> > development. When we provide the MPU stuff, maybe we can enable the
> > revoke for NOMMU but MPU arch.
>
> Yeah, MPU should be sufficient for revoke(). Note that mmap() and mummap()
> suffers from the same problem on NOMMU so perhaps we really should do
> CONFIG_MPU.

we would need both ... MPU gives us the ability to restrict access,
but we'd still be unable to do fun things like COW
-mike
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